Danfoss MCD Modbus Module Operating guide
MCD Modbus Module Instructions |
Important User Information |
INSTALLATION INSTRUCTIONS: MCD MODBUS MODULE
Order Code: 175G9000
1. Important User Information
Observe all necessary safety precautions when controlling the soft starter remotely. Alert personnel that machinery may start without warning.
It is the installer's responsibility to follow all instructions in this manual and to follow correct electrical practice.
Use all internationally recognised standard practice for RS-485 communications when installing and using this equipment.
2. Installation
CAUTION
Remove mains and control voltage from the soft starter before attaching or removing accessories. Failure to do so may damage the equipment.
2.1.Installation Procedure
1.Remove control power and mains supply from the soft starter.
2.Attach the Modbus Module to the starter as shown.
3.Apply control power to the soft starter.
2.2.Physical installation
1.Fully pull out the top and bottom retaining clips on the module.
2.Line up the module with the comms port slot.
3.Push in the top and bottom retaining clips to secure the module to the starter.
Remove the MCD Modbus Module using the following procedure:
1.Take the module off-line.
2.Remove control power and mains supply from the soft starter.
3.Disconnect all field wiring from the module.
4.Fully pull out the top and bottom retaining clips on the module.
5.Pull the module away from the soft starter.
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MG17F702 - VLT® is a registered Danfoss trademark |
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Installation |
MCD Modbus Module Instructions |
2.3. Adjustment
Network communication parameters must be set on the Modbus Module. DIP switch settings take effect on the power-up of the Modbus Module via the soft starter.
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Protocol |
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Address |
A |
Baud rate |
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Parity |
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Timeout (seconds) |
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DIP switch |
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Example: Address = 24 |
B
177HA262.12
2.4. Master Configuration
For standard Modbus 11-bit transmission, the Master must be configured for 2 stop bits with No Parity and 1 stop bit for odd or even parity.
For 10-bit transmission, the Master must be configured for 1 stop bit.
In all cases, the Master baud rate and slave address must match those set on the Modbus Module DIP switches.
MG17F702 – VLT® is a registered Danfoss trademark |
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MCD Modbus Module Instructions |
Connection |
3. Connection
MCD 200: For the MCD Modbus Module to accept serial commands, a link must be fitted across terminals A1-N2 on the soft starter.
In order for the MCD 500 to accept commands from the serial network, the soft starter must be in Auto On mode and links must be fitted to terminals 17, 18 and 25, 18.
In Hand On mode, the starter will not accept commands from the serial network but the starter's status can still be monitored.
MCD 200
A1
N2
+ GND - B8 B7 B6
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MCD 500
17
18 
25
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+ GND - |
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B8 |
B7 |
B6 |
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MCD 200 |
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MCD 500 (Auto On mode) |
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MCD Modbus Module – RS-485 serial port |
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17, 18: Stop |
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RS-485 connection onto Modbus network |
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25, 18: Reset |
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MCD Modbus Module – RS-485 serial port |
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RS-485 connection onto Modbus network |
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N.B.!:
If MCD 500 parameter 3-2 Comms in Remote is set to Disable Comms in Remote, the starter will not accept start or stop commands from the serial network (the starter will still accept reset commands and allow status monitoring).
4. LEDs
The Network Status LED (1) indicates the state of the communications link between the module and the network. LED operation is as follows:
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Off |
No connection or soft starter not powered up |
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On |
Communication active |
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Flashing |
Communication inactive |
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N.B.!:
If communication is inactive, the soft starter may trip if the Communications Timeout function has been set on the module. When communication is restored, the soft starter will require a Reset.
MG17F702 - VLT® is a registered Danfoss trademark |
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Modbus Functions |
MCD Modbus Module Instructions |
5. Modbus Functions
The Modbus Module supports the following Modbus functions:
03 Read multiple registers
06 Write single register
16 Write multiple registers
Modbus broadcast functions are not supported.
MCD 200 soft starters (including Remote Operator):
Read multiple registers 40003 to 40008
Write single register 40002 MCD 500 soft starters:
Read multiple registers starting from 40003 up to a maximum of 119 register blocks.
Single write register 40002 or multiple write registers 40009 to 40599.
N.B.!:
A multiple read across register boundary 40008/40009 will result in a Modbus Error code 05 at the Master.
MG17F702 – VLT® is a registered Danfoss trademark |
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