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Mitsubishi FX5U “Modbus RTU” PowerFlex 525 Tutorial

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Hello friends!
The Powerflex 525 inverter is a series of Rockwell’s 520 inverter series, which is the new generation of Component inverters from Allen-Bradley. It supports many control and Communication methods such as Ethernet/IP, RS485…

Today will guide you to use PLC Mitsubishi FX5U to control Allen-Bradley PowerFlex 525 through Modbus RTU (RS485)

FX5U & PowerFlex 525 “Connection Diagram”

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

Allen-Bradley PowerFlex 525 Modbus-RTU Setting

In addition to the basic parameters of the inverter installed according to the motor (Frequency, current, voltage…) then we need to install the following communication parameters

PowerFlex-525 Registers for Control

>>> VFD Control Address = 2000 (Hexa)

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

>>> VFD Frequency Reference Address = 2001 (Hexa)

PowerFlex-525 Registers for Monitoring
  • Frequency Command Address = 2102 (Hexa)
  • Output Frequency Address = 2103 (Hexa)
  • Output Current Address = 2104 (Hexa)
  • DC-BUS Voltage Address = 2105 (Hexa)
  • Output Voltage Address = 2106 (Hexa)

Mitsubishi FX5U Modbus RTU Configuration

So that FX5U can connect and control the inverter, we need to set the same communication parameters as Allen-Bradley PowerFlex 525 VFD.

PLC Programming

+ Communication Distribution

+ Frequency Setting & Motor Control Command

+ Read Data Response

Detailed Instruction Video


Related Software and Documents

>>> Mitsubishi GX-Works3 Software Free Download
>>> Allen-Bradley PowerFlex 525 Manual PDF Download

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Please share the article to the community if you find it useful. Please comment below the article if you need assistance in connecting FX5U to PowerFlex 525 VFD, will reply to you when I read comments.

Best Regards!

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  • Excellent instructions!! I was going to attempt using an Ethernet I/P card in our FX5 to communicate with the 525, but after coming across this, I believe I will use the ModBus setup as you illustrated. Thank you very much for sharing such detailed information.

    Shane Graham

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