Many people have messaged plc247.com to ask how to use LabView to communicate with devices via Modbus RTU using RS485 communication. That’s why today plc247.com 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
+ Allen-Bradley PowerFlex 525 Manual PDF (Password Extract: plc247.com)
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