Quick Start MPI / S7 Protocol communication with Siemens S7-300 and S7-400 PLCs Rev

Date

File Name

1.0

19/01/07

QuickStart_PFB MPI/S7 comm with Siemens S7-300 and S7-400 PLC

Description •

• • •

Product concerned: All BradCommunications™ Products that allows a Profibus MPI and/or a S7 Protocol communication with Siemens S7 PLC. - The applicom PC Network Interface Card: The applicom PCNIC solution is based on a co-processor / intelligent card that is able to embed and execute the communication with PLCs for high performance. The reference concerned: PN# APP-PS7-PCU; PN# APP-PFB-PCU; PN# APP-PFB-CPI - The applicom Gateway: The applicom Gateway solution is based on a stand-alone black box that embeds and executes the communication with PLCs and allows to link the data to additional PLC over different communication protocols. The reference concerned: PN# APP-ESP-GTW - The applicom PROFINET IO Proxy: The applicom PROFINET IO Proxy solution is based on a stand alone black box that embeds and executes the communication with PLCs and allows to link the data to a ProfiNet IO Controller. The reference concerned: PN# APP-PNT-GTW-P - The Direct-Link PC Network Interface: The Direct-Link PCNI solution is based on a non-intelligent card that executes the communication with PLCs for light application. The reference concerned: PN# DRL-MPI-PCU, PN# DRL-MPI-USB, PN# DRL-PFB-USB.

Environment: Quickstart realized with : - Windows XP SP2 Related documents: - Product Help files, available on the CD from the documentation directory. - Technical Notes are on the CD from the Technote directory Restriction: None

Summary: This Quickstart provides you the minimal step to start up a Profibus MPI and/or a S7 Protocol communication with an S7-300 or S7-400 PLC. This Communication Quickstart completes the Product Quickstart that explains how to install and use the product you have. Please read first the Product Quickstart. Note : According to the product (NIC, gateway, software driver) you use, the console configuration software may differ on few topics, but communication configurations parameters will be identical.

1 How configure S7 PLC in the applicom interface card 1.1 The Console description To start the configuration Console click on the

button in the applicom directory: define • Protocol parameters • Equipment list and parameters

Channels available to define the protocols used Library of equipments to add in the active configuration Loggin area to see warning and error messages during the configuration

Status • Board configured • Board status • Configuration status

1.2 Select and setup the communication interface Specify the interface card: - Right Click on “Board configuration” Select “add board” Select the card installed on the PC, click OK. Note : the list can be different depending on the product you are using! -

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1.3 Configure the protocol Configure the card channel properties, by a double click on “Profibus, ..”, in the right side of the Console. A new window appears, in which you can modify the Profibus parameters, depending on your network (baud rate, timing parameters, …).

Baud Rate: Select the Profibus communication Baud Rate. TS: Defines the Profibus unique address for the BradCommunication Board on the Profibus Network. This address has to be different from any other device Profibus address present on the network. HSA: Defines the Highest active station address on the network. Set this value higher then the highest Profibus address present on the network or set it the 126 (max). Profile: This defines automatically the Profibus Timing profile that will be used to manage the communication. MPI : Use this Profile if your communication is only with MPI devices DP : Use this Profile if your communication is only with DP devices Universal: Use this Profile if you are planning various communications. Note : All devices connected to the Profibus Fieldbus has to be set to the same communication timings! For details about the timing value used by the Profile check the parameters defined under the “Advanced Configuration” tab.

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1.4 Add the equipments Insert from the Equipment Library the device type you want to communicate with. Use the Drag & Drop method or the insert button Different types of card should have different list of equipments available: - S7-MPI for communication over the S7 MPI programming port - S7-300 and S7-400 for Profibus S7 communication with respective CPU type.

Configure now the equipment properties: Topic Name: Equipment name that will be used in the Data Servers (OPC / DDE…) to access to this PLC Number: Equipment Number that will be used in the DLL or in the various test and diagnostic tools to identify this equipment. Link Parameters: Selected, this checkbox will link the different parameters to the Equipment value (here the Profibus address) Station address: Equipment Address to access to the remote equipment. Local SAP: the used SAP (Service Access Point) for the communication between the card and the PLC.

Rack Number / CPU Slot: Identifies the position of the Siemens S7 CPU. These parameters are set by default but can be different in your Simatic Step7 configuration. Configure this according to your Step7 project. Link Type: Specifies the type of connection that will be opened (Standard, PG or OP). For more information about it please refer to section 5 Communication Troubleshooting / FAQ

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2 How configure S7 PLC Profibus interface In the Step7 project, open the NetPro program: Open the CPU Properties (for the MPI communication) or the CP Properties (for the S7 protocol communication) and click on the communication interface property button. Set the Profibus address and the parameters of the connected network (timings, etc.).

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Download all modifications in the S7 PLC, clicking on the to communicate.

button; now the PLC is ready

Important note: for an S7 Protocol communication with the PLC prefer always the Universal (DP/FMS) communication timing profil. The default timing values of the Profibus channel for the applicom PCNIC are defined according to the Universal (DP/FMS) profile.

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3 Check the communication with your equipments Now the card and the PLC are ready to communicate together. Initialize the communication solution with the following button configuration in your card.

in order to update the

Use the online action tool (on the lower left part of the console), in order to check if the PLC(s) are seen on the network (in applicom solution use the explorer to start MONPFB.EXE). In case of communication problem: - if this tool does not show you some Profibus address of your remote devices, that means that the low level of the communication is not running (wiring, end resistance, Baudrate, communication timings). - if this tool shows you the Profibus address corresponding to your remote devices, that means that the issue is then located at a higher level, certainly link to parameter from the remote device configuration. (Rack, Slot, Link Type …)

You can also check the communication with configured equipments. For this use the ReadWait communication test tool Type of the needed data (bit, Byte, Word, Double Word…)

that you can start from the configuration console.

Most important parameters : Card, Channel and equipment.

2 mode types : -Standard uses the data address - Equipment descriptor uses the data syntax (Please refer to the Help file) If all works fine, you must see some return data in this array. Also, when you active the read function, you can see a return status about the exchange (0 = ok, other = not ok). Click on «read button» to read just one time and get the return status. QuickStart_PFB MPI/S7 comm with Siemens S7-300 and S7-400 PLC – V1.0 (bus fault)

If the used Mode is “Equipment descriptor” then click on it to enter the syntax. Once the syntax is chosen, it will appear above the button Number of variables to read Address of the needed data in the PLC. Click on «Stop on error» and «Polling» buttons to read and capture a nondeterministic return status. (bus fault)

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4 Communication over Data Servers – Ex with OPC client You can also test the OPC Server communication over the OPC test Client provided as additional test tool. Start it from the configuration console and the connection to the OPC server is opened automatically. You just have to add in the group the items you want to test.

To add items to read on the MPI/S7 network you can reference to the following Siemens S7 syntax table:

Note: if any problem appears during the connection to the OPC server refers to the OPC documentation and technotes.

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5 Communication Troubleshooting / FAQ 5.1 My communication status is different than 0 If the return status about the exchange is different than zero, it means that the communication to the S7 PLC is not established. Here some common status: Communication Time-out means that the S7 PLC does not respond to the request we sent. Can be related to a cable that is disconnected, or broken. 33 55

Can be a wrong Profibus address or a PLC that is not ready to run or badly configured. Please check your network wiring, connectors, Profibus address and configuration of the remote PLC, configuration set in the communication solution… Test in direct connection over Ethernet Cross Cable Use the Profibus monitor to verify the quality of the wiring (Chapter 3). Refused connection usually means a bad wire or a bad configuration of the remote stations, but also means that the S7 CPU does not accept the S7 connection. Can be a PLC CPU that is in STOP mode or OFF. Please check that the CPU is started an in RUN mode, check the Slot and Rack parameters. Check also the Profibus cable. Can be related to a connection request when the CPU does not have anymore free connections available. Each PLC is limited in the number of connection available. Refer to the following table with some samples of connection limitations or contact your PLC manufacturer.

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If this is the first connection that is not accepted, change the link type in the PLC properties windows from “Standard” to “PG” or “OP” or reduce the number of connection used by additional equipment in communication with this PLC. If you have selected more than one request simultaneously, it can be that your PLC has not enough ressources to manage all configured connections. Reduce this value to 1 Table with some exemples of connection limitations (for more information contact Siemens with the CPU reference)

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To know the meaning of status not indicated above, refer to the documentation of the Profibus protocol chapter Functions return Status

5.2 Can my BradCommunication solution configure my S7 PLC ? The Direct-Link PCNI PN# DRL-MPI-PCU and the applicom PCNIC PN# APP-PS7-PCU; PN# APP-PFB-PCU; PN# APP-PFB-CPI does not provide any specific driver for the Simatic Step 7 Software. So it is not possible configure the PLCs via these cards.

5.3 Can I communicate at the same time with other messagings? Yes, the different BradCommunication solutions allows you to use simultaneously all messagings. Depending on your configuration the solution will use the appropriate messaging (based on the Profibus stack) to send request to the PLC. The supported messagings are : - MPI, on programming port - S7 Protocol, on DP port - Profibus DP, for remote Periperals - FDL, for unsolicited sendings - S5, for Siemens S5 PLCs Note that this list change in respect to the used card. For the messaging supported by your card, please refer to the help files.

5.4 Is it better to communicate over Profibus MPI or Profibus S7? Both, Profibus MPI and Profibus S7 allows you to communicate directly with an S7-300 or S7-400 CPU. The Profibus MPI communication is performed over the CPU programming interface with a communication speed of 187,5 kBaud by default. Only few CPU can change this speed for a higher baurate. The Profibus S7 communication is performed over the 2DP port or over any Profibus interface of a Profibus coupler. Here the baudrate is not limited and the communication is possible from 9,6 kBaud to 12 MBaud. Be carefull on the Profibus S7 specific ports, additional communication like Profibus DP communication, can also be performed at the same time. Having an additional S7 communication is possible but can add some delay in the DP data refresh cycle.

5.5 What is the difference between Profibus S7/MPI and Profibus DP? The 2 main differences is in the data access : - Profibus DP protocol is an Input / Output data exchange between one Master and one slave. This communication is cyclic and very fast (ex: every 10 ms) but very limited in the amount of Data (only 244 Bytes Input and 244 Bytes Output). QuickStart_PFB MPI/S7 comm with Siemens S7-300 and S7-400 PLC – V1.0

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Profibus S7/MPI is a communication made on request by a Profibus Master to another Profibus Master. The communication is directly made with the S7 CPU, accessing to the internal memory (ex: DBxDBWy or MWz). At each request different memory address can be read allowing an exchange of very large amount of data.

5.6 Do I need particular settings for the communication with particular equipments (VIPA 315 SB, S7 318-2, S7 312) ? Yes, there are some equipments that needs adjustments for a correct communication.
For the VIPA 315 SB, It is recommended to increase the TRDY and MiN_TSDR parameters in the configuration console. As an example, at 187,5 Kbds, to communicate with this device, the configuration should be :


Using the 1,5 Kbits/s, in communication with a Siemens S7 318- 2, it is recommended to decrease the TSET parameter to 50 tbit.
With the MPI messaging, some of Siemens CPU S7 312 firmware version does not allow the DRL solution to connect through. So, if you encounter any communication trouble, you will have to change the way to communicate to. Use the S7 messaging. Do not forget to change the connexion type from “Standard” to “PG or OP”.

5.7 Where can I get further information about these topics ? QuickStart_PFB MPI/S7 comm with Siemens S7-300 and S7-400 PLC – V1.0

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More information about the Profibus communication in the help file Profibus.pdf
More information about the Product general configuration in the help file Implementation.pdf


More information about the setup of the BradCommunication Product in the Quickstart
More information about the specific topics in relation with the BradCommunication Products in various Technotes and Quicknotes. Available on the Product CD-Rom under the Technote Directory 5.8 Where can I get further Techsupport help ? The first contact for Techsupport help is your local BradCommunication supplier ! If you bougth your communication solution directly by Woodhead, please refer to the contact.pdf document in the list of help files in order to find the Woodhead office close to your location. Please ensure also that you have the following information readily available before calling for Technical Support: - Card type and serial number - Computer's make, model and hardware configuration (other cards installed) - Operating system type and version - Details of the problem you are experiencing: firmware module type and version, target network and circumstances that may have caused the problem

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