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Mitsubishi FX3U “Modbus RTU” PowerFlex525 VFD

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Hello everyone!
Mitsubishi FX3U PLC is one of the most commonly used PLCs in the world and today I will show you how to use it to control PowerFlex525 (Allen-Bradley) Inverters

To be able to communicate with Modbus-RTU, FX3U needs to use the FX3U-485ADP-MB Module.

FX3U & PowerFlex525 “Wiring Diagram”

PowerFlex 520 Series Communication Settings

To configure the Modbus-RTU parameters we need to set the parameters as follows

Register for Control

>>> Control Run Address = 2000 (Hexa)

+ Set Word 2000 = 18 >>> Motor Forward Start
= 34 >>> Motor Reverse Start
= 1 >>> Stop
= 8 >>> VFD Fault Reset

>>> Setting Frequency Address = 2001 (Hexa)

Register for Monitoring

Mitsubishi FX3U Programming

+ FX3U Channel2 Modbus RTU Settings

+ Distribution Write/Read Automatic

+ Frequency Setting & Motor Control Run

+ Data Monitoring Read

Video Tutorial


Documentation and supporting software:

+ GX-Works2 for PLC Mitsubishi Programming
+ PowerFlex 525 Manual PDF Download (Password Extract:

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