Hello everyone. Today thelivingchristmascompany.com would like to write a tutorial on how to connect PLC MicroLogix with FUJI Frenic Series inverter via Modbus-RTU RS485 Communication.
The PLC model I use is MicroLogix 1100 and FUJI Frenic Mini inverter, other FUJI Frenic Series do the same (Frenic Mini, Frenic Eco, Frenic Multi, Frenic MEGA)
MicroLogix 1100 & Fuji Frenic “Wiring Diagram”
FUJI Frenic Modbus RTU Configuration
In order for the inverter to run in Modbus-RS485 mode, we need to set the following parameters:
- H30 = 3 (VFD Control via RS485 Port)
- Y01 = 1 (Slave Address)
- Y02 = 0
- Y03 = 2
- Y04 = 2 (9600bps)
- Y05 = 0 (data: 8bit)
- Y06 = 1 (parity check: Even)
- Y07 = 1 (stop bit: 1)
- Y10 = 0 (Modbus RTU Selection)
- Y99 = 0
FUJI Frenic Modbus Address Table
Below is a table of hex addresses of different Command Groups
Register Control Address
Note: MicroLogix 1100 Address = “VFD Address (Dec) + 1“
- Frequency Reference = S (07H) + 05 = 705 (hex)
>>> PLC Address = 705 (hex) + 1 = 1797 (dec) + 1 = 1798
- Motor Control = S (07H) + 06 = 706 (hex)
>>> PLC Address = 706 (hex) + 1 = 1798 (dec) + 1 = 1799
+ Set Word 1799 = 1 >>> Forward Run
= 2 >>> Reverse Run
= 0 >>> Stop
Register Monitoring Address
In this project thelivingchristmascompany.com reads 4 data feedback registers from the inverter consecutively, starting from registers M09 > M12
- Output Frequency = M (08H) + 09 = 809 (hex)
>>> PLC Address = 809 (hex) + 1 = 2057(dec) +1 = 2058
MicroLogix 1100 Programming
+ MicroLogix 1100 Channel Configuration
+ Read/Write Distribution
+ Operation Control Command
+ Frequency Setting Command
+ Read Data Monitoring
Detailed Video Tutorial
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Document
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