Hello, Siemens PLC S7-1200 and Danfoss-FC302 inverter are two devices commonly used in many machines around the world, especially standalone machines.
Today plc247.com will guide you to use PLC S7-1200 to connect and control Danfoss FC302 via Modbus RTU (RS485).
Siemens S7-1200 & Danfoss FC51 “Wiring Diagram”
With S7-1200 we need to use more RS485 Module: S7-1200 CB1241 (or S7-1200 CM1241), and with Danfoss FC51 inverter, it has a built-in RS485 Port.
Danfoss FC51 Modbus RTU Configuration
To be able to control Danfoss FC51 with Modbus RTU, we need to configure the following parameters
Danfoss FC51 Registers for Control
Note: S7-1200 Modbus Address
= “VFD Address (dec) + 400001”
>>> VFD Control Address = 49999 + 400001 = 450000
- Set Register 450000 = 1148 (dec) >>> Run Forward
= 33916 (dec) >>> Run Reverse - Set Register 450000 = 1084 (dec) >>> Stop
- Set Register 450000 = 1212 (dec) >>> VFD Reset
>>> VFD Frequency Setting Address = 50009 + 400001 = 450010
- Speed Reference = 0 to 16384(dec) ~ (0 to 100%)
Danfoss FC51 Registers for Monitoring
- Output Voltage Address = 416120 (dec)
- Output Frequency Address = 416130 (dec)
- Output Current Address = 416140 (dec)
Siemens S7-1200 Modbus RTU Setting
We need to set the communication parameters of S7-1200 the same as Danfoss FC51
+ S7-1200 RS485 Parameters Setting
+ Data Block Create
S7-1200 Modbus RTU Example
+ Read and Write Distribution
+ VFD Frequency Setting
+ VFD Control Command
+ Read Ouput Voltage
+ Read Output Frequency
+ Read Output Current
Project Video Tutorial
======
Related Software and Documents
+ Download Siemens S7-1200 Programming Software
+ Danfoss FC51 Manual PDF Download
Password Extract: plc247.com
If in the process of connecting S7-1200 with Danfoss FC51 you have any questions, please comment below the article, plc247.com will answer you as soon as I read the comments.
Best Regards!
How setting was change if I use 19 Inveter
only change slave address
How do you know register adresses?
need read danfoss fc51 manual pdf