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PLC Inovance “Modbus RTU” PowerFlex 525 Tutorial

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Hello friends!
In previous posts, showed you how to use PLC Inovance to connect and control many different types of inverters, today I will continue to guide you to control the Alen-Bradley PowerFlex525 inverter through “Modbus RTU” protocol.

Both the Inovance H3U-3232MT PLC and the Danfoss FC51 inverter have a built-in RS485 port that can support “Modbus RTU” communication.

PLC Inovance & PowerFlex 525 “Wiring Diagram”

PLC Inovance “Modbus RTU” Parameters Setting

To be able to control PowerFlex 525 inverter with Modbus-RTU, in addition to the basic parameters of the inverter (frequency, voltage, current …) we need to install additional communication parameters as follows:

PowerFlex 525 “Modbus-RTU” Registers Address

>>> Motor Control Address = 2000 (Hexa)

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

>>> Frequency Setting Address = 2001 (Hexa)

+ 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)

PLC Inovance Modbus-RTU Configuration

We have set up Modbus communication parameters for PowerFlex 525 inverter, we also set up for PLC Inovance H3U-3232MT the same.

PLC Programming

+ Add Modbus Configuration

+ Address Config & Programming

Project Video Tutorial



+ PLC Inovance Programming Software Download
+ Allen-Bradley PowerFlex 525 Manual PDF Download

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