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Mitsubishi FX5U “Modbus RTU” INVT Goodrive 20 Tutorial

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Hello friends!
INVT Goodrive 20 inverter is a cheap inverter originating from China, but its quality is quite good for the city. Moreover, it is easy to use and supports RS485 Communication Port.

Today will guide you to use PLC Mitsubishi FX5U to control INVT GD20 via Modbus RTU (RS485)

Mitsubishi FX5U & INVT GD20 “Wiring Diagram”

Note: Use a 120Ω terminal resistor if the communication distance is far

INVT Goodrive 20 Modbus-RTU Setting

In order for the FX5U PLC to control the INVT GD20 inverter with Modbus-RTU, we need to set the communication parameters for the inverter as below:

+ P00.01 = 2 (Communication running command)

+ P00.06 = 8 (The frequency is set by MODBUS)

+ P00.09 = 0 (Select A frequency)

+ P14.00 = 1 (Slave Number.1)

+ P14.01 = 3 (9600bps)

+ P14.02 = 1 (Digital bit checkout E,8,1 RTU)

+ P14.03 = 5 (Communication answer delay)

+ P14.04 = 0.0 (Communication overtime fault time)

Registers for Control

>>> VFD Control Address = 2000 (hex)

  • Set Word 2000 = 1 >>> Motor Run Forward
  • Set Word 2000 = 2 >>> Motor Run Reverse
  • Set Word 2000 = 5 >>> Stop

>>> Frequency Reference Address = 2001 (hex)

Registers for Monitoring

Mitsubishi FX5U Modbus RTU Configuration

We need to configure the same communication parameters as configured in the INVT GD20 Inverter

FX5U Modbus RTU Example

+ Read/Write Distribution

+ VFD Control Command

+ Read Data Response

Project Video Tutorial


Related Software and Documents

+ Download PLC FX5U Programming Software

+ Download INVT Goodrive 20 Manual PDF (Password Extract:

If you have any problems in the process of connecting Mitsubishi FX5U with INVT Goodrive.20, please comment below the article, will reply to you as soon as I read the comments.

Best Regards!

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