Hello everyone, today plc247.com will continue the series of articles using Siemens S7-1200 PLC connected to different inverters.
The inverter I choose to control today is a Delta VFD-M inverter, this is probably an extremely popular inverter from Taiwanese electronics.
Wiring Diagram Simenes S7-1200 & DELTA VFD-M
Delta VFD-M inverter with built-in RS485 port is RJ-11 port (Deskphone port)
Delta VFD-M Communication Configuration
To be able to control Delta inverters via Modbus-RTU RS485 communication standard, we need to configure as follows:
Write Register Address
2000 (Hex) = 8192 (Dec)
>>> Address for Control Motor = 40001 + 8192 = 48193 (Dec)
+ Run Forward > Set 48193 = 0000 0000 0001 0010 (Bin) = 12 (Hexa) = 18 (Dec)
+ Run Reserved > Set 48193 = 0000 0000 0010 0010 (Bin) = 22 (Hexa) = 34 (Dec)
+ Stop > Set 48193 = 0000.0000.0000.0001 = 1 (Dec)
——
2001 (Hex) = 8193 (Dec)
>>> Address for Frequency Setting = 40001 + 8193 = 48194 (dec)
Read Register Address
plc247.com read 4 output registers including: Output Frequency, Output Current, DC-BUS Voltage, Output Voltage.
>>> The starting address will be : 40001 + 8451 (2103H) = 48452 (Dec)
S7-1200 Communication Configuration
Configuration Module S7-1200 CB1241
Create Data Blocks
Siemens S7-1200 PLC Programming
+ Create counters for Communication distribution
+ Communication Load Block
+ Write Frequency Command
+ Motor Control Run
+ Output Data Read
Detailed Installation Instruction Video
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Documentation and supporting software:
- DELTA VFD-M Manual PDF download (Password: plc247.com)
- STEP7 & WinCC Professional V15.1 Download
Thanks and Best Regards!
