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FX3U “Modbus RTU” Danfoss FC302 Tutorial

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Hello everyone, in previous posts used a number of PLCs, HMIs and PCs to control Danfoss FC302 inverters via Modbus RTU.

Today will continue to guide you to use an extremely popular PLC on the market, Mitsubishi FX3U to control Danfoss FC302 VFD

FX3U & Danfoss FC302 “Connection Diagram”

Danfoss FC302 Modbus RTU Configuration

In addition to the parameters installed in accordance with the motor, we need to install the following communication parameters to be able to control the inverter by Modbus RTU

FC302 Registers for Control

>>> VFD Control Command = C34F (hex)

+ Set Word C34F = 47C (hex) >>> Run Forward
= 847C (hex) >>> Run Reverse
+ Set Word C34F = 43C (hex) >>> Stop
+ Set Word C34F = 4BC (hex) >>> VFD Reset

>>> Speed Reference Address = C359 (hex)
+ Speed Reference = 0 to 16384(dec) ~ (0 to 100%)

FC302 Modbus for Monitoring
Note: Danfoss FC302 Address = “(Table Address*10) – 1
  • Voltage Output Address = 16119
  • Frequency Output Address = 16129
  • Current Output Address = 16139
  • Speed Output Address = 16169

PLC Programming

+ FX3U Modbus RTU Configuration

+ Write / Read Distribution

+ VFD Control Command

+ Read Data Response

Project Video Tutorial


Related Software and Documents

+ GX-Works2 for PLC Mitsubishi Programming
+ Danfoss FC302 Manual PDF Download

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