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LabView “Modbus RTU” PowerFlex525 Tutorial

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PowerHello everyone!
Many people have messaged to ask how to use LabView to communicate with devices via Modbus RTU using RS485 communication. That’s why today will write a tutorial for you to do this.

The first inverter I used was the Allen Bradley PowerFlex 525 Inverter. Attention, we need to prepare 1 USB to RS485 Cable.

Computer & PowerFelex 525 “Wiring Diagram”

PowerFlex 525 Modbus RTU Parameters Setting

In addition to the basic parameters of the inverter (frequency, voltage, current), we need to set the following communication parameters:

Register for Control

>>> Motor Control Address = 8192

  • Set Word 8192 = 18 >>> Motor Forward Run
    = 34 >>> Motor Reverse Run
    = 1 >>> Stop Run
    = 8 >>> VFD Clear Error

>>> Frequency Reference Address = 8193

Register for Monitoring

LabView Modbus-RTU Programming

Front Panel

Block Diagram

Video Tutorial


References Document

+ Allen-Bradley PowerFlex 525 Manual PDF (Password Extract:

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Thanks and Best Regards!

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