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Mitsubishi FX3U “Modbus RTU” INVT Goodrive 20 VFD

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Mitsubishi FX3U PLCs and INVT Goodrive 20 inverters are extremely commonly used devices in factories. Today will write a tutorial for you to connect them together via Modbus-RTU RS485 communication

I use FX3U PLC in combination with FX3U-485ADP-MB Module to make this project.

FX3U & INVT GD20 “Wiring Diagram”

If the communication distance is large, it is necessary to install an additional 120Ω terminal resistor

INVT Goodrive 20 Modbus-RTU Setting

In addition to the basic parameters of the inverter installed according to the motor used (frequency, voltage, current, acceleration), in order for the inverter to be able to communicate with Modbus-RTU, we need to set the minimum parameters. as follows:

+ P00.01: 2 (Setting Frequency via RS485)

+ P00.06: 8 (Control Run via RS485)

+ P00.09: 0 (A Frequency Selection)

+ P14.00: 1 (Slave Address)

+ P14.01: 3 (baudrate 9600bps)

+ P14.02: 1 (ModbusRTU 8/1/E)

+ P14.03: 5

+ P14.04: 0.0

FX3U Programming

+ FX3U CH2 Communication Configuration

+ Auto Read/Write Command

+ Setting Frequency Command

+ Motol Control Command

+ Data Monitoring

Installation Instruction Video


Documentation and supporting software

+ GX-Works2 for FX3U Programming

+ Download INVT Goodrive 20 Manual PDF (Password Extract:

If you need any assistance in the process of connecting Mitsubishi FX3U and INVT Goodrive 20 VFD, please comment below the article.

Best Regards!

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