Hello everyone. Today plc247.com would like to continue to write a tutorial for you to use the Allen Bradley Micrologix 1100 PLC to control the iG5A Series inverter of LS through “Modbus RTU RS485” communication.
Micrologix PLC has a built-in RS232/RS485 port, you can use Cable 1763-NC01 or you can use an electrical cord, pins plugged directly into the PLC port is fine.ư
Micrologix 1100 & LS iG5A VFD “Wiring Diagram”
LS iG5A VFD Modbus RTU Settings
We need to set the following parameters to be able to control the LS iG5A Inverter by Modbus RTU
Project Parameters Setting
- Drv = 3 (Motor Control via Communication Port)
- Frq = 7 (Frequency Reference via Communication Port)
- I59 = 0 (Modbus RTU Selection)
- I60 = 1 ( Slave Number = 1)
- I61 = 3 (9600bps)
- I62 = 0
- I65 = 2 (Even/Stop bit=1)
LS iG5A Mobdus Registers Address
+ Frequency Reference Address = 5
+ Motor Control Address = 6
- Set Word 6 = 2 > Forward Run
- Set Word 6 = 4 > Reverse Run
- Set Word 6 = 0 > Stop Run
+ Read “3 Data Output registers” consecutively starting from Output Current = 9
PLC Programming
+ MicroLogix 1100 Channel Configuration
+ 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
+ LS iG5A Manual PDF Download
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If you need any help in connecting the MicroLogix 1100 PLC to the LS iG5A VFD, please comment below the article. Please share the article if you find it useful.
Thanks and Best Regards!