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PLC Omron “Modbus RTU” Danfoss FC302 Tutorial

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Hello everyone, Omron PLC originates from Japan but it is used in many parts of the world, low price and high quality is the advantage of PLC Omron.

Today would like to guide you to use Omron CP Series PLC in combination with Module CP1W-CIF11 (or CP1W-CIF12) to control Danfoss FC302 inverter through Modbus RTU

PLC Omron & Danfoss FC302 “Wiring Diagram”

Danfoss FC302 Modbus RTU Configuration

To be able to control Danfoss FC302 inverter with Modbus RTU, we need to set the following communication parameters

Registers for Control
  • VFD Control Address = C34F (hex)

+ Set Word 49999 = 1148 (dec) >>> Run Forward
= 33916 (dec) >>> Run Reverse
+ Set Word 49999 = 1084 (dec) >>> Stop
+ Set Word 49999 = 1212 (dec) >>> VFD Reset

  • VFD Speed Address = C359 (hex)
    Speed Reference = 0 to 16384(dec) ~ (0 to 100%)
Registers for Monitoring
Note: Danfoss FC302 Monitoring Address
= “(Table Address*10) – 1
  • Voltage Output Address = 16119
  • Frequency Output Address = 16129
  • Current Output Address = 16139
  • Speed Output Address = 16169

PLC Omron Modbus-RTU Setting

We need to set the Modbus communication parameters the same as those of Danfoss FC302

CP1H Modbus Programming

+ Reset Control when PLC Start

+ Transmission Distribution

+ Speed Setting Command

+ VFD Control Command

+ Read Data Response

Project Video Tutorial


Recommended software and documentation:

+ Download CX-Programmer for PLC Omron Programming
+ Download Danfoss FC302 Manual PDF

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