Application

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Introduction to MP-Bus Technology # Tools-009-E-4

Table of Contents 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13.

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Introduction to MP-Bus Technology Network topologies for MP-Bus Sensor linking Connection on the MP Master MP-Bus cable MP-Bus cable lengths Override operation functions with MP-Bus operation Special MP-Bus application: bus wiring for connecting the PC-Tool for diagnostics and maintenance of VAV-Compact xMV-D2-MP MP accessory devices Bus fail positions adjustable with PC-Tool V3 Diagnostics on a MP network with the PC-Tool MFT-P Diagnostics on a MP network with the ZTH-VAV as MP-Bus tester MP specifications

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MP-Bus Technology

Table of Contents 1. 2. 3. 4.

5. 6.

7.

8. 9.

10. 11.

12. 13.

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Introduction to MP-Bus Technology Network topologies for MP-Bus Sensor linking 3.1 Sensor connection on MFT or MP/MFT2 actuators Connection on the MP Master 4.1 Data exchange between master and slave 4.2 Connection to an MP Cooperation Node 4.3 Connection to an MP Gateway MP-Bus cable MP-Bus cable lengths 6.1 Cable lengths with AC 24 V and DC 24 V 6.2 Cable lengths with on-site supply 6.2.1 Mains device for ZN230-24MP for local on-site supply Override operation with MP-Bus 7.1 Restrictions 7.2 Wiring diagram for override operation with a MP gateway 7.3 Wiring diagram for override operation with MP cooperation nodes 7.4 Wiring diagram for override operation with one ZN230-24MP for DC 24 V Special MP-Bus application: bus wiring for connecting the PC-Tool for diagnostics and maintenance of VAV-Compact xMV-D2-MP MP accessory devices 9.1 ZN230-24MP 9.2 BKN230-24MP 9.3 ZIP-USB-MP 9.4 ZIP-RS232 9.5 ZIP-232-MP 9.6 MP I/O Module UST-3 from BV-Control 9.7 MP-Bus combination sensor PTH from BV-Control Bus fail positions adjustable with PC-Tool V3 Diagnostics on a MP network with the PC-Tool MFT-P 11.1 MP-Master simulation 11.1.1 MP-Bus scan 11.1.2 Recording a trend 11.1.3 Wiring diagrams 11.2 MP-Bus monitoring 11.2.1 Analysis with the MP monitor 11.2.2 Wiring diagrams Diagnostics on a MP network with the ZTH-VAV as MP-Bus tester MP specifications 13.1 Brief description of communications 13.2 MP signal level 13.3 Query interval

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MP-Bus Technology

1. Introduction to MP-Bus Technology The MP-Bus is the BELIMO master/slave bus. Up to 8 slaves can be connected to a MP master unit: MP/MFT(2) damper actuators, MP/MFT(2) valve actuators, MP fire damper actuators and MP VAV devices.

2. MP-Bus network topologies There are no restrictions with respect to network topology. Permissible topologies include star, ring, tree and mixed configurations. Slave

MP-Master

Slave

Slave

Slave Slave

Slave

Slave Slave

Slave

MP-Master

Slave Slave

Slave

Slave Slave

Slave

Slave

MP-Master

Slave

Slave

Slave

Slave

Slave

Slave

Slave

Slave

3. Sensor linking One sensor can be connected per MP/MFT(2) actuator in MP-Bus operation. The sensor value is recorded by the actuator and transmitted in digital form via MP-Bus. The scaling and evaluation of the sensor value takes place in the MP Master. Active sensors (output DC 0 ... 10 V) and ON/OFF switches can be connected to the MFT actuators. In addition, passive resistance sensors (e.g.: Pt 1000) can be connected to the MP/ MFT2 actuators. MP-Master

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S

Slave

Slave

S

S

Slave

Slave

S

S

Slave

Slave

S

S

Slave

Slave

S

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3.1 Sensor connection on MFT or MP/MFT2 actuators

active sensor

MP / MFT2 actuators

AC 24 V DC 24 V

passive sensor

switch

active sensor

~ T

MFT actuators

MP-Bus

switch

∆p

∆p

Max. 8 actuators and sensors 1

2

3

5

1

2

3

1

5

2

3

5

Sensor Module

1

2

3

5

1

Sensor Module

2

3

5

Sensor Module

4. Connection to MP Master Up to eight MP/MFT(2) actuators can be controlled by one MP master via the MP-Bus. MP masters are MP cooperation nodes (SPS or DDC controllers with MP interface) or MP Gateways (for linkage with a field bus system). The BELIMO PC-Tool MFT-P is also an MP master.

4.1 Data exchange between master and slave The data transmitted between the MP master and slave is dependent on the MP master and on the type of the actuator. The overview shows the typical data exchange for each actuator category. Actuator category

Transmission values to the actuator

Response values from the actuator

Dampers and valves Setpoint 0..100% Override OPEN, CLOSED, MIN, MID, MAX Fault reset

Relative position/stroke in % Absolute position/stroke in ° or mm Sensor value Fault message 1) Operating status (e.g. disengagement push-button) Min/Max limits

Fire dampers

Override OPEN, FAST_CLOSED Fault reset Test run

Position switch S1/S2 Fault message 2)

VAV

Setpoint 0..100% (Vmin..Vmax) Relative volume flow in % Override OPEN, CLOSED, VMIN, VMID, VMAX Relative position in % Fault reset Absolute volume flow m3/s Sensor value Fault message 1) Operating status (e.g. disengagement push-button) Min/Max limits

Fault messages are: 1) Mechanical overload, range increased, Stop&Go ratio 2) Mechanical overload, range increased, duct temperature too high, smoke detector triggered, safetyrelevant fault and others.

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MP-Bus Technology

4.2 Connection to a MP Cooperation Node MP interface

DDC 24 V MP

~/+ MP

MP-Bus

MP-Bus

4.3 Connection to a MP Gateway

LonWorks T

24 V

~

-

AC 24 V

+ DC 24 V

~/+

MP

MP-Bus

MP-Bus

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MP-Bus Technology

5. MP-Bus cable Communication and supply for the MP-Bus can be carried in the same cable. The voltage supply of the MP/MFT(2) actuators is secured with GND and AC or DC 24 V. The MP master communicates with the connected actuators via the MP communications wire, which is referenced to the same GND as the voltage supply. Supply AC/DC 24 V

MP Master

~/+

~/+

~/+

T

~/+

T

T

MP

MP

Neither special cables nor terminating resistors are required. An MP-Bus connection can be set up with commercially available installation cables. Special bus cables are, however, available for simplified wiring. Example

Flat ribbon cable made by Woertz with adapter piece for MP-Bus connection by MP/MFT(2) actuators and sensors. MP actuator

M

M

S

sensor

ble s ca

Bu

Woertz AG Postfach 948 CH - 4132 Muttenz Telephone: Fax: E-Mail: Web site:

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+41 61 466 33 33 +41 61 461 96 06 [email protected] www.woertz.ch

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MP-Bus Technology

6. MP-Bus cable lengths The cable length of an MP network is limited: • by the sum of the consumption data of the connected MP/MFT(2) actuators • by the type of supply (AC by bus / DC by bus / AC locally) • by the cable cross-section

6.1 Cable lengths with AC 24 V and DC 24 V Maximum cable length for AC 24 V supply

Maximum cable length for DC 24 V supply

L = max. cable length [m]

L = max. cable length [m]

Gn d AC 24 V

DC 24 V

AC 24 V

Gn d DC 24 V

MP 1

5

MP master MP-Master UK24-LON

MP 1

2

5

1

2

5

1

2

5

Actuator

Actuator

Actuator

1

2

8

Total power rating MP/MFT(2) actuators [VA]

1 5

MP master MP-Master UK24-LON

1

2

5

1

2

5

Actuator

Actuator

1

2

8

Cable length vs active power applies to DC supply (minimum supply voltage DC 24.0 V)

1.0 mm2 2.5 mm2



0.75 mm2 1.5 mm2

1.0 mm2 2.5 mm2

Active power [W]

Power rating [VA] !

5

Cable length [m]

0.75 mm2 1.5 mm2

Cable length [m]



2

Total power consumption MP/MFT(2) actuators [W]

Cable length vs power rating applies to AC supply (minimum transformer voltage AC 21.6 V)

1

Actuator

In the case of the NVF24-MFT2, the power rating must be multiplied by a Factor of 2.

Cable length vs active power applies to DC supply (minimum supply voltage DC 24 V)

Calculation of the maximum cable lengths The power ratings [VA] of the MP/MFT(2) actuators used are to be added, and the corresponding cable lengths are to be read from the diagram.

Calculation of the maximum cable lengths The power consumption [W] of the MP/MFT(2) actuators used is to be added, and the corresponding cable lengths are to be read from the diagram.

Example: The following is connected to the MP-Bus: 1 pc. NM24A-MP, 1 pc. SM24A-MP, 1 pc. LMV-D2-MP… and 1 pc. NV24-MFT2

Example: The following is connected to the MP-Bus: 1 pc. NM24A-MP, 1 pc. SM24A-MP, 1 pc. LMV-D2-MP… and 1 pc. NV24-MFT2

Total power rating: 5.5 VA + 6 VA + 5 VA + 5 VA = 21.5 VA

Total power rating: 3.5 W + 4 W + 3 W + 3 W = 13.5 W

To be read out from the mass of curves: • After cables with wire Ø 0.75 mm2: Cable length 28 m • After cables with wire Ø 1.0 mm2: Cable length 35 m • After cables with wire Ø 1.5 mm2: Cable length 50 m • After cables with wire Ø 2.5 mm2: Cable length 90 m

To be read out from the mass of curves: • After cables with wire Ø 0.75 mm2: Cable length 55 m • After cables with wire Ø 1.0 mm2: Cable length 75 m • After cables with wire Ø 1.5 mm2: Cable length 110 m • After cables with wire Ø 2.5 mm2: Cable length 190 m

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6.2 Cable lengths with on-site supply If the actuators are supplied with AC 24 V locally via a separate transformer, the cable lengths can be significantly increased. Cable lengths remain in accordance with the table, independent of the power rating of the actuators connected and independent of the wire ∅ of the MP wiring. L = max. cable length [m] AC 24 V

AC 24 V Gnd MP 1 5 MP master

Wire-∅ [mm2] 0.75 1 1.5 2.5

1 2 5 Actuator

1 2 5 Actuator

1 2 5 Actuator

1

2

8

L = max. cable length [m] 800

6.2.1 Mains device ZN230-24MP for local on-site supply The on-site supply can be accomplished with any commercially available transformer. BELIMO offers a device which is specially suited for on-site supply. The MP/MFT(2) actuators are supplied locally with AC 24 V by the ZN230-24MP. This permits the implementation of long MPBus lines. When the ZN230-24MP is utilised, the MP-Bus is comprised solely of a 2-wire line (GND and MP). Sensors can be linked with the MP/MFT(2) actuators via ZN230-24MP. The MFT parameterising device PC-Tool MFT-P can also be linked with the MP/MFT(2) actuator via ZN230-24MP. Communications with the MP network are disconnected as soon as an MFT parameterising device is plugged in at the "Tool" socket. This ensures that data collisions will be prevented.

.. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .

A USB 2.0 cable with an A to B connector is supplied with the ZIP-USB-MP

3 pole

Sensor 0 ... 50°C output DC 0 ... 10 V

ZKS-MP (is supplied with the ZIP-RS232)

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MP-Bus Technology

7. Override operation with MP-Bus It is possible to have override functions act locally on the MP/MFT(2) actuator while it is running on the MP-Bus, i.e. while it is being digitally controlled by the UK24LON - or by a DDC cooperation node via the MP-Bus. 7.1 Restrictions Caution! If the possibility of sensor linkage is used, then the analogue override functions will be switched off.

Note for VAV-Compact xMV-D2-MP

• The analogue overrides only work if the actuator is supplied with AC 24 V. • The overrides can only be used if the sensor integration on the same MP/MFT(2) actuator is not used at the same time. The following settings must be carried out with the PC-Tool MFT-P on the VAV-Compact xMVD2-MP in order to ensure that the override operations function in accordance with the following connection diagram: • Set CAV function to NMV-D2M-compatible • Set mode to 2 ... 10 V

7.2 Wiring diagram for override operation with a MP gateway Example

Analogue override operation in connection with an application with the UK24LON gateway.

Note When the max. position setting in the actuator is configured to 100 % (factory setting), the actuator also opens fully, if there is AC 24 V at terminal 3. Such cases do not require a diode to move the actuator into the override open position. A diode is however mandatory to open the damper completely with the VAV-Compact ..D2-MP. In the case of the ..D2-MP, the maximum position setting corresponds to the volume flow max.

Bus mode

OPEN * Max CLOSED

* Not available with DC 24 V supply.

additional actuators (total of 8)

..A-MP, ..D2-MP, ..MFT(2) actuator

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..A-MP, ..D2-MP, ..MFT(2) actuator

..A-MP, ..D2-MP, ..MFT(2) actuator

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MP-Bus Technology

7.3 Wiring diagram for override operation with MP cooperation nodes Analogue override operation with an application with a DDC MP cooperation node.

AC 24 V

GND

Bus mode

OPEN * Max CLOSED

AC 24 V

T

* Not available with DC 24 V supply.

~

Example

DDC controller GND AC 24 V

T

T

~

..A-MP, ..D2-MP, ..MFT(2) actuator

2

~

+

1

_

+

3

5 U5 MP

1

2

T

5 U5 MP

~

_

3

_

..A-MP, ..D2-MP, ..MFT(2) actuator

+

3

1

5 U5 MP

2

3

5

U5 _ + MP ..A-MP, ..D2-MP, ..MFT(2) actuator T

2

~

1

..A-MP, ..D2-MP, ..MFT(2) actuator

MP

additional actuators (total of 8)

7.4 Wiring diagram for override operation with ZN230-24MP with DC 24 V Example

Analogue override operation with an application with a DDC MP cooperation node to DC 24 V supply. The analogue override operation of the actuator will nevertheless be possible as a result of the AC 24 V provided by the MP supply device ZN230-24MP.

DDC controller

S1

GND AC 24 V Ya MP Yb AC 24 V GND

AC 230 V

GND MP

Tool

1

2

5

3

DC 24 V

GND

~

T

_

ZN230-24MP

U5

+

MP

additional actuators (total of 8)

OPEN

MP1

Max CLOSED Bus mode

xx24-MFT(2)

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MP

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MP-Bus Technology

8. Special MP-Bus application: Bus wiring for connecting the PC-Tool for diagnostics and maintenance of VAV-Compact xMV-D2-MP The VAV controllers are conventionally activated with a 0 ... 10 V signal from the temperature controller. The individual xMV-D2-MPs are addressed with an MP address, in order to ensure that they can be periodically checked with the BELIMO PC-Tool via MP-Bus. Advantage of this application

Disadvantage of this application

Note The PC-Tool must be exited after an xMV-D2-MP has been accessed via MP-Bus with the PCTool, because otherwise no error-free analogue operation can be guaranteed.

The desired xMV-D2-MP can be accessed with the PC-Tool from a central location, e.g. from the control cabinet. This makes it possible to check the functioning of the VAV controllers in simple fashion. Because of the fact that the xMV-D2-MPs are addressed, U5 is not available as analogue voltage 2 ... 10 V, which displays the current volume flow (%Vnom). This means that master/ slave wiring is not possible.

A USB 2.0 cable with an A to B connector is supplied with the ZIPUSB-MP

Zone 1

white = GND blue = not connected green = MP

Zone 2

Zone 3

Zone 4

.. .. .. .. .. .

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MP-Bus Technology

9. MP accessory devices 9.1 ZN230-24MP MP supply device for on-site supply. The ZN230-24MP is used for MP applications in connection with general damper adjustment and valve applications. The device is described under 6.2.1 and 7.4. 9.2 BKN230-24MP The BKN230-24MP is identical in construction to the ZN230-24MP, with features for connecting bus-capable BF(G)24TL-T-ST fire damper actuators and smoke switch contact (optional).

9.3 ZIP-USB-MP The ZIP-USB-MP is a potential-free interface between the USB port on a PC and the BELIMO MP-Bus. A driver must be installed on the PC in order to use the ZIP-USB-MP. This driver can be downloaded from the BELIMO website (Download section). The device has a slide switch which is used to switch from master to monitor mode. Application

The ZIP-USB-MP is used for parameterizing MP/MFT(2) actuators or analysing MP-Bus networks with the BELIMO PC-Tool. The ZIP-USB-MP is supplied with voltage by the USB port. No external power supply is required. This interface is galvanically separated.

9.4 ZIP-RS232 The ZIP-RS232 is an interface between the RS232 port on a PC and the MP-Bus from BELIMO. Application

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The actuators can be connected in simple fashion using the pressure clamps for the configuration, parameterization or check of the actuators with the BELIMO PC-Tool. In addition, installations with UK24LON or other MP-Bus master devices can be accessed via ZIP-RS232. This interface is galvanically separated.

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MP-Bus Technology

9.5 ZIP-232-MP ZIP-232-MP for the level conversion between an RS232 interface and the BELIMO MP-Bus. The device is suitable for control cabinet installation. Application

MP master devices with RS232 interface (e.g. PC's) which have implemented the BELIMO MP protocol, but which have no MP level converter of their own, can be connected with the MP-Bus via ZIP-232-MP. This interface is not galvanically separated.

9.6 MP I/O Module UST-3 from BV-Control The MP I/O module is manufactured and sold by the company BV-Control (Switzerland). The module is used in situations where analogue or digital signals from/to field devices such as sensors, switches, frequency converters, circuit breakers, etc. are to be connected on the MPBus. The module is used in connection with a DDC controller with MP-Bus interface (MP-cooperation node). A corresponding MP command list is provided by BV-Control for the purpose of implementing the MP commands required for the module in the DDC controller at the software level. • 3 potential-free relay switching outputs for switching power of up to 230 V AC / 3 A. • 1 analogue output 0 ... 11 V / 4 mA. • 1 resistance measurement 0 ... 150 k� (for passive sensors Ni1000, Pt1000, NTC). Alternate configuration also possible as analogue input 0 ... 11 V. • 3 digital inputs for potential-free contacts. • One of which can be configured alternatively as a 0 ... 11 V analogue input. The UST-3 is connected together with up to 7 additional MP-Bus nodes (MP/MFT(2) actuators, MP-I/O Module UST-3 or MP sensors) to an MP network and is assigned a corresponding MP address (MP1 ... MP8). BV-Control Bruechstrasse 27 CH - 8706 Meilen Switzerland Telephone: +41 - 44 - 923 79 25 Fax: +41 - 44 - 790 15 70 E-Mail: [email protected]

BV-C UST-3 Input/OutputR1 R2 R3 Tx/Rx

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MP-Bus Technology

9.7 MP-Bus combination sensor PTH from BV-Control The company BV-Control has a combination sensor for pressure, temperature and humidity in its product line that can be connected to an MP network as an autonomous MP-Bus node. The necessary MP commands must be implemented in the MP master in order for the MP master to be able to operate the combination sensor as an MP slave (node), i.e. to read out pressure, temperature and humidity. The corresponding list of MP commands is available from BV-Control. Supply AC/DC 24 V

MP master

~/+

~/+

~/+ T

T

MP

MP

BV-Control Bruechstrasse 27 CH - 8706 Meilen Switzerland Telephone: +41 - 44 - 923 79 25 Fax +41 - 44 - 790 15 70 E-Mail: [email protected] 10. Bus fail positions adjustable with PC-Tool V3 Note The actuator supply must be secured for this function.

Typical application

Bus fail position

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So-called bus fail positions can be set with the PC-Tool for the actuators of the new generation (MP types). This makes it possible to define how the actuator should behave in the event that it detects that its communication to the MP master is missing (if communication is interrupted, then the actuator will detect this within one minute's time.). A valve can, for example, be opened completely in the event of bus failure (frost protection).

Actuator type

Possible bus fail positions, adjustable with PC-Tool

Setting at the time of delivery (factory setting)

..24A-MP

• Last value (actuator stops) • Open (actuator opens up entirely) • Close (actuator closes entirely) • Fast close (actuator closes entirely)

• Last value (actuator stops)

..MV-24A-MP

• Last value (control operation) • Open (actuator opens up entirely) • Close (actuator closes entirely) • Min / min • Max / max

• Last value (control operation)

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MP-Bus Technology

11. Diagnostics on a MP network with the PC-Tool MFT-P 11.1 MP Master simulation The PC-Tool will be used as an MP master in the event that an MP master device (MP master DDC controller or MP master gateway) is to be simulated. The functioning of all of the actuators which are connected to the MP-Bus can be checked. This checking also includes the readout of the connected sensors. Typical functions that can be selected in the PC-Tool MFT-P: • Default entry of nominal values via MP-Bus • Readout of the sensors that are connected to the MP actuators • Recording of graphic trends • MP-Bus scan 11.1.1 MP-Bus scan After startup, the PC-Tool checks the MP network with the bus scan function and displays all of the MP slave devices that are integrated into the MP-Bus network.

11.1.2 Recording a trend One passive sensor is connected to an LM24A-MP actuator. 1 = Setpoint actuator 2 = Actual value of actuator 3 = Sensor value

3 1

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11.1.3 Wiring diagrams Wiring diagram 1 A USB 2.0 cable with an A to B connector is supplied with the ZIP-USB-MP

Note The PC-Tool is the MP Master. The connection is made with the connection cable ZK2-GEN. The MP connection to the master must be disconnected.

MP-Master

Pos. MA = Master

RJ11 (4/6)

Enable Data Initialized

USB

MO

Belimo PC-Tool

USB

DDC Controller UK ... Gateway

ZK2-GEN

MA

USB

GND 24 V MP

white = GND blue = not connected green = MP

ZIP-USB-MP

GND

MP

MP 24 V ┴

Further actuators and sensors (max. 8)

∆p

1

2

3

5

1

2

3

1

5

2

3

... A-MP

... A-MP

... A-MP

... D2-MP

... D2-MP

... D2-MP

... MFT (2)

... MFT (2)

... MFT (2)

5

Wiring diagram 2 Note The PC-Tool is the MP Master. The connection is made with the connection cable ZKS-MP. UK24LON / EIB A USB 2.0 cable with an A to B connector is supplied with the ZIP-USB-MP

MFT-H

LonTalk a b

Power 0V 24 V n.c .

MP-Com. 0V 24 V Y U /MP

Pos. MA = Master

MA

USB

USB

3 pol

ZIP-USB-MP

AC 24 V DC 24 V

USB

T

MO

Enable Data Initialized

~

Belimo PC-Tool

_ +

ZKS - MP

Further actuators and sensors (max. 8)

MP 24 V ┴ ∆p

1

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2

3

5

1

2

3

5

1

2

3

... A-MP

... A-MP

... A-MP

... D2-MP

... D2-MP

... D2-MP

... MFT (2)

... MFT (2)

... MFT (2)

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MP-Bus Technology

11.2 MP-Bus monitoring The PC-Tool will be used as an MP monitor in the event that the communications of an MP network (communication between an MP master and its MP slaves) are to be checked. The switch of the ZIP-USB-MP must be set to Monitor "MO" position for the analysis at the MP-Bus. 11.2.1 Analysis with the MP monitor Example

3 actuators (slaves) communicate with the MP master on the MP-Bus.

11.2.2 Wiring diagrams Wiring diagram 1 A USB 2.0 cable with an A to B connector is supplied with the ZIP-USB-MP

MP-Master

Pos. MO = Monitor

RJ11 (4/6)

Belimo PC-Tool

USB

USB

DDC Controller UK ... Gateway

ZK2-GEN

MA

USB

Enable Data Initialized

MO

Note • The PC-Tool is the MP Master. The connection is made with the connection cable ZK2-GEN. • The mode switch must first be set to “MO” before the MP Monitor module can be started up in the PC-Tool.

GND 24 V MP

white = GND blue = not connected green = MP

ZIP-USB-MP

GND

MP

MP 24 V ┴

Further actuators and sensors (max. 8)

∆p

1

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2

3

5

1

2

3

5

1

2

3

... A-MP

... A-MP

... A-MP

... D2-MP

... D2-MP

... D2-MP

... MFT (2)

... MFT (2)

... MFT (2)

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11.2.2 Wiring diagrams (continued) Wiring diagram 2

UK24LON / EIB A USB 2.0 cable with an A to B connector is supplied with the ZIP-USB-MP

MFT-H

LonTalk a b

Power 0V 24 V n.c .

MP-Com. 0V 24 V Y U /MP

Pos. MO = Monitor

MA

USB

USB

3 pol

ZIP-USB-MP

AC 24 V DC 24 V

USB

T

MO

Enable Data Initialized

~

Belimo PC-Tool

_ +

ZKS - MP

MP 24 V ┴

Further actuators and sensors (max. 8)

∆p

1

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2

3

5

1

2

3

5

1

2

3

... A-MP

... A-MP

... A-MP

... D2-MP

... D2-MP

... D2-MP

... MFT (2)

... MFT (2)

... MFT (2)

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MP-Bus Technology

11. Diagnostics on a MP network with the ZTH-VAV as MP-Bus tester The VAV adjustment device ZTH-VAV enables efficient testing of VAV and CAV systems. A MPBus tester is integrated as an auxiliary function which checks the following items: • Power supply on MP-Bus • Determination of active nodes (slaves) • Determination of non-activated nodes (slaves) • Determination of non-responding nodes (slaves) • Evaluation of data communications (number of telegrams and error rate) • Determination of the MP signal level (High/Low) Precondition

Connection and supply

The MP master must communicate actively with all of the connected slaves, i.e. the slaves must receive MP commands (requests) periodically from the master, in order to have complete inspection of the MP trunk. If the MP master is not present, then the BELIMO PC-Tool can be utilised in scan mode. A scanning interval of 15 seconds is recommended for meaningful diagnostics.

The connection is made in the control cabinet or at any random location on the MP-Bus. ZTH-VAV Daten Ok: 10378 Fehler: MP3=13

OK

MP6 MP7 MP1 MP8 MP-Master MP4

MP5 MP2

Procedure

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MP3

It is recommended that the MP-Bus tester be first clamped to the MP cable at the control cabinet. If necessary, the inspection can be repeated at various positions on the MP cable.

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MP-Bus Technology

13. MP specifications 13.1 Brief description of communications Communication Data transfer Communication parameters Number of nodes on the MP-Bus

Master-Slave The slave (MP/MFT(2) actuator) responds only to commands from the MP master Bidirectional, half-duplex Communication takes place via the U5 connector, referenced to GND. 1200 baud, 8 data bits, 1 start bit, 1 stop bit, no parity The communication protocol is enabled for 1 MP master and 1 ... 8 slaves (MP/MFT(2) actuators).

13.2 MP signal level A1 2,00 V

10,0 m/s

0V Command

Answer

Measuring conditions

min

type

max

unit

11

12.5

18

V

Voltage level low Command

1

2.5

V

Voltage level low Answer

4

4.5

V

At least one MP/MFT(2) actuator is connected to the MP master. All signals are measured across U5 and GND. Voltage level high Command and Answer

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A9 - 0001

MP-Bus Technology

13.3 Query interval The more actuators there are to be served on the bus and the more sensors there are to be read at the MP/MFT(2) actuators, the longer the query intervals will be on the BELIMO MP-Bus. The cycle times that result on the MP-Bus are displayed in the curve below. 8 actuators without sensors 8 actuators with sensors

8 7 6

Time / s

5 4 3 2 1 0 1

2

3

4

5

6

7

8

Actuators

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MP-Bus Technology

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MP-Bus Technology

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