Electromagnetic Flowmeters Communication Modules SITRANS F M MAG 8000 Modbus RTU Operating Instructions • 08/2011
SITRANS F
SITRANS F Communication Modules SITRANS F M MAG 8000 Modbus RTU
Introduction
1
Safety notes
2
Hardware Installation
3
Connecting
4
System integration
5
Function codes
6
Technical data
7
Modbus holding registers
A
Appendix
B
Operating Instructions
Add-on module for use with flowmeter types SITRANS F M MAG 8000
08/2011 A5E03409989-01
Legal information Warning notice system This manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert symbol, notices referring only to property damage have no safety alert symbol. These notices shown below are graded according to the degree of danger. DANGER indicates that death or severe personal injury will result if proper precautions are not taken. WARNING indicates that death or severe personal injury may result if proper precautions are not taken. CAUTION with a safety alert symbol, indicates that minor personal injury can result if proper precautions are not taken. CAUTION without a safety alert symbol, indicates that property damage can result if proper precautions are not taken. NOTICE indicates that an unintended result or situation can occur if the relevant information is not taken into account. If more than one degree of danger is present, the warning notice representing the highest degree of danger will be used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to property damage.
Qualified Personnel The product/system described in this documentation may be operated only by personnel qualified for the specific task in accordance with the relevant documentation, in particular its warning notices and safety instructions. Qualified personnel are those who, based on their training and experience, are capable of identifying risks and avoiding potential hazards when working with these products/systems.
Proper use of Siemens products Note the following: WARNING Siemens products may only be used for the applications described in the catalog and in the relevant technical documentation. If products and components from other manufacturers are used, these must be recommended or approved by Siemens. Proper transport, storage, installation, assembly, commissioning, operation and maintenance are required to ensure that the products operate safely and without any problems. The permissible ambient conditions must be complied with. The information in the relevant documentation must be observed.
Trademarks All names identified by ® are registered trademarks of Siemens AG. The remaining trademarks in this publication may be trademarks whose use by third parties for their own purposes could violate the rights of the owner.
Disclaimer of Liability We have reviewed the contents of this publication to ensure consistency with the hardware and software described. Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the information in this publication is reviewed regularly and any necessary corrections are included in subsequent editions.
Siemens AG Industry Sector Postfach 48 48 90026 NÜRNBERG GERMANY
Order number: A5E03409989 Ⓟ 08/2011
Copyright © Siemens AG 2011. Technical data subject to change
Table of contents 1
2
Introduction................................................................................................................................................ 5 1.1
Document history ...........................................................................................................................5
1.2
Modbus RTU technology ...............................................................................................................6
1.3
Further Information ........................................................................................................................8
Safety notes............................................................................................................................................... 9 2.1
Installation in hazardous area ........................................................................................................9
3
Hardware Installation ............................................................................................................................... 11
4
Connecting .............................................................................................................................................. 13
5
6
7
4.1
Wiring ...........................................................................................................................................13
4.2
Closing the device........................................................................................................................15
System integration ................................................................................................................................... 17 5.1
System integration instructions ....................................................................................................17
5.2
Function check .............................................................................................................................17
5.3
Communication parameter settings .............................................................................................18
5.4
Parameter access ........................................................................................................................18
5.5 5.5.1 5.5.2 5.5.3 5.5.4 5.5.5 5.5.6
Commissioning with PDM ............................................................................................................19 General instructions .....................................................................................................................19 Commissioning steps...................................................................................................................19 Installing EDD files.......................................................................................................................20 Adding device to network.............................................................................................................21 Configuring the device .................................................................................................................22 Operation .....................................................................................................................................24
Function codes ........................................................................................................................................ 25 6.1
Modbus Commands.....................................................................................................................25
6.2
Read coils ....................................................................................................................................26
6.3
Read multiple registers ................................................................................................................28
6.4
Write single coil ............................................................................................................................30
6.5
Write multiple registers ................................................................................................................31
6.6
Report slave ID command ...........................................................................................................34
6.7
Exception handling.......................................................................................................................35
Technical data ......................................................................................................................................... 37
SITRANS F M MAG 8000 Modbus RTU Operating Instructions, 08/2011, A5E03409989-01
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Table of contents
A
B
Modbus holding registers......................................................................................................................... 39 A.1
Introduction to holding registers.................................................................................................. 39
A.2
MODBUS application settings..................................................................................................... 40
A.3
MODBUS driver settings ............................................................................................................. 41
A.4
Menu control ............................................................................................................................... 42
A.5
Sensor characteristics................................................................................................................. 43
A.6
Totalization .................................................................................................................................. 45
A.7
Pulse output ................................................................................................................................ 45
A.8
Service control ............................................................................................................................ 47
A.9
Error messages........................................................................................................................... 47
A.10
Power control .............................................................................................................................. 53
A.11
Consumption statistic .................................................................................................................. 55
A.12
Consumption profile .................................................................................................................... 56
A.13
Leakage statistic ......................................................................................................................... 57
A.14
Datalog ........................................................................................................................................ 59
A.15
Consumption readings ................................................................................................................ 68
Appendix.................................................................................................................................................. 69 B.1
Data type mapping ...................................................................................................................... 69
B.2
CRC calculation .......................................................................................................................... 70
Glossary .................................................................................................................................................. 75 Index........................................................................................................................................................ 77
SITRANS F M MAG 8000 Modbus RTU
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1
Introduction
Purpose The Operating Instructions provide all information necessary for the installation and use of the Modbus RTU add-on module (FDK:087L4212 or FDK:087L4213), intended for use with the electromagnetic transmitter type SITRANS F M MAG 8000. NOTICE Reduced battery lifetime The Modbus RTU communication module is designed for use with mains powered device versions only. Use of the Modbus RTU communication module with battery-powered device versions will reduce the expected battery lifetime significantly.
Basic knowledge required The instructions are not intended to be a complete tutorial on the Modbus RTU protocol, and it is assumed the end user already has a general working knowledge of Modbus RTU communication, especially in respect of master station configuration and operation. However an overview is included in the following section to explain some fundamental aspects of the protocol.
See also For more information about SITRANS F M transmitters and sensors, please refer to the appropriate Operating Instructions available on the flowdocumentation homepage (http://www.siemens.com/flowdocumentation) or on the SITRANS F literature CD-ROM.
1.1
Document history The contents of these instructions are regularly reviewed and corrections are included in subsequent editions. We welcome all suggestions for improvement. The following table shows the most important changes in the documentation compared to each previous edition. Edition
Remarks
12/2010
1. edition
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Introduction 1.2 Modbus RTU technology
1.2
Modbus RTU technology Modbus RTU is an open, serial (RS-232 or RS-485) protocol based on master/slave or client/server architecture. The protocol interconnects field equipment such as sensors, actuators, and controllers and is widely used in both process and manufacturing automation. The fieldbus environment is the base level group of digital networks in the hierarchy of plant networks.
Features The SITRANS F Modbus RTU Communication modules comply with the Modbus Serial Line Protocol. Among other things this implies a Master-Slave protocol at level 2 of the OSI model. A node (the master) issues explicit commands to one of the slave nodes and processes responses. Slave nodes will not transmit data without a request from the master node, and do not communicate with other slaves. Modbus is a mono Master system, which means that only one Master can be connected at the time.
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Introduction 1.2 Modbus RTU technology
Communication modes Two modes of communication are possible, Unicast and Broadcast.
res
po
8
● In unicast mode the Master sends a request to a specific Slave device, and waits a specified time for a response.
ns
e
Master
req
ue
st
Slave
Figure 1-1
Slave
Slave
Unicast Mode
req
ues
8
● In Broadcast mode the master sends out a request to address "0", which means that the information is for all Slave devices on the network. In Broadcast mode there is no response from the Slave devices.
t
Master
Slave
Figure 1-2
Slave
Slave
Broadcast Mode
Modbus Frame The Modbus frame is shown below, and is valid for both requests and responses. Table 1- 1
Modbus Frame
SLAVE ADDRESS
FUNCTION MODE
DATA
CRC
1 Byte
1 Byte
0 ... 252 Bytes
2 Bytes
SITRANS F M MAG 8000 Modbus RTU Operating Instructions, 08/2011, A5E03409989-01
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Introduction 1.3 Further Information
References For further information, please refer to the following specification and guidelines available at the Modbus Organisation (http://www.modbus.org/) Website 1. Serial Line Specification & Implementation guide v. 1.0 2. Application Protocol Specification v. 1.1
1.3
Further Information The contents of these operating instructions shall not become part of or modify any prior or existing agreement, commitment or legal relationship. All obligations on the part of Siemens AG are contained in the respective sales contract which also contains the complete and solely applicable warranty conditions. Any statements contained herein do not create new warranties or modify the existing warranty.
Product information on the Internet The Operating Instructions are available on the CD-ROM shipped with the device, and on the Internet on the Siemens homepage, where further information on the range of SITRANS F flowmeters may also be found: Product information on the internet (http://www.siemens.com/flow)
Worldwide contact person If you need more information or have particular problems not covered sufficiently by the operating instructions, please get in touch with your contact person. You can find contact information for your local contact person on the Internet: Local contact person (http://www.automation.siemens.com/partner)
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Safety notes
CAUTION Correct, reliable operation of the product requires proper transport, storage, positioning and assembly as well as careful operation and maintenance. Only qualified personnel should install or operate this instrument. Note Alterations to the product, including opening or improper repairs of the product, are not permitted. If this requirement is not observed, the CE mark and the manufacturer's warranty will expire.
2.1
Installation in hazardous area WARNING NOT allowed for use in hazardous areas! Equipment used in hazardous areas must be Ex-approved and marked accordingly! This device is NOT approved for use in hazardous areas!
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Safety notes 2.1 Installation in hazardous area
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Hardware Installation
3
The installation procedure for an add-on module to a MAG 8000 transmitter is as follows: 1. Loosen screws on transmitter top. 2. Remove transmitter top using a screwdriver. 3. Dispose of silica gel bag. 4. Mount the modules on the backside of the MAG 8000 electronics.
Figure 3-1
Hardware installation
5. Use the two supplied 3mm screws and washers to fix the module to the MAG 8000 electronics.
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Hardware Installation
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Connecting
Note Shielding Always shield a Modbus over Serial Line Cable. At one end of each cable its shield must be connected to protective ground. If a connector is used at this end, the shell of the connector is connected to the shield of the cable. Note Cable specifications A RS485-Modbus must use a balanced pair (for D0-D1) and a third wire (for the Common). For the balanced pairs used in an RS485-system, a Characteristic Impedance with a value between 100 and 120 Ohms must be used.
4.1
Wiring ● Connect shield to MAG 8000 enclosure using the cable clamp
Figure 4-1
Cable shield connection
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Connecting 4.1 Wiring
RS232 connection diagram
① ② ③
Common
①
Common
Connect shield to enclosure Shield connected to protective ground
RS485 connection diagram
① ② ③
Common Connect shield to enclosure Shield connected to protective ground
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Connecting 4.2 Closing the device
① ②
Common Termination
Bus termination All RS485-based networks must be terminated correctly to function properly. A termination must be placed at each end of segment. The Modbus RTU module can add a 120 ohm termination if a jumper is placed beside terminals in position "ON". ● Termination is set to "ON" from factory.
4.2
Closing the device 1. Replace O-ring to ensure continued IP68 enclosure rating. – Check O-ring for damage or deformity. – Smear O-ring with acid-free lubricating gel. 2. Add new Silica gel bag – Remove plastic bag from new silica gel bag. – Place new silica gel bag on top of battery pack to prevent condensation within meter. – To maintain IP68 enclosure the silica gel bag may not be in contact with the Sylgard. 3. Mount top lid. 4. Fasten screws to reassemble meter completely. Note All sealed MAG 8000 CT meters have to be re-verified when sealings (marked "A") have been broken.
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Connecting 4.2 Closing the device
NOTICE Loss of degree of protection Damage to device if the enclosure is open or not properly closed. The degree of protection specified on the nameplate or in "Technical data" is no longer guaranteed. • Make sure that the device is securely closed.
See also Technical data (Page 37)
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System integration 5.1
5
System integration instructions This chapter provides information on how to integrate the flowmeter in a Modbus RTU automation and control system. The chapter shows the necessary steps in order to put the system into operation. After finishing the steps, the system is ready to go into normal operation in the Modbus RTU automation control system. Note Storage location All Modbus settings of the transmitter are stored in the transmitter in a non-volatile memory.
Device name and address The transmitter is shipped with a default device name and serial number. All devices are shipped with a temporary address that allows the host to automatically commission the transmitter. The network address is the current device address used by the fieldbus. Note It is recommended NOT to use the default address in a multi-slave network. It is of great importance to ensure that no devices have the same address. Otherwise an abnormal behaviour of the whole serial bus can occur, the master being unable to communicate with all present slaves on the bus.
5.2
Function check Before proceeding further, make sure that installation and connection have been performed successfully. ● See chapter "Hardware installation (Page 11)" for installation verification. ● See chapter "Connecting (Page 13)" for connection verification. When the function check has been successfully carried out, the device can be switched on.
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System integration 5.3 Communication parameter settings
5.3
Communication parameter settings
Effect of changing baudrate or framing Changing baudrate or framing has effect on the communication as follows: When changed from the Modbus master, the new settings only have effect after a reset (PowerUp) of the device– or after writing to the "ResetCommunication" coil. Table 5- 1
Communication parameters
Item
Value
Description
Device Communication Address
1-247
Device address [Factory setting: 1]
Baud rate
1200, 2400, 4800, 9600, 19200, 38400
Communication speed [Factory setting: 19200]
Parity
•
Even, 1 stop bit
Communication parameters
•
Odd, 1 stop bit
[Factory setting: Even, 1 stopbit ]
•
None, 2 stop bit
•
None, 1 stop bit
Interframe Space
35-255 chars
Response Delay
0-255 msec.
The minimum interframe space between two Modbus RTU messages in sequence (specified as 3.5 characters) is configurable. Range: 3.5 – 25 character times. Specified in bytes times ten. [Factory setting: 35 ] The minimum time from when a slave receives a request and until it returns a response. This makes it possible to send data to slow masters. [Factory setting: 5 ]
5.4
Parameter access
Write protection Writable parameters in the MAG 8000 are protected by a software password. Some parameters with influence on the accuracy or identity of the flowmeter are furthermore protected by a hardware lock. For information on how to unlock parameters protected by a hardware lock, refer to the MAG 8000 Operating Instructions.
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System integration 5.5 Commissioning with PDM
Parameter access When attempting to write a parameter without a password, MAG 8000 will return "Illegal data address" exception code. To successfully change a parameter, use the following routine: 1. Write the password to parameter "Meter Access Code" at address 2007. Default password is "1000" 2. Change the parameter. When the correct password has been entered, the flowmeter remains "unlocked" for 10 minutes after last communication. If a parameter is write-protected by a hardware lock, the MAG 8000 will return "Illegal data address".
5.5
Commissioning with PDM
5.5.1
General instructions SIMATIC PDM (Process Device Manager) is a software package for configuring, parameterizing, commissioning and maintaining devices (e.g. transducers) and for configuring networks and PCs. Among other features, SIMATIC PDM contains a simple process monitoring of process values, interrupts and status/diagnosis signals of device. Note For instructions on installation and operation of SIMATIC PDM, please refer to the SIMATIC PDM Getting Started
NOTICE Infrared communication Activated infrared communication blocks all communication with a wired Modbus master. • Ensure that no infrared communication is activated before communicating with the wired Modbus master.
5.5.2
Commissioning steps In the following it is described how to commission the device with SIMATIC PDM. The steps are divided into the following sections:
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System integration 5.5 Commissioning with PDM 1. Install the EDD files (Page 20) 2. Add the device to the communication network (Page 21) 3. Configure the device (Page 22). Describes the setup of the basic parameters of the flowmeter. 4. Operation (Page 24). Describes how to view all available process values.
5.5.3
Installing EDD files
Installing EDD files Procedure for installing PDM device driver consists of the following steps: ● Download update from the Internet on MAG 8000 Downloads (http://support.automation.siemens.com/WW/view/en/19701862/133100) , or copy it from supplied CD into envisaged folder and unzip file. It is recommended to check that the EDD is the version valid for the device. ● Open "Manage Device Catalog" from Start > SIMATIC > SIMATIC PDM. ● Navigate to PDM device driver, select device and click "OK" and driver is installed on PC.
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System integration 5.5 Commissioning with PDM
5.5.4
Adding device to network Before setting the parameters, it is necessary to configure the MAG 8000 project in PDM. 1. Add the device to SIMATIC Modbus network: – Select "File"->"New" Type in a project name, e.g. MAG 8000 – Right click on "Net" and select "Insert New Object"->"Modbus Net". Your PC is now added to the Modbus Net, e.g. NOG0482D – Right click on "Modbus Net" and select "Insert New Object"->"Modbus Device". – Click on "Assign" and assign the Modbus device to MAG8000 Advanced or Basic (Sensors->Flow->Electromagnetic->SIEMENS AG->MAG8000) and click "ok".
Figure 5-1
Assigning Modbus device to network
– Rename the device according to the application requirements (max. 32 characters). 2. Set up the communication parameters for SIMATIC Modbus network. – Select "Net"->"Modbus net", right click on "Modbus net" and select "Object Properties" – Select "Connection" and set "data transmission rate" to "19200 Baud" and "Vertical parity position" to "0 - even"
SITRANS F M MAG 8000 Modbus RTU Operating Instructions, 08/2011, A5E03409989-01
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System integration 5.5 Commissioning with PDM
Figure 5-2
5.5.5
MODBUS net Object properties
Configuring the device
Read all parameters Before any parameterization is done it is necessary to read all parameters from the device into the offline table of SIMATIC PDM. The offline table merely contains default data. 1. Open the PDM device driver. 2. Select "Device->Upload to PC/PG .." Select "Execute even if the device TAG does not match the project data TAG." and click "OK" to read all parameters to the offline table. After closing the dialog all loaded parameters should show "Loaded" in the status of the PDM table.
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System integration 5.5 Commissioning with PDM
Setting basic parameters In the following it is shown by example how to set the following basic flow parameters: ● Low flow cut-off ● Filter time constant
NOTICE Change of other parameters All parameters are described in chapter "holding registers (Page 39)". Change of parameters is always carried out as described in the following example
Download settings to device 1. Select: "Device->Download to device...". 2. Enter password (Default factory password is "1000").
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System integration 5.5 Commissioning with PDM
5.5.6
Operation The system is now ready for normal operation. 1. Select "View->Display" to see all process values. 2. Verify that the process values show the expected values.
Figure 5-3
View all process values
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Function codes 6.1
Modbus Commands
Modbus addressing model The module allows R/W access to the following standard Modbus data register blocks: ● Coils (ref. 0x address range) ● Holding Registers (ref. 4x address range) I.e. the module will not support the other standard data register blocks: ● "Discrete Input" (ref. 1x address range) ● "Input Registers"(ref. 3x address range)
Commands Broadcast communication from master to slave(s) through device address 0 is supported. No response from the slave is generated in that case. Broadcast communication is not secured by the normal check mechanisms and shall be limited to very few uses. A SITRANS F Modbus slave only recognizes (and accepts) few Modbus RTU commands/function codes. Supported function codes are listed in the table below. Table 6- 1
Function codes
Function code
Command text
Description
01 hex
Read coils
Reads the status of single bit(s) in a slave
03 hex
Read multiple registers
Reads the binary content of multiple 16-bit registers in the slave. The maximum number of registers is 26
05 hex
Write single coil
Writes a single on/off bit
10 hex
Write multiple registers
Preset values into a sequence of 16-bit registers. The maximum number of registers is 25
11 hex
Report Slave ID
The SITRANS F slave will respond to a Report Slave ID command (Command 17) request from the master by giving information about device type, vendor, revision level etc. in a format as shown
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Function codes 6.2 Read coils
6.2
Read coils
Command messages The read coils functions (01 hex) allow the master to request information from the slave. The command message of a coil read is structured as shown below. Each row in the table compares to a byte in the message – top byte (Slave address) is transmitted first. The initial slave address is 1. Address 0 (broadcast) and other values between 1 and 255 can be used. The function code of this message is 01 hex (read coil) . The starting coil is the first binary data to be read. The quantity indicates how many consecutive bits are to be read. The quantity may range from 1 to 432 bits. A CRC value is generated from a calculation using the values of the slave address, function code, and data sections of the message. When the slave receives the command message it calculates a CRC-16 value and compares it to the one in the CRC-16 field of the command message. If these two CRC-16 values are the same the slave has received the proper command message. If the two CRC-16 values are not the same the slave will not respond. Table 6- 2
Read coil command messages
Message byte
Example
Slave address
xx hex
Function code
01 hex
Starting coil
Upper Lower
00 hex
Quantity
Upper
00 hex
Lower
xx hex
CRC-16
00 hex
Lower
xx hex
Upper
xx hex
Normal response If the command message has a valid slave address, function code, starting coil and quantity value, the slave will respond with a normal response message. If the command message has an invalid slave address, function code, starting coil and/or quantity, the slave will respond with an exception response message. The normal response message contains the same slave address and function code as the command message. The Bit count is the number of status bits returned in the response message. The number equals the quantity in the command message. The data section of the response message contains a number of bits representing the status of the coils(s) that has been read from the device. The LSB of the coil status byte indicates the status of the coil.
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Function codes 6.2 Read coils Table 6- 3
Read coil normal response messages
Message byte
Example
Slave address
xx hex
Function code
01 hex
Bit count
xx hex
Coil status byte(s)
xx hex xx hex
Next coil status byte(s)
xx hex
Last coil status byte(s)
xx hex
xx hex xx hex CRC-16
Lower
xx hex
Upper
xx hex
Exception response The exception response message contains the same slave address as the command message. The function code of the exception message is actually a value of 80 hex plus the original function code of 01 hex. The exception code indicates where the error occurred in the command message. A complete listing of exception codes is shown in a later chapter. Table 6- 4
Read coil exception response messages
Message byte
Example
Slave address
xx hex
Function code
81 hex
Exception code CRC-16
02 hex Lower
xx hex
Upper
xx hex
Example Read Coil Customer Totalizer (0:00018): ● Query: 1,1,0,18,0,1,93,207 (Hex 01,01,00,12,00,01,5D,CF) ● Response: 1,1,1,0,81,136 (Hex 01,01,01,00,51,88)
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Function codes 6.3 Read multiple registers
6.3
Read multiple registers
Command messages The multiple register read functions (03 hex) allows the master to request information from the slave. The command message of a multiple register read is structured as shown below. Each row in the table compares to byte in the message – top byte (Slave address) is transmitted first. The initial slave address is 1. Address 0 (broadcast) and other values between 1 and 255 can be used. The function code of this message is 03 hex (read multiple registers) The starting register is the first register to be read. The quantity indicates how many consecutive 16-bit registers are to be read. The quantity may range from 1 to 26 registers. If the quantity is greater than 26 an error code of 03 hex is returned in the exception response message. A CRC value is generated from a calculation using the values of the slave address, function code, and data sections of the message. When the slave receives the command message it calculates a CRC-16 value and compares it to the one in the CRC-16 field of the command message. If these two CRC-16 values are the same the slave has received the proper command message. If the two CRC-16 values are not the same the slave will not respond. If the command message has a valid slave address, function code, starting register and quantity value, the slave will respond with a normal response message. If the command message has an invalid function code, starting register and/or quantity, the slave will respond with an exception response message. Table 6- 5
Read multiple registers command messages
Message byte
Example
Slave address
xx hex
Function code
03 hex
Starting register Quantity CRC-16
Upper
00 hex
Lower
20 hex
Upper
00 hex
Lower
04 hex
Lower
xx hex
Upper
xx hex
Normal response The normal response message contains the same slave address and function code as the command message. The Byte count is the number of data bytes returned in the response message. The number is actually the quantity (in the command message) times 2, since there are two bytes of data in each register.
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Function codes 6.3 Read multiple registers The data section of the response message contains 8 upper and 8 lower bits of data for each register that has been read from the device. Table 6- 6
Read multiple registers normal response messages
Message byte
Example
Slave address
xx hex
Function code
03 hex
Byte count
xx hex
Starting register
Upper Lower
xx hex
Next register
Upper
xx hex
Lower
xx hex
Upper
xx hex
Lower
xx hex
Lower
xx hex
Upper
xx hex
Last register CRC-16
xx hex
Exception response The exception response message contains the same slave address as the command message. The function code of the exception message is actually a value of 80 hex plus the original function code of 03 hex. The exception code indicates where the error occurred in the command message. A complete listing of exception codes is shown in chapter "exception handling (Page 35)". Table 6- 7
Read multiple registers exception response messages
Message byte
Example
Slave address
xx hex
Function code
83 hex
Exception code CRC-16
01 hex to 06 hex Lower
xx hex
Upper
xx hex
Example Read actual velocity (4:03001) ● Query: 1,3,11,184,0,2,70,10 (Hex 01,03,0B,B8,00,02,46,0A) ● Response: 1,3,4,64,195,82,139,98,200 (Hex 01,03,04,40,C3,52,8B,62,C8) ● Actual velocity = 6.10383 mm/s.
SITRANS F M MAG 8000 Modbus RTU Operating Instructions, 08/2011, A5E03409989-01
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Function codes 6.4 Write single coil
6.4
Write single coil
Command messages The write coil functions (05 hex) allow the master to control single bits in the slave. The command message of a coil write is structured as shown below. The initial slave address is 1. Address 0 (broadcast) and other values between 1 and 255 can be used. The function code of this message is 05 hex (write coil). The coil address is the coil to be written to. The requested coil status is specified by a constant in the query data field. A value of FF hex , 00 hex (upper, lower) requests the coil/bit to be set. A value of 00 hex , 00 hex requests it to be reset. All other values are illegal and will not affect the coil. CRC check and exception handling is performed as described for command ‘Read multiple registers’. Table 6- 8
Write coil command messages
Message byte
Example
Slave address
xx hex
Function code
05 hex
Coil address
Upper Lower
xx hex
New coil value
Upper
FF hex or 00 hex
Lower
00 hex
CRC-16
xx hex
Lower
xx hex
Upper
xx hex
Normal response The normal response message contains the same slave address and function code as the command message. The coil address is the coil that was written to. The new coil value is the value written to the coil. Table 6- 9
Write coil normal response messages
Message byte
Example
Slave address
xx hex
Function code
05 hex
Coil address New coil value
Upper
xx hex
Lower
xx hex
Upper
FF hex or 00 hex
SITRANS F M MAG 8000 Modbus RTU
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Operating Instructions, 08/2011, A5E03409989-01
Function codes 6.5 Write multiple registers
Message byte CRC-16
Example Lower
00 hex
Lower
xx hex
Upper
xx hex
Exception response The exception response message contains the same slave address as the command message. The function code of the exception message is actually a value of 80 hex plus the original function code of 05 hex. The exception code indicates where the error occurred in the command message. A complete listing of exception codes is shown in chapter "Exception handling (Page 35)". Table 6- 10
Write coil exception response messages
Message byte
Example
Slave address
xx hex
Function code
85 hex
Exception code CRC-16
01 hex to 06 hex Lower
xx hex
Upper
xx hex
Examples Coil 0 (Restart Modbus communication) To activate a new baudrate and parity/framing the coil 0 (restart Modbus communication) must be sent. Otherwise a power down/up initiate a new baudrate and parity/framing: ● Query: 1,5,0,0,255,0,140,58 (Hex 01,05,00,00,FF,00,8C,3A) (Set coil 0 to 0xFF00) ● Receive: 1,5,0,0,255,0,140,58 (Hex 01,05,00,00,FF,00,8C,3A) (Restart Modbus communication)
6.5
Write multiple registers
Command messages The multiple register write functions (10 hex) allow the master to write data to the slaves registers. The command message of a multiple register write is structured as shown below. The initial slave address is 1. Address 0 (broadcast) and other values between 1 and 255 can be used. The function code of this message is 10 hex (write multiple registers). The starting register is the first register to be written to.
SITRANS F M MAG 8000 Modbus RTU Operating Instructions, 08/2011, A5E03409989-01
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Function codes 6.5 Write multiple registers The quantity indicates how many consecutive 16-bit registers are to be written to. The quantity may range from 1 to 25 registers. If the quantity is greater than 25, an error code of 03 hex is returned in the exception response message. The Byte count is the number of bytes of data to be written to the device. The number of bytes is actually the quantity times 2, since there are two bytes of data in each register. The data section of the command message contains 8 upper and 8 lower bits of data for each register that is being written to. CRC check and exception handling is performed as described for command ‘Read multiple registers’. Table 6- 11
Write multiple coil command messages
Message byte
Example
Slave address
xx hex
Function code
10 hex
Starting register
Upper
00 hex
Lower
20 hex
Quantity
Upper
00 hex
Lower
04 hex
Starting register value
Upper
xx hex
Lower
xx hex
Next register value
Upper
xx hex
Lower
xx hex
Upper
xx hex
Lower
xx hex
Byte count
xx hex
Last register value CRC-16
Lower
xx hex
Upper
xx hex
Normal response The normal response message contains the same slave address and function code as the command message. The starting register is the first register that was written to. The quantity value indicates how many consecutive registers were written to. Table 6- 12
Write multiple coil normal response messages
Message byte
Example
Slave address
xx hex
Function code
10 hex
Starting register
Upper
xx hex
Lower
xx hex
Quantity
Upper
xx hex
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Operating Instructions, 08/2011, A5E03409989-01
Function codes 6.5 Write multiple registers
Message byte CRC-16
Example Lower
xx hex
Lower
xx hex
Upper
xx hex
Exception responses The exception response message contains the same slave address as the command message. The function code of the exception message is actually a value of 80 hex plus the original function code of 10 hex. The exception code indicates where the error occurred in the command message. A complete listing of exception codes is shown in chapter "Exception handling (Page 35)". Table 6- 13
Write multiple coil exception response messages
Message byte
Example
Slave address
xx hex
Function code
90 hex
Exception code
01 hex to 06 hex
CRC-16
Lower
xx hex
Upper
xx hex
Example Set baud rate to 38400 baud ● Query: 1,16,2,17,0,1,2,0,5,70,210 (38400 = value 5) (Hex 01,10,02,11,00,01,02,00,05,46,D2) ● Receive: 1,16,2,17,0,1,80,116 (Hex 01,10,02,11,00,01,50,74) To activate a new baudrate and parity/framing the coil 0 (Restart Modbus communication) must be sent. Otherwise a power down/up initiate a new baudrate and parity/framing: ● Query: 1,5,0,0,255,0,140,58 (Hex 01,05,00,00,FF,00,8C,3A) (Set coil 0 to 0xFF00) ● Receive: 1,5,0,0,255,0,140,58 (Hex 01,05,00,00,FF,00,8C,3A) (Restart Modbus communication)
SITRANS F M MAG 8000 Modbus RTU Operating Instructions, 08/2011, A5E03409989-01
33
Function codes 6.6 Report slave ID command
6.6
Report slave ID command All MAG 8000 will respond to a Report Slave ID command (Command 17) request from the master by giving information about device type, vendor, revision level etc. in a format as shown: Table 6- 14
Report slave ID command messages
Message byte
Example
Slave address
xxhex
Function code
11hex
CRC-16
Table 6- 15
Lower
xxhex
Upper
xxhex
Report slave ID messages
Message byte
Description
Length
Slave address
1 byte
Function code
1 byte
Byte count
1 byte
Slave ID
1 byte
Run Indicator
0=Off; FF=Running
1 byte
Product code
0x1B = MAG8000
1 byte
Software code no
"087C4054" for MAG8000
9 bytes
Capability bits
Bits describing the capabilities of this module.
Null terminator included 3 bytes
1.2, 2.4, 4.8, 9.6, 19.2, 38.4 kB/s Manufacturer name
"Siemens" (Read from EEPROM) Null terminator included
12 bytes
Product name
"MAG 8000"
12 bytes
Null terminator included Product major revision
1 byte
Product minor revision
1 byte
Comm option name
Not used in MAG 8000
11 bytes
Comm option code
Not used in MAG 8000
1 byte
Comm option Major revision
Not used in MAG 8000
1 byte
CRC-16
2 bytes
SITRANS F M MAG 8000 Modbus RTU
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Operating Instructions, 08/2011, A5E03409989-01
Function codes 6.7 Exception handling
6.7
Exception handling There is a defined set of exception codes to be returned by slaves in the event of problems. All exceptions are signalled in the response from the slave by adding 80 hex to the function code of the request and following this byte by an exception code.
Table 6- 16
Exception codes
Exception code (dec)
Exception text
Description
01
Illegal function
The function code received in the query is not an allowable action for the slave
02
Illegal data address
The data address received in the query is not an allowable address for the slave.
03
Illegal data value
A value contained in the query data field is not an allowable value for the addressed location. This may indicate a fault in the structure of the remainder of a complex request, such that the implied length is incorrect.
04
Slave device failure
The request is by some other reason not acceptable. It may e.g. indicate that the data value to write is evaluated to be beyond limits.
06
BUSY-acknowledge
The slave is processing a long-duration command. The master should retransmit the message later when the slave is free.
If an exception code 04 is received, further requests have to be done to narrow down the exact problem. If any doubts about the address that failed, "Last Coil/HoldReg ErrorAddr" can be read. This will return the faulty address. Table 6- 17
Last Coil/HoldReg ErrorAddr
MODBUS register
MODBUS address
No. of bytes
Data type
Description
Read/ write
4:00681
680
2
Word
Last Coil ErrorAddr (MODBUS cmd: 1 or 5)
R
4:00682
681
2
Word
Last Coil ErrorNo (127 = No error)
R
4:00683
682
2
Word
Last HoldReg ErrorAddr (MODBUS cmd: 3 or 16) R
4:00684
683
2
Word
Last HoldReg ErrorNo (127 = No error)
R
Reading "Last Coil/HoldReg ErrorNo" will return a detailed error reason. A list of error numbers can be seen below. Table 6- 18
Error numbers
Error Number (Dec)
Error Number (Hex)
Error name
Reason
3
3
Write access denied
This parameter is in a state where it is not writable
4
4
Max. limit
The value was greater than the allowed maximum value
SITRANS F M MAG 8000 Modbus RTU Operating Instructions, 08/2011, A5E03409989-01
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Function codes 6.7 Exception handling
Error Number (Dec)
Error Number (Hex)
Error name
Reason
5
5
Min. limit
The value was less than the allowed minimum value
127
7F
No error
No problem
SITRANS F M MAG 8000 Modbus RTU
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Operating Instructions, 08/2011, A5E03409989-01
7
Technical data
Table 7- 1
Technical data
Device type
Slave
Baud rates
1200, 2400, 4800, 9600, 19200, 38400 bits/sec
Number of stations
Recommended: max. 31 per segment without repeaters
Device address range
1-247
Protocol
RTU (Other Modbus protocols like ASCII, Plus or TCP/IP are not supported.)
Electrical interface
•
RS485, 3-wire
•
RS232, 3-wire
Connecter type
Screw terminals
Supported function codes
•
1 Read coils
•
3 Read holding registers
•
5 Write single coil
•
16 Write multiple registers
•
17 Report slave ID
Broadcast
Yes
Maximum cable length
1200 meters (@ 38400 bits/sec)
Standard
Modbus over serial line v1.0*
Certified
No
Device Profile
None
According to the Specification & Implementation guide v. 1.0 available at the Modbus Organisation website.
SITRANS F M MAG 8000 Modbus RTU Operating Instructions, 08/2011, A5E03409989-01
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Technical data
SITRANS F M MAG 8000 Modbus RTU
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Operating Instructions, 08/2011, A5E03409989-01
Modbus holding registers A.1
A
Introduction to holding registers In the following the holding registers for the MAG 8000 Modbus RTU module are described. 8
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Figure A-1
Modbus Holding Registers Memory Map
● The minimum value of a writable "holding register" value can be read by adding 10000 to the address of the value. ● The maximum value of a writable "holding register" value can be read by adding 20000 to the address of the value. If the value is not directly applicable, the min./max. limit shown will be based on the data type - e.g. a "WORD-type" value will show the limits 0-65535 - even though some of these values are not allowed. Note Reading min./max. values Min./max. values do not apply to all datatypes (e.g. strings). Reading min./max. value for such "holding registers" will return zero-values. Note Firmware version 3.00 Registers and addresses are valid for MAG 8000 firmware 3.00 or newer.
SITRANS F M MAG 8000 Modbus RTU Operating Instructions, 08/2011, A5E03409989-01
39
Modbus holding registers A.2 MODBUS application settings
A.2 Table A- 1
MODBUS application settings Customer profile
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
Read / write
4:02008
2007
6
string
Meter access code
Password to change parameters in the water meter
W
4:00009
8
6
string
New access code
Downloaded password is protected and can not be read.
W
New password can be changed when old password is entered or if hardware key is mounted. 4:00656
655
16
string
Application identifier
Customer application identification information (max 15 characters)
R/W
4:00664
663
16
string
Application location
Customer application location information (max 15 characters)
R/W
Read / write
Table A- 2
Measurement
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
4:03000
2999
4
float32
Actual velocity
Actual velocity in mm/s
R
4:03002
3001
4
float32
Flow rate
Actual flow value
R
4:03004
3003
4
float32
Insulation value
Insulation value from last insulation test
R
4:03006
3005
4
uint32
Insulation tests fulfilled
Number of insulation tests since last power up
R
4:03047
3046
6
date
Insulation test date
Date of last insulation test
R
4:03008
3007
4
sint32
Electrode impedance A
Electrode impedance A for empty pipe detection
R
4:03010
3009
4
sint32
Electrode impedance B
Electrode impedance B for empty pipe detection
R
4:03012
3011
4
float32
Flowrate percent value
Flowrate as percent of Qn
R
Table A- 3
Totalization
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
Read / write
4:03017
3016
8
totaltype
Totalizer 1
Volume for totalization register 1
R/W
4:03021
3020
8
totaltype
Totalizer 2
Volume for totalization register 2
R/W
4:03025
3024
8
totaltype
Customer
Customer totalizer 3 based on totalizer 1 set up
R
totalizer 3
SITRANS F M MAG 8000 Modbus RTU
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Operating Instructions, 08/2011, A5E03409989-01
Modbus holding registers A.3 MODBUS driver settings
A.3 Table A- 4
MODBUS driver settings MODBUS driver settings
MODBUS register
MODBUS address
No. of bytes
Data type
Label
4:00528
527
2
uint16
Device Meter has default address value "1" with Communica selectable address up to 247 tion Address
R
4:00529
528
2
uint16
Baudrate
R
4:00530
529
2
uint16
Parity
Description
Communication port speed •
0 = 1200
•
1 = 2400
•
2 = 4800
•
3 = 9600
•
4 = 19200
•
5 = 38400
Communication port parity •
0 = Even 1 stop
•
1 = Odd 1 stop
•
2 = None 2 stop
•
3 = None 1 stop
Read / write
R
4:00079
78
2
uint16
Device Product ID
Siemens MAG 8000 product ID 10779
4:00531
530
2
uint16
Interframe space
Minimum space between two messages given in R tenth bytes
4:00372
371
2
uint16
Response delay
Minimum time from receiving a request to its response
0:00000
0
1
coil
Reset communica tion driver
Warning! Check settings before reset and R accept new communications settings - otherwise communication will be interrupted! •
0 =No
•
1 = Yes
R
R
SITRANS F M MAG 8000 Modbus RTU Operating Instructions, 08/2011, A5E03409989-01
41
Modbus holding registers A.4 Menu control
A.4 Table A- 5
Menu control Menu control
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
Read / write
4:00234
233
1
uint8
Menu active
1 byte describing which menus are enabled
R
•
Bit 1: Operator menu,
•
Bit 2: Meter info menu,
•
Bit 3: Service menu,
•
Bit 4: Log menu,
•
Bit 5: Statistic menu,
•
Bit 6: Revenue menu,
•
Bit 7: Not Used
•
Bit 8: Not Used
•
Menu active = 15 :
•
Operator; Meter info and Service menu enabled
Example
4:00402
4:00406
4:00222
401
405
221
1
1
1
uint8
uint8
uint8
Default operator menu index
Default menu index. Automatically selected after 10 minutes of no operation of display key. •
0 =Totalizer 1
•
1 =Totalizer 2
•
2 = Actual Flow rate
•
3 = Fault codes
•
4 = Customer Totalizer
Decimal point Decimal point for displayed totalized value
Displayed unit
•
0 = No point
•
1 = One digit after point
•
2 = Two digits after point
•
3 = Three digits after point
•
4 = Automatic point adjust
R
R/W
Displayed m3 unit or an arrow indication for a R unit label •
0 = m3 unit not displayed
•
1 = Use m3 unit
SITRANS F M MAG 8000 Modbus RTU
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Operating Instructions, 08/2011, A5E03409989-01
Modbus holding registers A.5 Sensor characteristics
A.5 Table A- 6
Sensor characteristics Sensor characteristics
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
Read / write
4:00206
205
4
float32
Flow unit factor
Flow unit correction factor from m3/s to other flow unit
R
4:00208
207
4
float32
Totalizer volume unit factor
Totalizer unit correction factor from m3 to other volume unit
R
4:00210
209
12
string
Flowrate unit
Meter unit text for flowrate
R
4:00216
215
12
string
Totalizer unit
Meter unit text for totalized volume
R
4:00223
222
2
uint16
Pipe size
Pipe diameter size in mm
R
4:00224
223
4
float32
Sensor offset
Sensor calibration offset in mm/s
R
4:00226
225
4
float32
Qn
Nominal flow
R
4:00793
792
4
float32
Flow alarm limit
Selectable flow limit for generating a flow alarm
R/W
4:00228
227
4
float32
Calibration factor
Calibration factor
R
4:00230
229
6
date
Calibration date
Date of calibration
R
4:00233
232
1
uint8
Verification mode enable
Select 'Yes' to enable verification mode. R/W High resolution for calibration or verification. Automatically stopped after 4 hours. •
0 = No
•
1 = Yes
4:00117
116
4
float32
Gain correction
Electronic calibration factor
R
4:00236
235
4
float32
Adjustment Factor
Meter correction factor for customer adjustment of the calculated flow value.
R
4:00247
246
1
uint8
Excitation frequency sensor limit
Maximum possible sensor excitation frequency.
R
•
0 = 1/15Hz
•
1 = 1/5Hz
•
2 = 1.5625Hz
•
3 = 3.125Hz
•
4 = 6.25Hz
•
5 = 1/30Hz
•
6 = 1/60Hz
SITRANS F M MAG 8000 Modbus RTU Operating Instructions, 08/2011, A5E03409989-01
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Modbus holding registers A.5 Sensor characteristics
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
Read / write
4:00048
47
1
uint8
Excitation frequency limit
Maximum selectable excitation frequency
R
4:00238
237
1
uint8
Excitation frequency
•
0 = 1/15Hz
•
1 = 1/5Hz
•
2 = 1.5625Hz
•
3 = 3.125Hz
•
4 = 6.25Hz
•
5 = 1/30Hz
•
6 = 1/60Hz
Actual selected excitation frequency •
0 = 1/15Hz
•
1 = 1/5Hz
•
2 = 1.5625Hz
•
3 = 3.125Hz
•
4 = 6.25Hz
•
5 = 1/30Hz
•
6 = 1/60Hz
If the flow subceeds this percentage of Qn, then the flowvalue is set to zero.n.
R
4:00239
238
4
float32
Low flow cut-off
4:00241
240
2
uint16
Filter time constant Generel filter for flow measurement. R Filter constant is the number of excitations the filtering will take place over. Higher number gives a slower and more stable flow signal.
4:00242
241
1
uint8
Empty pipe detection enable
Select 'Yes' to enable empty pipe detection. •
0 = No
•
1 = Yes
R
R
4:00243
242
4
sint32
Empty pipe limit
Electrode impedance in ohm for active empty pipe detection
R
4:00254
253
4
sint32
Low medium impedance alarm
Electrode impedance in ohm for active low impedance alarm detection
R/W
4:00245
244
1
uint8
Insulation test enable
Select 'Yes' for enabling insulation test
R/W
•
0 = No
•
1 = Yes
4:00246
245
2
uint16
Insulation test interval
Number of days between insulation tests
R/W
4:00820
819
4
float32
Reverse flow alarm limit
Selectable reverse flow limit for generating a reverse flow alarm
R/W
SITRANS F M MAG 8000 Modbus RTU
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Operating Instructions, 08/2011, A5E03409989-01
Modbus holding registers A.6 Totalization
A.6
Totalization
Table A- 7
Totalization
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
4:00400
399
1
uint8
Flow direction totalizer 1
Calculation principle on flow R/W direction for forward - reverse or net flow •
0 = Forward
•
1 = Reverse
•
2 = Net
Read / write
4:00073
72
6
date
Totalizer 1 changes date
Date and time when totalizer 1 has been changed
4:00401
400
1
uint8
Flow direction totalizer 2
Calculation principle on flow R/W direction for forward - reverse or net flow
4:00076
75
A.7 Table A- 8
6
date
Totalizer 2 changes date
•
0 = Forward
•
1 = Reverse
•
2 = Net
Date and time when totalizer 2 has been changed
R
R
Pulse output Pulse output
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
Read / write
4:00373
372
1
uint8
Output A enable
Select 'Yes' to enable output A
R/W
4:00374
4:00375
373
374
1
4
uint8
float32
Pulse A function
Amount per pulse A
•
0 = No
•
1 = Yes
Pulse output calculation on pure forward or reverse flow - or net flow for forward and reverse pulse flow •
0 = Forward
•
1 = Reverse
•
2 = Forward net
•
3 = Reverse net
Volume per pulse. Output A
R/W
R/W
SITRANS F M MAG 8000 Modbus RTU Operating Instructions, 08/2011, A5E03409989-01
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Modbus holding registers A.7 Pulse output
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
Read / write
4:00377
376
1
uint8
Pulse width for pulse A
Pulse length when the pulse is active
R/W
4:00378
4:00379
4:00380
377
378
379
1
1
1
uint8
uint8
uint8
Output B enable
Pulse B function
Pulse B direction
•
0 = 10 ms
•
1 = 50 ms
•
2 = 100 ms
•
3 = 500 ms
•
4 = 5 ms
Select 'Yes' to enable output B •
0 = No
•
1 = Yes
Configuration of output B as pulse - alarm or call up function •
0 = Pulse
•
1 = Alarm
•
2 = Call up
Pulse output calculation on pure forward or reverse flow - or net flow for forward and reverse pulse flow •
0 = Forward
•
1 = Reverse
•
2 = Forward net
•
3 = Reverse net
R/W
R/W
R/W
4:00381
380
4
float32
Amount per pulse B
Volume per pulse. Output B
R/W
4:00383
382
1
uint8
Pulse width for pulse B
Pulse length when the pulse is active
R/W
•
0 = 10 ms
•
1 = 50 ms
•
2 = 100 ms
•
3 = 500 ms
SITRANS F M MAG 8000 Modbus RTU
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Operating Instructions, 08/2011, A5E03409989-01
Modbus holding registers A.8 Service control
A.8 Table A- 9
Service control Service control
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
Read / write
0:00000
15
1
coil
Coil current disable
Select 'Yes' to disable coil current for magnetic field
R
0:00000
16
1
coil
Fixed flow mode enable
•
0 = No
•
1 = Yes
Select 'Yes' to enable fixed flow value •
0 = No
•
1 = Yes
R
4:00361
360
4
float32
Fixed flow value
Fixed flow value for enabled fixed flow
R
4:00363
362
6
date
Latest service date
Latest service date (can also be used for date of installation)
R/W
4:00080
79
4
uint32
Operating hours since power up
Total operation hours since first power up
R
4:00366
365
2
uint16
Numbers of power up
Total number of power up since first time power up.
R
4:03033
3032
6
date
Actual date and time
Actual date and time of day-month-year and hours:minutes:seconds
R/W
A.9 Table A- 10
Error messages Error messages
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
Read / write
0:00000
2
-
coil
Insulation alarm output enable
Select 'Yes' to enable current alarm on alarm output / call-up
R/W
•
0 = No
•
1 = Yes
4:00272
271
2
uint16
Insulation fault hours
Total hours fault active
R
4:00273
272
1
uint8
Insulation fault counter
Total number of faults
R
4:00274
273
6
date
Insulation fault appears
First time the fault appeared
R
4:00277
276
6
date
Insulation fault disappears
Last time the fault disappeared
R
SITRANS F M MAG 8000 Modbus RTU Operating Instructions, 08/2011, A5E03409989-01
47
Modbus holding registers A.9 Error messages
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
Read / write
0:00000
3
-
coil
Coil current alarm output enable
Select 'Yes' to enable active alarm on alarm output / call-up
R/W
•
0 = No
•
1 = Yes
4:00281
280
1
uint8
Coil current fault counter
Total number of faults
R
4:00282
281
6
date
Coil current fault appears
First time the fault appeared
R
0:00000
2
-
coil
Insulation alarm output enable
Select 'Yes' to enable current alarm on alarm output / call-up
R
•
0 = No
•
1 = Yes
4:00285
284
6
date
Coil current fault disappears
Last time the fault disappeared
R
0:00000
4
-
coil
Amplifier alarm output enable
Select 'Yes' to enable active alarm on alarm output / call-up
R/W
•
0 = No
•
1 = Yes
4:00288
287
2
uint16
Amplifier fault hours
Total hours fault active
R
4:00289
288
1
uint8
Amplifier fault counter
Total number of faults
R
4:00290
289
6
date
Amplifier fault appears
First time the fault appeared
R
4:00293
292
6
date
Amplifier fault disappears
Last time the fault disappeared
R
0:00000
5
-
coil
Parameter checksum alarm output enable
Select 'Yes' to enable active alarm on alarm output / call-up
R/W
•
0 = No
•
1 = Yes
4:00296
295
2
uint16
Parameter checksum fault hours
Total hours fault active
R
4:00297
296
1
uint8
Parameter checksum fault counter
Total number of faults
R
4:00298
297
6
date
Parameter checksum fault appears
First time the fault appeared
R
4:00301
300
6
date
Parameter checksum fault disappears
Password to change parameters in the water meter
R
SITRANS F M MAG 8000 Modbus RTU
48
Operating Instructions, 08/2011, A5E03409989-01
Modbus holding registers A.9 Error messages
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
0:00000
6
-
coil
Low power alarm Select 'Yes' to enable active alarm on output enable alarm output / call-up •
0 = No
•
1 = Yes
Read / write R/W
4:00304
303
2
uint16
Low power fault hours
Total hours fault active
R
4:00305
304
1
uint8
Low power fault counter
Total number of faults
R
4:00306
305
6
date
Low power fault appears
First time the fault appeared
R
4:00309
308
6
date
Low power fault disappears
Last time the fault disappeared
R
0:00000
7
-
coil
Flow overflow alarm output enable
Select 'Yes' to enable active alarm on alarm output / call-up
R/W
•
0 = No
•
1 = Yes
4:00312
311
2
uint16
Overflow fault hours
Total hours fault active
R
4:00313
312
1
uint8
Overflow fault counter
Total number of faults
R
4:00314
313
6
date
Overflow fault appears
First time the fault appeared
R
4:00317
316
6
date
Overflow fault disappears
Last time the fault disappeared
R
0:00000
8
-
coil
Pulse A overload Select 'Yes' to enable active alarm on alarm output alarm output / call-up enable • 0= no •
R/W
1 = Yes
4:00320
319
2
uint16
Pulse A overload Total hours fault active fault hours
R
4:00321
320
1
uint8
Pulse A overload Total number of faults fault counter
R
4:00322
321
6
date
Pulse A overload First time the fault appeared fault appears
R
4:00325
324
6
date
Pulse A overload Last time the fault disappeared fault disappears
R
0:00000
9
-
coil
Pulse B overload Select 'Yes' to enable active alarm on alarm output alarm output / call-up enable • 0 = No
R/W
•
1 = Yes
4:00328
327
2
uint16
Pulse B overload Total hours fault active fault hours
R
4:00329
328
1
uint8
Pulse B overload Total number of faults fault counter
R
SITRANS F M MAG 8000 Modbus RTU Operating Instructions, 08/2011, A5E03409989-01
49
Modbus holding registers A.9 Error messages
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
Read / write
4:00330
329
6
date
Pulse B overload First time the fault appeared fault appears
R
4:00333
332
6
date
Pulse B overload Last time the fault disappeared fault disappears
R
0:00000
10
-
coil
Consumption alarm output enable
R/W
Select 'Yes' to enable active alarm on alarm output / call-up •
0 = No
•
1 = Yes
4:00336
335
2
uint16
Consumption fault hours
Total hours fault active
R
4:00337
336
1
uint8
Consumption fault counter
Total number of faults
R
4:00338
337
6
date
Consumption fault appears
First time the fault appeared
R
4:00341
340
6
date
Consumption fault disappears
Last time the fault disappeared
R
0:00000
11
-
coil
Leakage alarm output enable
Select 'Yes' to enable active alarm on alarm output / call-up
R/W
•
0 = No
•
1 = Yes
4:00344
343
2
uint16
Leakage fault hours
Total hours fault active
R
4:00345
344
1
uint8
Leakage fault counter
Total number of faults
R
4:00346
345
6
date
Leakage fault appears
First time the fault appeared
R
4:00349
348
6
date
Leakage fault disappears
Last time the fault disappeared
R
0:00000
12
-
coil
Empty pipe alarm output enable
Select 'Yes' to enable active alarm on alarm output / call-up
R/W
•
0 = No
•
1 = Yes
4:00352
351
2
uint16
Empty pipe fault timer
Total hours fault active
R
4:00353
352
1
uint8
Empty pipe fault counter
Total number of faults
R
4:00354
353
6
date
Empty pipe fault appears
First time the fault appeared
R
4:00357
356
6
date
Empty pipe fault disappears
Last time the fault disappeared
R
0:00000
26
-
coil
Low impedance alarm output enable
Select 'Yes' to enable active alarm on alarm output / call-up
R/W
•
0 = No
•
1 = Yes
SITRANS F M MAG 8000 Modbus RTU
50
Operating Instructions, 08/2011, A5E03409989-01
Modbus holding registers A.9 Error messages
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
Read / write
4:00795
794
2
uint16
Low impedance fault timer
Total hours fault active
R
4:00796
795
1
uint8
Low impedance fault counter
Total number of faults
R
4:00797
796
6
date
Low impedance fault appears
First time the fault appeared
R
4:00800
799
6
date
Low impedance fault disappears
Last time the fault disappeared
R
0:00000
27
-
coil
Flow alarm output enable
Select 'Yes' to enable active alarm on alarm output / call-up
R/W
•
0 = No
•
1 = Yes
4:00803
802
2
uint16
Flow alarm fault timer
Total hours fault active
R
4:00804
803
1
uint8
Flow alarm fault counter
Total number of faults
R
4:00805
804
6
date
Flow alarm fault appears
First time the fault appeared
R
4:00808
807
6
date
Flow alarm fault disappears
Last time the fault disappeared
R
0:00000
28
-
coil
Reverse flow alarm output enable
Select 'Yes' to enable active alarm on alarm output / call-up
R/W
•
0 = No
•
1 = Yes
4:00811
810
2
uint16
Reverse flow fault timer
Total hours fault active
R
4:00812
811
1
uint8
Reverse flow fault counter
Total number of faults
R
4:00813
812
6
date
Reverse flow fault appears
First time the fault appeared
R
4:00816
815
6
date
Reverse flow fault disappears
Last time the fault disappeared
R
SITRANS F M MAG 8000 Modbus RTU Operating Instructions, 08/2011, A5E03409989-01
51
Modbus holding registers A.9 Error messages
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
Read / write
4:00360
359
2
uint16
Alarm configuration list
2 bytes describing which errors/warning should generate an alarm or call up on output B
R/W
•
Bit 1: Insulation error
•
Bit 2: Coil current error
•
Bit 3: Preamplifier overload
•
Bit 4: Database checksum error
•
Bit 5: Low power warning
•
Bit 6: Flow overload warning
•
Bit 7: Pulse A overload warning
•
Bit 8: Pulse B overload warning
•
Bit 9: Consumption interval warning
•
Bit 10/L: Leakage warning
•
Bit 11/E: Empty pipe warning
•
Bit 12/C: Low impedance warning
•
Bit 13/d: Flow limit warning
•
Bit 14/A: Reverse flow warning
•
Bit 15: Not used
•
Bit 16: Not used
4:00052
51
2
uint16
Non optimal measure time
Total hours of non optimal measurement conditions
R
4:03016
3015
2
uint16
Fault status
2 bytes describing which errors/warnings are active
R
•
Bit 1: Insulation error
•
Bit 2: Coil current error
•
Bit 3: Preamplifier overload
•
Bit 4: Database checksum error
•
Bit 5: Low power warning
•
Bit 6: Flow overload warning
•
Bit 7: Pulse A overload warning
•
Bit 8: Pulse B overload warning
•
Bit 9: Consumption interval warning
•
Bit 10/L: Leakage warning
•
Bit 11/E: Empty pipe warning
•
Bit 12/C: Low impedance warning
•
Bit 13/d: Flow limit warning
•
Bit 14/A: Reverse flow warning
•
Bit 15: Not used
•
Bit 16: Not used
SITRANS F M MAG 8000 Modbus RTU
52
Operating Instructions, 08/2011, A5E03409989-01
Modbus holding registers A.10 Power control
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
Read / write
0:00000
14
-
coil
Call up acknowledge
Select 'Yes' to reset active call-up
R/W
•
0 = No
•
1 = Yes
4:00049
48
6
date
Date of fault log reset
Date of fault log reset
R
0:00000
13
-
coil
Reset the fault log and faults
Reset the fault log and faults
R/W
A.10 Table A- 11
•
0 = No
•
1 = Reset
Power control Power control
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
Read / write
4:00367
366
1
uint8
Mains frequency
Country related mains power frequency for enabling correct noise filtering
R
4:03029
3028
1
uint8
Power supply
•
0 = 50 Hz
•
1 = 60 Hz
Meter power supply source •
0 = Battery
•
1 = Mains supply
R
4:00368
367
1
uint8
Battery power
Number of installed batteries (Internal batterypack has 2 batteries and external batterypack has 4 batteries)
R
4:03014
3013
4
uint32
Excitations no.
Numbers of excitations since last battery reset
R
4:03030
3029
1
uint8
Actual battery capacity
Actual remaining battery power capacity as a percentage of max capacity
R
4:00089
88
4
uint32
Battery operating Operating time since installation of time batteries (last battery reset)
R
SITRANS F M MAG 8000 Modbus RTU Operating Instructions, 08/2011, A5E03409989-01
53
Modbus holding registers A.10 Power control
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
Read / write
4:03031
3030
1
uint8
Power status
•
0 = Normal operation
•
1 = Battery alarm. Actual battery capacity is below battery alarm level (% of max capacity)
•
2 = Too low power (enters stand by mode)
•
3 = As value 1 and 2 together
•
4 = External power gone
•
5 = As value 1 and 4 together
•
6 = As value 2 and 4 together
•
7 = As value 1 and 2 and 4 together
R
4:00369
368
1
uint8
Battery alarm limit
Battery capacity level (%) where low power alarm will be activated.
R/W
4:03042
3041
4
float32
Transmitter temperature
Temperature inside the transmitter (°C)
R
4:00091
90
6
date
Battery installation date
Latest installation date of batteries
R
0:00000
17
-
coil
Battery change enable
Select 'Yes' to set battery installation date R/W to current date and reset remaining battery operation capacity to maximum.
4:00822
821
1
uint8
Communication module type
•
0 = No
•
1 = Yes
Communication module type - for calculating correct power use. •
0 = No module
•
1 = RS485
•
2 = RS232
•
3 = RS232 always connected
R
SITRANS F M MAG 8000 Modbus RTU
54
Operating Instructions, 08/2011, A5E03409989-01
Modbus holding registers A.11 Consumption statistic
A.11 Table A- 12
Consumption statistic Consumption statistic
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
Read / write
0:00000
18
-
coil
Reset customer totalizer 3
Reset of customer totalizer
R/W
•
0 = No
•
1 = Yes
4:00098
97
6
date
Customer totalizer 3 reset date
Date when customer totalizer has been reset
4:00407
406
4
float32
Highest flowrate
Value of highest measured flow rate
R
4:00409
408
6
date
Date of highest flowrate
Date where highest flow rate occured
R
4:00412
411
4
float32
Lowest flowrate
Value of lowest measured flow rate
R
4:00414
413
6
date
Date of lowest flowrate
Date where lowest flow rate occured
R
4:00417
416
4
float32
Highest day consumption
Value of highest measured daily consumption. Calculation based on totalizer 1
R
4:00419
418
6
date
Date of highest Date when highest measured daily day consumption consumption occured
R
4:00422
421
4
float32
Lowest day consumption
R
4:00424
423
6
date
Date of lowest Date when lowest measured daily day consumption consumption occured
R
4:00164
163
4
float32
Latest week consumption
Latest week consumption (based on totalizer 1 for the last 7 days)
R
4:00162
161
4
float32
Day 1 (yesterday) of last week consumption
Latest day consumption (based on totalizer 1)
R
4:00101
100
4
float32
Day 2 of last week consumption
Latest day-1 consumption (based on totalizer 1)
R
4:00033
32
4
float32
Day 3 of last week consumption
Latest day-2 consumption (based on totalizer 1)
R
4:00035
34
4
float32
Day 4 of last week consumption
Latest day-3 consumption (based on totalizer 1)
R
4:00037
36
4
float32
Day 5 of last week consumption
Latest day-4 consumption (based on totalizer 1)
R
4:00039
38
4
float32
Day 6 of last week consumption
Latest day-5 consumption (based on totalizer 1)
R
Value of lowest measured daily consumption. Calculation based on totalizer 1
R
SITRANS F M MAG 8000 Modbus RTU Operating Instructions, 08/2011, A5E03409989-01
55
Modbus holding registers A.12 Consumption profile
MODBUS register
MODBUS address
No. of bytes
Data type
Label
4:00041
40
4
float32
Day 7 (7 days Latest day-6 consumption (based on ago) of last week totalizer 1) consumption
R
4:03044
3043
4
float32
Actual month consumption
Actual month consumption (based on totalizer 1 from the first in the month)
R
4:00166
165
4
float32
Latest month consumption
Latest month consumption (based on totalizer 1 from the first in the month)
R
4:00427
426
6
date
Reset date of statistic inf.
Date of log reset of statistic information
R
0:00000
19
-
coil
Reset statistic information
Reset the statistic information log
R/W
A.12 Table A- 13
Description
•
0 = No
•
1 = Yes
Read / write
Consumption profile Consumption profile
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
Read / write
4:00430
429
1
uint8
Upper limit in CP Consumption flow range 1 - from 0 to range 1 upper limit 1 as a percent of Qn
R/W
4:00431
430
4
float32
Total time in CP range 1
R
4:00433
432
1
uint8
Upper limit in CP Consumption flow range 2 - from previous R/W range 2 flow range to upper limit 2 as a percent of Qn
4:00434
433
4
float32
Total time in CP range 2
4:00436
435
1
uint8
Upper limit in CP Consumption flow range 3 - from previous R/W range 3 flow range to upper limit 3 as a percent of Qn
4:00437
436
4
float32
Total time in CP range 3
4:00439
438
1
uint8
Upper limit in CP Consumption flow range 4 - from previous R/W range 4 flow range to upper limit 4 as a percent of Qn
4:00440
439
4
float32
Total time in CP range 4
4:00442
441
1
uint8
Upper limit in CP Consumption flow range 5 - from previous R/W range 5 flow range to upper limit 5 as a percent of Qn
4:00443
442
4
float32
Total time in CP range 5
Total hours of flow rate in flow range 1
Total hours of flow rate in flow range 2
Total hours of flow rate in flow range 3
Total hours of flow rate in flow range 4
Total hours of flow rate in flow range 5
R
R
R
R
SITRANS F M MAG 8000 Modbus RTU
56
Operating Instructions, 08/2011, A5E03409989-01
Modbus holding registers A.13 Leakage statistic
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
Read / write
4:00445
444
4
float32
Total time in CP range 6
Total hours of flow rate in the last flow range 6 (from previous flow range up to Qn)
R
4:00447
446
6
date
Reset date of Date of log reset of consumption profile consumptionprofi information le
R
0:00000
20
-
coil
Reset consumption profile
A.13 Table A- 14
Reset the consumption profile information R/W log •
0 = No
•
1 = Yes
Leakage statistic Leakage statistic
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
4:00450
449
1
uint8
Leakage detection mode
Leakage detection can be controlled by a R/W fixed leakage limit or the lowest measured value added the leakage limit
4:00451
450
1
uint8
Leakage excitation frequency
•
0 = Off
•
1 = Fixed limit
•
2 = Lowest added fixed limit
Selected excitation frequency in leakage detection period •
0 = 1/15Hz
•
1 = 1/5Hz
•
2 = 1.5625Hz
•
3 = 3.125Hz
•
4 = 6.25Hz
•
5 = 1/30Hz
•
6 = 1/60Hz
Read / write
R/W
4:00452
451
4
float32
Leakage limit
If measured leakage value is above this limit, a possible leakage is detected
R/W
4:03036
3035
12
string
Leakage value unit
The actual text of unit choice (flowrate or volume)
R
4:00454
453
1
uint8
Leakage source
The source value for leakage can be flowrate or volume
R/W
•
0 = Flowrate
•
1 = Volume
SITRANS F M MAG 8000 Modbus RTU Operating Instructions, 08/2011, A5E03409989-01
57
Modbus holding registers A.13 Leakage statistic
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
Read / write
4:00455
454
2
uint16
Start period for leakage detection
Time of day to start the leakage detection period
R/W
4:00456
455
1
uint8
Duration leakage Leakage detection duration in 10 minutes detection resolution
R/W
4:00457
456
1
uint8
Periods with possible leakage
Actual days/periods where measured leakage value is above leakage limit
R
4:00458
457
1
uint8
Leakage periods before alarm
Number of days / periods before leakage fault/alarm appears
R/W
4:00459
458
4
float32
Lowest measured leakage value
Lowest measured value in leakage period R
4:00461
460
6
date
Date of lowest leakage value
Date of lowest measured value
R
4:00464
463
4
float32
Highest measured leakage value
Highest measured value in leakage period
R
4:00466
465
6
date
Date of highest leakage value
Date of highest measured value
R
4:00469
468
4
float32
Latest leakage period flowrate
Last period lowest flow value
R
4:00370
369
4
float32
Latest leakage period volume
Latest leakage period totalized
R
0:00000
22
-
coil
Reset leakage fault
Reset the leakage fault.
R/W
•
0 = No
•
1 =Yes
SITRANS F M MAG 8000 Modbus RTU
58
Operating Instructions, 08/2011, A5E03409989-01
Modbus holding registers A.14 Datalog
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
Read / write
0:00000
21
-
coil
Reset leakage period information
Reset the leakage indication information
R/W
Leakage status
One byte describing status of leakage detection
4:00403
A.14 Table A- 15
402
1
uint8
•
0 = No
•
1 = Yes
•
Bit 1: Finished successfully
•
Bit 2: Leakage detection running
•
Bit 3: Leakage detection failed (SystemStatus have fatal error)
•
Bit 4: Leakage detection failed (Empty-pipe detection disabled)
•
Bit 5: Leakage detection failed (Coil current off)
•
Bit 6: Leakage detection failed (Insulation test was active during detection)
•
Bit 7 : Leakage detection stopped because leakage parameter was changed.
R/W
Datalog Datalog
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
Read / write
4:00471
470
1
uint8
Log interval
Log interval
R/W
•
0 = Daily
•
1 = Weekly (7 days)
•
2 = Monthly
4:00235
234
1
uint8
Delay weekly log Delay of weekly data logging from current interval day to first day logging at 00:00:00. Thereafter a fixed interval of 7 days.
R/W
4:00472
471
4
float32
Limit for too high consumption
Limit for too high consumption during current log interval. Based on totalizer 1
R/W
4:00474
473
4
float32
Limit for too low consumption
Limit for too low consumption during current log interval. Based on totalizer 1
R/W
SITRANS F M MAG 8000 Modbus RTU Operating Instructions, 08/2011, A5E03409989-01
59
Modbus holding registers A.14 Datalog
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
0:00000
23
-
coil
Reset consumption log fault
Reset the consumption fault. Caused by R/W too low or too high consumption in the log interval •
0 = No
•
1 = Yes
Read / write
4:00476
475
6
date
Date of latest log Date of latest stored value for log 1 period
R
4:00479
478
4
float32
Latest Log period totalized (1)
Latest logged value of consumption based on totalizer 1
R
4:00481
480
4
float32
Latest Log period totalized (2)
Latest logged value of consumption based on totalizer 2
R
4:00483
482
2
uint16
Latest Log period fault status
Two bytes describing fault status in log period
R
4:00484
483
1
uint8
Latest Log period status information
•
Bit 1: Insulation error
•
Bit 2: Coil current error
•
Bit 3: Preamplifier overload
•
Bit 4: Database checksum error
•
Bit 5: Low power warning
•
Bit 6: Flow overload warning
•
Bit 7: Pulse A overload warning
•
Bit 8: Pulse B overload warning
•
Bit 9: Consumption interval warning
•
Bit 10/L: Leakage warning
•
Bit 11/E: Empty pipe warning
•
Bit 12/C: Low impedance warning
•
Bit 13/d: Flow limit warning
•
Bit 14: Not used
•
Bit 15: Not used
•
Bit 16: Not used
One byte describing status information in log period •
Bit 1: Totalizer 1 or 2 changed or reset
•
Bit 2: Tariff setting changed or reset
•
Bit 3: Tariff register changed or reset
•
Bit 4: Date - time changed
•
Bit 5: Alarm active in logged period (See alarm fault log)
•
Bit 6: Fault log has been reset
•
Bit 7: HW lock broken
•
Bit 8: Power Up
R
SITRANS F M MAG 8000 Modbus RTU
60
Operating Instructions, 08/2011, A5E03409989-01
Modbus holding registers A.14 Datalog
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
Read / write
4:00485
484
6
date
Date of log period 2
Date where value for log 2 is stored
R
4:00488
487
4
float32
Log period 2 totalized (1)
Previous logged value of consumption based on totalizer 1
R
4:00490
489
4
float32
Log period 2 totalized (2)
Previous logged value of consumption based on totalizer 2
R
4:00492
491
2
uint16
Log period 2 fault status
Two bytes describing fault status in log period
R
4:00493
492
1
uint8
Log period 2 status information
•
Bit 1: Insulation error
•
Bit 2: Coil current error
•
Bit 3: Preamplifier overload
•
Bit 4: Database checksum error
•
Bit 5: Low power warning
•
Bit 6: Flow overload warning
•
Bit 7: Pulse A overload warning
•
Bit 8: Pulse B overload warning
•
Bit 9: Consumption interval warning
•
Bit 10/L: Leakage warning
•
Bit 11/E: Empty pipe warning
•
Bit 12/C: Low impedance warning
•
Bit 13/d: Flow limit warning
•
Bit 14: Not used
•
Bit 15: Not used
•
Bit 16: Not used
One byte describing status information in log period •
Bit 1: Totalizer 1 or 2 changed or reset
•
Bit 2: Tariff setting changed or reset
•
Bit 3: Tariff register changed or reset
•
Bit 4: Date - time changed
•
Bit 5: Alarm active in logged period (See alarm fault log)
•
Bit 6: Fault log has been reset
•
Bit 7: HW lock broken
•
Bit 8: Power Up
R
4:00494
493
6
date
Date of log period 3
Date where value for log 3 is stored
R
4:00497
496
4
float32
Log period 3 totalized (1)
Log period 3 logged value of consumption R based on totalizer 1
4:00499
498
4
float32
Log period 3 totalized (2)
Log period 3 logged value of consumption R based on totalizer 2
SITRANS F M MAG 8000 Modbus RTU Operating Instructions, 08/2011, A5E03409989-01
61
Modbus holding registers A.14 Datalog
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
Read / write
4:00501
500
2
uint16
Log period 3 fault status
See log period 2
R
4:00502
501
1
uint8
Log period 3 status information
See log period 2
R
4:00503
502
6
date
Date of log period 4
Date where value for log 4 is stored
R
4:00506
505
4
float32
Log period 4 totalized (1)
Log period 4 logged value of consumption R based on totalizer 1
4:00508
507
4
float32
Log period 4 totalized (2)
Log period 4 logged value of consumption R based on totalizer 2
4:00510
509
2
uint16
Log period 4 fault status
See log period 2
R
4:00511
510
1
uint8
Log period 4 status information
See log period 2
R
4:00532
531
6
date
Date of log period 5
Date where value for log 5 is stored
R
4:00535
534
4
float32
Log period 5 totalized (1)
Log period 5 logged value of consumption R based on totalizer 1
4:00537
536
4
float32
Log period 5 totalized (2)
Log period 5 logged value of consumption R based on totalizer 2
4:00539
538
2
uint16
Log period 5 fault status
See log period 2
R
4:00540
539
1
uint8
Log period 5 status information
See log period 2
R
4:00541
540
6
date
Date of log period 6
Date where value for log 6 is stored
R
4:00544
543
4
float32
Log period 6 totalized (1)
Log period 6 logged value of consumption R based on totalizer 1
4:00546
545
4
float32
Log period 6 totalized (2)
Log period 6 logged value of consumption R based on totalizer 2
4:00548
547
2
uint16
Log period 6 fault status
See log period 2
R
4:00549
548
1
uint8
Log period 6 status information
See log period 2
R
4:00550
549
6
date
Date of log period 7
Date where value for log 7 is stored
R
4:00553
552
4
float32
Log period 7 totalized (1)
Log period 7 logged value of consumption R based on totalizer 1
4:00555
554
4
float32
Log period 7 totalized (2)
Log period 7 logged value of consumption R based on totalizer 2
4:00557
556
2
uint16
Log period 7 fault status
See log period 2
R
SITRANS F M MAG 8000 Modbus RTU
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Operating Instructions, 08/2011, A5E03409989-01
Modbus holding registers A.14 Datalog
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
Read / write
4:00558
557
1
uint8
Log period 7 status information
See log period 2
R
4:00559
558
6
date
Date of log period 8
Date where value for log 8 is stored
R
4:00562
561
4
float32
Log period 8 totalized (1)
Log period 8 logged value of consumption R based on totalizer 1
4:00564
563
4
float32
Log period 8 totalized (2)
Log period 8 logged value of consumption R based on totalizer 2
4:00566
565
2
uint16
Log period 8 fault status
See log period 2
R
4:00567
566
1
uint8
Log period 8 status information
See log period 2
R
4:00568
567
6
date
Date of log period 9
Date where value for log 9 is stored
R
4:00571
570
4
float32
Log period 9 totalized (1)
Log period 9 logged value of consumption R based on totalizer 1
4:00573
572
4
float32
Log period 9 totalized (2)
Log period 9 logged value of consumption R based on totalizer 2
4:00575
574
2
uint16
Log period 9 fault status
See log period 2
R
4:00576
575
1
uint8
Log period 9 status information
See log period 2
R
4:00577
576
6
date
Date of log period 10
Date where value for log 10 is stored
R
4:00580
579
4
float32
Log period 10 totalized (1)
Log period 10 logged value of consumption based on totalizer 1
R
4:00582
581
4
float32
Log period 10 totalized (2)
Log period 10 logged value of consumption based on totalizer 2
R
4:00584
583
2
uint16
Log period 10 fault status
See log period 2
R
4:00585
584
1
uint8
Log period 10 status information
See log period 2
R
4:00586
585
6
date
Date of log period 11
Date where value for log 11 is stored
R
4:00589
588
4
float32
Log period 11 totalized (1)
Log period 11 logged value of consumption based on totalizer 1
R
4:00591
590
4
float32
Log period 11 totalized (2)
Log period 11 logged value of consumption based on totalizer 2
R
4:00593
592
2
uint16
Log period 11 fault status
See log period 2
R
4:00594
593
1
uint8
Log period 11 status information
See log period 2
R
SITRANS F M MAG 8000 Modbus RTU Operating Instructions, 08/2011, A5E03409989-01
63
Modbus holding registers A.14 Datalog
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
Read / write
4:00595
594
6
date
Date of log period 12
Date where value for log 1 2 is stored
R
4:00598
597
4
float32
Log period 12 totalized (1)
Log period 12 logged value of consumption based on totalizer 1
R
4:00600
599
4
float32
Log period 12 totalized (2)
Log period 12 logged value of consumption based on totalizer 2
R
4:00602
601
2
uint16
Log period 12 fault status
See log period 2
R
4:00603
602
1
uint8
Log period 12 status information
See log period 2
R
4:00604
603
6
date
Date of log period 13
Date where value for log 13 is stored
R
4:00607
606
4
float32
Log period 13 totalized (1)
Log period 13 logged value of consumption based on totalizer 1
R
4:00609
608
4
float32
Log period 13 totalized (2)
Log period 13 logged value of consumption based on totalizer 2
R
4:00611
610
2
uint16
Log period 13 fault status
See log period 2
R
4:00612
611
1
uint8
Log period 13 status information
See log period 2
R
4:00613
612
6
date
Date of log period 14
Date where value for log 14 is stored
R
4:00616
615
4
float32
Log period 14 totalized (1)
Log period 14 logged value of consumption based on totalizer 1
R
4:00618
617
4
float32
Log period 14 totalized (2)
Log period 14 logged value of consumption based on totalizer 2
R
4:00620
619
2
uint16
Log period 14 fault status
See log period 2
R
4:00621
620
1
uint8
Log period 14 status information
See log period 2
R
4:00622
621
6
date
Date of log period 15
Date where value for log 15 is stored
R
4:00625
624
4
float32
Log period 15 totalized (1)
Log period 15 logged value of consumption based on totalizer 1
R
4:00627
626
4
float32
Log period 15 totalized (2)
Log period 15 logged value of consumption based on totalizer 2
R
4:00629
628
2
uint16
Log period 15 fault status
See log period 2
R
4:00630
629
1
uint8
Log period 15 status information
See log period 2
R
4:00631
630
6
date
Date of log period 16
Date where value for log 16 is stored
R
SITRANS F M MAG 8000 Modbus RTU
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Operating Instructions, 08/2011, A5E03409989-01
Modbus holding registers A.14 Datalog
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
Read / write
4:00634
633
4
float32
Log period 16 totalized (1)
Log period 16 logged value of consumption based on totalizer 1
R
4:00636
635
4
float32
Log period 16 totalized (2)
Log period 16 logged value of consumption based on totalizer 2
R
4:00638
637
2
uint16
Log period 16 fault status
See log period 2
R
4:00639
638
1
uint8
Log period 16 status information
See log period 2
R
4:00678
677
6
date
Date of log period 17
Date where value for log 17 is stored
R
4:00681
680
4
float32
Log period 17 totalized (1)
Log period 17 logged value of consumption based on totalizer 1
R
4:00683
682
4
float32
Log period 17 totalized (2)
Log period 17 logged value of consumption based on totalizer 2
R
4:00685
684
2
uint16
Log period 17 fault status
See log period 2
R
4:00686
685
1
uint8
Log period 17 status information
See log period 2
R
4:00687
686
6
date
Date of log period 18
Date where value for log 18 is stored
R
4:00690
689
4
float32
Log period 18 totalized (1)
Log period 18 logged value of consumption based on totalizer 1
R
4:00692
691
4
float32
Log period 18 totalized (2)
Log period 18 logged value of consumption based on totalizer 2
R
4:00694
693
2
uint16
Log period 18 fault status
See log period 2
R
4:00695
694
1
uint8
Log period 18 status information
See log period 2
R
4:00696
695
6
date
Date of log period 19
Date where value for log 19 is stored
R
4:00699
698
4
float32
Log period 19 totalized (1)
Log period 19 logged value of consumption based on totalizer 1
R
4:00701
700
4
float32
Log period 19 totalized (2)
Log period 19 logged value of consumption based on totalizer 2
R
4:00703
702
2
uint16
Log period 19 fault status
See log period 2
R
4:00704
703
1
uint8
Log period 19 status information
See log period 2
R
4:00705
704
6
date
Date of log period 20
Date where value for log 20 is stored
R
4:00708
707
4
float32
Log period 20 totalized (1)
Log period 20 logged value of consumption based on totalizer 1
R
SITRANS F M MAG 8000 Modbus RTU Operating Instructions, 08/2011, A5E03409989-01
65
Modbus holding registers A.14 Datalog
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
Read / write
4:00710
709
4
float32
Log period 20 totalized (2)
Log period 20 logged value of consumption based on totalizer 2
R
4:00712
711
2
uint16
Log period 20 fault status
See log period 2
R
4:00713
712
1
uint8
Log period 20 status information
See log period 2
R
4:00714
713
6
date
Date of log period 21
Date where value for log 21 is stored
R
4:00717
716
4
float32
Log period 21 totalized (1)
Log period 21 logged value of consumption based on totalizer 1
R
4:00719
718
4
float32
Log period 21 totalized (2)
Log period 21 logged value of consumption based on totalizer 2
R
4:00721
720
2
uint16
Log period 21 fault status
See log period 2
R
4:00722
721
1
uint8
Log period 21 status information
See log period 2
R
4:00723
722
6
date
Date of log period 22
Date where value for log 22 is stored
R
4:00726
725
4
float32
Log period 22 totalized (1)
Log period 22 logged value of consumption based on totalizer 1
R
4:00728
727
4
float32
Log period 22 totalized (2)
Log period 22 logged value of consumption based on totalizer 2
R
4:00730
729
2
uint16
Log period 22 fault status
See log period 2
R
4:00731
730
1
uint8
Log period 22 status information
See log period 2
R
4:00732
731
6
date
Date of log period 23
Date where value for log 23 is stored
R
4:00735
734
4
float32
Log period 23 totalized (1)
Log period 23 logged value of consumption based on totalizer 1
R
4:00737
736
4
float32
Log period 23 totalized (2)
Log period 23 logged value of consumption based on totalizer 2
R
4:00739
738
2
uint16
Log period 23 fault status
See log period 2
R
4:00740
739
1
uint8
Log period 23 status information
See log period 2
R
4:00741
740
6
date
Date of log period 24
Date where value for log 24 is stored
R
4:00744
743
4
float32
Log period 24 totalized (1)
Log period 24 logged value of consumption based on totalizer 1
R
4:00746
745
4
float32
Log period 24 totalized (2)
Log period 24 logged value of consumption based on totalizer 2
R
SITRANS F M MAG 8000 Modbus RTU
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Operating Instructions, 08/2011, A5E03409989-01
Modbus holding registers A.14 Datalog
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
Read / write
4:00748
747
2
uint16
Log period 24 fault status
See log period 2
R
4:00749
748
1
uint8
Log period 24 status information
See log period 2
R
4:00750
749
6
date
Date of log period 25
Date where value for log 25 is stored
R
4:00753
752
4
float32
Log period 25 totalized (1)
Log period 25 logged value of consumption based on totalizer 1
R
4:00755
754
4
float32
Log period 25 totalized (2)
Log period 25 logged value of consumption based on totalizer 2
R
4:00757
756
2
uint16
Log period 25 fault status
See log period 2
R
4:00758
757
1
uint8
Log period 25 status information
See log period 2
R
4:00759
758
6
date
Date of log period 26
Date where value for log 26 is stored
R
4:00762
761
4
float32
Log period 26 totalized (1)
Log period 26 logged value of consumption based on totalizer 1
R
4:00764
763
4
float32
Log period 26 totalized (2)
Log period 26 logged value of consumption based on totalizer 2
R
4:00766
765
2
uint16
Log period 26 fault status
See log period 2
R
4:00767
766
1
uint8
Log period 26 status information
See log period 2
R
SITRANS F M MAG 8000 Modbus RTU Operating Instructions, 08/2011, A5E03409989-01
67
Modbus holding registers A.15 Consumption readings
A.15 Table A- 16
Consumption readings Consumption readings
MODBUS register
MODBUS address
No. of bytes
Data type
Label
Description
Read / write
4:00144
143
1
uint8
Actual flow meter One byte describing actual status R status • Bit 1: Totalizer 1 or 2 changed or reset •
Bit 2: Tariff setting changed or reset
•
Bit 3: Tariff register changed or reset
•
Bit 4: Date - time changed
•
Bit 5: Alarm active
•
Bit 6: Fault log has been reset
•
Bit 7: HW lock broken
•
Bit 8: Power Up
4:00145
144
6
SettlingD ate
Next settling date
Next automatically settling date where actual value of totalizer 1 is stored
R/W
4:00148
147
6
date
Latest settling date
Latest settling date where value of totalizer 1 was stored
R
4:00151
150
8
totaltype
Latest totalizer 1 value
Latest stored value of totalizer 1
R
4:00155
154
6
date
Previous settling date
Previous settling date where value of totalizer 1 was stored
R
4:00158
157
8
totaltype
Previous totalizer Previous stored value of totalizer 1 1 value
R
SITRANS F M MAG 8000 Modbus RTU
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Operating Instructions, 08/2011, A5E03409989-01
B
Appendix B.1
Data type mapping Some standard data types are defined in the MAG 8000 protocol. Most of these data types are not present in the Modbus RTU protocol as it defines ‘Registers’ and ‘Coils’ for all variables. A register in this context is always 16 bit long.
Table B- 1
Data type mapping
Datatype
Modbus RTU implementation
uint8
Data organized as 8-bit unsigned integers. •
The parameters are read using function code 03 hex ‘Read multiple registers’.
• The parameters are written using function code 10 hex ‘Write multiple registers’. ‘uint8’ type of data is accessed through a single register, where the data is found in the lower byte of the register. Data value can be 0 – 255 with no sign bit. uint16
Data organized as 16-bit unsigned integers. •
The parameters are read using function code 03 hex ‘Read multiple registers’.
• The parameters are written using function code 10 hex ‘Write multiple registers’. ‘uint16’ type of data is accessed through a single register. Data value can be 0 – 65536 with no sign bit. float32
Data organized as 32-bit signed floats (IEEE format). •
The parameters are read using function code 03 hex ‘Read multiple registers’.
• The parameters are written using function code 10 hex ‘Write multiple registers’. ‘float32’ type of data is accessed through two registers. Data values are coded in IEEE floating point format. float64
Data organized as 64-bit signed floats (IEEE format). •
The parameters are read using function code 03 hex ‘Read multiple registers’.
• The parameters are written using function code 10 hex ‘Write multiple registers’. ‘float64’ type of data is accessed through four registers. Data values are coded in IEEE floating point format. String
Consecutive pairs of 8-bit ASCII characters stored one pair per 16-bit register. •
Strings are read using function code 03 hex "Read multiple registers’.
• Strings are written using function code 10 hex ‘Write multiple registers’. ‘string’ type of data must be read or written as a series of 1 to 25 consecutive registers, depending on the number of characters specified for the string. The max. string length is 50 chars (incl. delimiter). Strings are terminated by a zero-delimiter.
SITRANS F M MAG 8000 Modbus RTU Operating Instructions, 08/2011, A5E03409989-01
69
Appendix B.2 CRC calculation
Datatype
Modbus RTU implementation
TotalType
Data type defined by Siemens mainly used for Totalizer values. TotalType consist of two parts: 1. signed long Number - contains the integer part of Value 2. signed long Decimal – contains the fractional part of the Value multiplied with 1.0E9
Date
•
The parameters are read using function code 03 hex ‘Read multiple registers’.
•
The parameters are written using function code 10 hex ‘Write multiple registers’.
Data type defined by Siemens used for dates. Date consist of 6 parts: 1. Unsigned Char Year 2. Unsigned Char Month 3. Unsigned Char Day 4. Unsigned Char Hour 5. Unsigned Char Minute 6. Unsigned Char Second
B.2
•
The parameters are read using function code 03 hex ‘Read multiple registers’.
•
The parameters are written using function code 10 hex ‘Write multiple registers’.
CRC calculation The Cyclical Redundancy Checking (CRC) field is two bytes, containing a 16–bit binary value. The CRC value is first generated by the transmitting device, which appends the CRC to the message. The receiving device recalculates a CRC during receipt of the message, and compares the calculated value to the actual value it received in the CRC field. If the two values are not equal an error occurs. In the following a short text description of how the CRC is calculated is provided. This description is then followed by a C programming example.
CRC calculation 1. Load a 16–bit register with FFFF hex (all 1’s). Call this the CRC register. 2. Exclusive OR the first 8–bit byte of the message with the low–order byte of the 16–bit CRC register, putting the result in the CRC register. 3. Shift the CRC register one bit to the right (toward the LSB), zero–filling the MSB. Extract and examine the LSB. 4. (If the LSB was 0): Repeat Step 3 (another shift). (If the LSB was 1): Exclusive OR the CRC register with the polynomial value 0xA001 (1010 0000 0000 0001). 5. Repeat Steps 3 and 4 until 8 shifts have been performed. When this is done, a complete 8–bit byte will have been processed. 6. Repeat Steps 2 through 5 for the next 8–bit byte of the message. Continue doing this until all bytes have been processed.
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Appendix B.2 CRC calculation 7. The final content of the CRC register is the CRC value. 8. When the CRC is placed into the message, its upper and lower bytes must be swapped as described below.
Placing the CRC into the Message When the 16–bit CRC (two 8–bit bytes) is transmitted in the message, the low-order byte will be transmitted first, followed by the high-order byte. For example, if the CRC value is 1241 hex (0001 0010 0100 0001): Addr
Func
Data count
Data n
Data n+1
Data n+2
Data n+x
CRC LO
CRC HI
0x41
0x12
CRC programming example /* Table of CRC values for high-order byte */ static __flash unsigned char auchCRCHi[] = { 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x41, 0x00, 0xC1, 0x81, 0x40
0x01, 0xC0, 0x80, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80,
SITRANS F M MAG 8000 Modbus RTU Operating Instructions, 08/2011, A5E03409989-01
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Appendix B.2 CRC calculation } ; /* Table of CRC values for low-order byte static __flash char auchCRCLo[] = { 0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC7, 0x05, 0xC5, 0xC4, 0x04, 0xCC, 0x0C, 0x0D, 0xCD, 0x0F, 0xCF, 0xCB, 0x0B, 0xC9, 0x09, 0x08, 0xC8, 0xD8, 0x18, 0x19, 0xD9, 0x1B, 0xDE, 0xDF, 0x1F, 0xDD, 0x1D, 0x1C, 0xDC, 0x14, 0xD4, 0xD5, 0x15, 0xD2, 0x12, 0x13, 0xD3, 0x11, 0xD1, 0xD0, 0x10, 0xF0, 0x30, 0x31, 0x32, 0x36, 0xF6, 0xF7, 0x37, 0xF5, 0x35, 0x34, 0xF4, 0x3C, 0xFC, 0x3E, 0xFE, 0xFA, 0x3A, 0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38, 0x28, 0x2B, 0x2A, 0xEA, 0xEE, 0x2E, 0x2F, 0xEF, 0x2D, 0xED, 0xEC, 0x2C, 0x27, 0xE7, 0xE6, 0x26, 0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xA1, 0x63, 0xA3, 0xA2, 0x62, 0x66, 0xA6, 0xA7, 0x67, 0xA5, 0x65, 0xAD, 0x6D, 0xAF, 0x6F, 0x6E, 0xAE, 0xAA, 0x6A, 0x6B, 0xAB, 0x69, 0xB8, 0xB9, 0x79, 0xBB, 0x7B, 0x7A, 0xBA, 0xBE, 0x7E, 0x7F, 0xBF, 0xB4, 0x74, 0x75, 0xB5, 0x77, 0xB7, 0xB6, 0x76, 0x72, 0xB2, 0xB3, 0xB0, 0x50, 0x90, 0x91, 0x51, 0x93, 0x53, 0x52, 0x92, 0x96, 0x56, 0x94, 0x54, 0x9C, 0x5C, 0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E, 0x5A, 0x59, 0x58, 0x98, 0x88, 0x48, 0x49, 0x89, 0x4B, 0x8B, 0x8A, 0x4A, 0x8D, 0x4D, 0x4C, 0x8C, 0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x83, 0x41, 0x81, 0x80, 0x40 } ;
*/ 0xC2, 0xC6, 0x06, 0x07, 0xCE, 0x0E, 0x0A, 0xCA, 0xDB, 0xDA, 0x1A, 0x1E, 0xD7, 0x17, 0x16, 0xD6, 0xF1, 0x33, 0xF3, 0xF2, 0xFD, 0x3D, 0xFF, 0x3F, 0xE8, 0xE9, 0x29, 0xEB, 0xE4, 0x24, 0x25, 0xE5, 0xE0, 0xA0, 0x60, 0x61, 0x64, 0xA4, 0x6C, 0xAC, 0xA9, 0xA8, 0x68, 0x78, 0x7D, 0xBD, 0xBC, 0x7C, 0x73, 0xB1, 0x71, 0x70, 0x57, 0x97, 0x55, 0x95, 0x9A, 0x9B, 0x5B, 0x99, 0x4E, 0x8E, 0x8F, 0x4F, 0x86, 0x82, 0x42, 0x43,
unsigned short int CRC16(unsigned char *puchMsg, unsigned short int usDataLen) { unsigned char uchCRCHi = 0xFF; /* high byte of CRC initialized */ unsigned char uchCRCLo = 0xFF; /* low byte of CRC initialized */ unsigned uIndex ; /* will index into CRC lookup table */ while(usDataLen--) /* pass through message buffer */ { uIndex = uchCRCHi ^ *puchMsg++ ; /* calculate the CRC */ uchCRCHi = uchCRCLo ^ auchCRCHi[uIndex] ; uchCRCLo = auchCRCLo[uIndex] ; } #ifdef INTEL_LIKE_PROCESSOR
SITRANS F M MAG 8000 Modbus RTU
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Operating Instructions, 08/2011, A5E03409989-01
Appendix B.2 CRC calculation return (unsigned short int)((uchCRCLo
