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Siemens S7 1200 “Modbus RTU” Danfoss FC302 Tutorial

PLC Siemens S7-1200 and Danfoss FC302 VFD are two devices originating from Europe with extremely high quality and durability, this is a duo used a lot around the world.

Today plc247.com will guide you to use S7-1200 in combination with RS485 module S7 1200 CB1241 (or S7 1200 CM1241) to control Danfoss FC302 inverter through Modbus RTU (RS485) Communication standard

S7 1200 & Danfoss FC302 “Wiring Diagram”

Danfoss FC302 Modbus RTU Setting

To be able to control Danfoss FC302 VFD with Modbus RTU, we need to configure the following parameters (the following table is the parameters that plc247.com recommends)

Danfoss FC302 Registers Address for VFD Control

Note: S7-1200 Modbus Address
= “VFD Address (dec) + 400001”

  • VFD Control Address = 49999 + 400001 = 450000

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

  • Setting Speed Address = 50009 + 400001 = 450010
    Speed Reference = 0 to 16384(dec) ~ (0 to 100%)
Danfoss FC302 Registers Address for Monitoring
  • Voltage Output Address = 416120
  • Frequency Output Address = 416130
  • Current Output Address = 416140
  • Speed Output Address = 416170

Siemens S7-1200 Modbus Configuration

+ S7 1200 CB1241 Parameters Settings

+ Create Data Block

S7-1200 PLC Programming

+ Read / Write Distribution

+ Communication Configuration

+ Speed Setting Command

+ VFD Control Command

+ Read Voltage Output

+ Read Frequency Output

+ Read Current Output

+ Read Speed Output

Project Video Tutorial

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Required software and documentation

+ Download TIA Portal V15.1 for S7-1200 Programming

+ Danfoss FC302 Manual PDF Download (Password Extract: plc247.com)

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