Hello everyone.
PLC Siemens S7-1200 and Inventer PowerFlex525 are two devices that are used a lot in European and American machines. Its quality is not to say much, and today plc247.com will guide you to connect them together.
plc247.com uses the Modbus-RTU communication standard. We need to use an additional RS485 expansion module, which is S7-1200 CB1241 (or S7-1200 CM1241) to connect to PowerFlex525.
S7-1200 & PowerFlex525 “Wiring Diagram”
Power Flex525 VFD Modbus-RTU Settings
In order for the inverter to be controlled by Modbus RTU, we need to configure the following parameters
Motor Control Register Address
>>> Control Address = 40001 (dec) + 8192 (dec) = 48193
+ Set Word 48193 = 0000.0000.0001.0010 = 18 (dec) >>> Motor Forward Run
= 0000.0000.0010.0010 = 34 (dec) >>> Motor Reverse Run
= 0000.0000.0000.0001 = 1 (dec) >>> Motor Stop
>>> Frequency Setting Address = 40001 (dec) + 8193 (dec) = 48194
Monitoring Register Address
Siemens S7-1200 Modbus-RTU Settings
Configuration Module S7-1200 CB1241
Create PLC Data Types
Create Data Block
S7-1200 Modbus-RTU Programming
+ Read and Write Distribution
+ Communication Configuration
+ Frequency Setting Command
+ Motor Control Command
+ Data Monitoring Read
Detailed Installation Instruction Video
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Required software and documentation:
+ TIA Portal Software for S7 1200 Programming
+ Allen-Bradley PowerFlex 525 Manual PDF
Password Extract: plc247.com
If you need assistance with any problem in using PLC S7-1200 to control PowerFlex525 VFD, please comment below the article.
Thanks and Best Regards!
You are my hero, man!
thanks sir
Just starting to learn this, have the same setup with a Powerflex 523, but can’t get the VFD to communicate, does the CM1241need to have with the latest firmware. Unplugging the RJ45 connector to VFD does not cause a fault so there’s something on the VFD but check over the settings are correct. PLC is Tx just not receiving, what am I missing here?
I think you have misconfigured the VFD.