Siemens S7-1200 "Modbus RTU" PowerFlex525 VFD

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.

Siemens S7-1200 Control Servo Mitsubishi MR J4 A

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