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Siemens S7-200 “Modbus RTU” Danfoss FC302 Inverter

Written by plc247.com

Hello friends!
Hello everyone, continuing to use Siemens S7-200 PLC to control different types of Controllers and inverters through Modbus-RTU communication protocol, today plc247.com continues to guide you to control inverters Danfoss FC302.

Both Siemens S7-200 and Danfoss FC302 devices have built-in RS485 communication to support Modbus RTU communication. I will guide you to control Danfoss FC302 simply and easily.

Siemens S7-200 & Danfoss FC302 “Wiring Diagram”

To be able to control the Danfoss FC302 inverter through the Modbus-RTU communication protocol, we need to set the following communication parameters for the inverter:

Danfoss FC302 Registers Address Mapping
Note: Siemens S7-200 Holding Registers Address =
“VFD Address (Dec) + 400001”

>>> VFD Control Address = 400001 + 49999 = 450000 (dec)

  • Set Word “450000” = 1148 (dec) >>> Run Forward
  • Set Word “450000” = 33916 (dec) >>> Run Reverse
  • Set Word “450000” = 1084 (dec) >>> Stop
  • Set Word “450000” = 1212 (dec) >>> VFD Reset

>>> Set Frequency Address = 400001+ 50009 = 450010 (dec)

  • Speed Reference Setting = 0 to 16384 (dec) = (0 to 100%)

+ Voltage Output Address = 400001 + 16119 = 416120 (dec)

+ Frequency Output Address = 400001 + 16129 = 416130 (dec)

+ Current Output Address = 400001 + 16139 = 416140 (dec)

+ Speed Output Address = 400001 + 16169 = 416170 (dec)

PLC Programming

+ Read/Write Distribution

+ Modbus Configuration

+ Frequency Setting Command

+ VFD Control Command

+ Voltage Output Monitoring

+ Frequency Output Monitoring

+ Current Output Monitoring

+ Speed Output Monitoring

Project Video Tutorial

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Related Software and Documents
+ Download Siemens S7-200 Programming Software
+ Download Danfoss FC302 Manual PDF

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