Hello, today plc247.com continues to guide you to connect Allen Bradley MicroLogix Series PLC to INVT GD20 VFD using “Modbus RTU” Communication Standard.
The PLC model I use is MicroLogix 1100 combined with Cable RS232/RS485 1763-NC01 (if you don’t have one, you can plug it directly into the port of the PLC)
MicroLogix 1100 & INVT GD20 “Wiring Diagram”
INVT Goodrive20 Modbus RTU Settings
In addition to the basic parameters of the inverter installed according to the motor (frequency, current, voltage), we need to set the communication parameters as follows:
- P00.01 = 2 (Frequency Reference via RS485)
- P00.06 = 8 (Motor Control via RS485)
- P00.09 = 0 (A Frequency Selection)
- P14.00 = 1 (Slave Address: 1)
- P14.01 = 3 (9600bps)
- P14.02 = 1 (Modbus RTU 8/E/1)
- P14.03 = 5
- P14.04 = 0.0
Register for Control
Note: MicroLogix 1100 Address = “VFD Address (Dec) + 1“
+ Motor Control Address = 2000 (hex) + 1
= 8192 (dec) + 1 = 8193
- Set Word 8193 = 1 >>> Forward Run
= 2 >>> Reverse Run
= 5 >>> Stop
+ Frequency Reference Address = 2001 (hex) + 1
= 8193 + 1 = 8194
Register for Monitoring
- Output Frequency Address = 3000 (hex) + 1 = 12288 (dec) + 1 = 12289
- Setting Frequency Address = 12290
- DC-BUS Voltage Address = 12291
- Output Volatge Address = 12292
- Output Current Address = 12293
PLC Programming
+ Channel Configuration
+ Generate 0.01s Pulse and Read/Write Distribution
+ Motor Control Command
+ Frequency Reference Command
+ Data Monitoring Command
Video Tutorial
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Required Documentation
+ MicroLogix 1100 Manual PDF Download
+ INVT Goodrive20 VFD Manual PDF Download
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