Inovance MD200 inverter is a cheap inverter commonly used in small machines, especially machines originating from China, today plc247.com will guide you to control and monitor it adopts “Modbus RTU” protocol
I use the Allen-Bradley MicroLogix 1100 PLC (built-in 1 RS485 port) to connect and control the Inovance MD200 inverter
MicroLogix 1100 & Inovance MD200 “Wiring Diagram”
You can use the 1763-NC01 expansion module for easy wiring or connect directly to the RS485 port of the MicroLogix 1100 PLC.
Inovance MD200 Modbus Parameters Setting
Below are the communication parameters that need to be set up for the Inovance MD200 so that we can control it with Modbus-RTU.
Inovance MD200 Modbus Registers
Note: PLC MicroLogix Holding Registers Address =
“VFD Address (Dec) + 1“
+ VFD Control Address = 2000 (hex) = 8192 (dec) + 1 = 8193 (dec)
- Set Word 8193 = 1 >>> Forward Run
- Set Word 8193 = 2 >>> Reverse Run
- Set Word 8193 = 6 >>> Stop
>>> Set Frequency Address = 1000 (hex) = 4096 (dec) + 1 = 4097 (dec)
+ Frequency Reference = (0 to 10000 dec) ~ (0 to VFD Max Frequency)
- Output Frequency Address = 1001 (hex) = 4097 (dec) + 1 = 4098 (dec)
- Output Voltage Address = 1003 (hex) = 4099 (dec) + 1 = 4100 (dec)
- Output Current Address = 1004 (hex) = 4100 (dec) + 1 = 4101 (dec)
PLC Micrologix Modbus RTU Configuration
+ Communication Distribution
+ VFD Control Command
+ Frequency Setting Command
+ Data Monitoring
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