Hello friends!
In previous posts, plc247.com showed you how to use the MicroLogix 1400 PLC to control many different devices by controlling the PLC in Modbus-RTU Master Mode.
Today plc247.com will continue to guide you to use MicroLogix 1400 PLC to control FUJI Frenic Inverter through Modbus-RTU (RS485) Communication.
MicroLogix 1400 & FUJI Frenic “Wiring Diagram”
+ You can connect the wire directly to the Mini DIN port – 8Pin is the RS485 port of the PLC:
- Pin 4: “B” (RS485+)
- Pin 5: “A” (RS485-)
+ We can also buy Module 1763-NC01 for easy wiring
FUJI Frenics “Modbus-RTU” Parameters Setting
In addition to the basic parameters of the inverter installed according to the motor (frequency, current, voltage …) then we need to install additional communication parameters as below to be able to control by Modbus-RTU
+ 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 Group Address
Here is the table of Hexa Address Groups
Fuji Frenic Registers Address for Control
Note: MicroLogix 1400 Address = “VFD Address (Dec) + 1“
+ Frequency Reference = S (07H) + 05 = 705 (hex)
>>> PLC Address = 705 (hex) + 1 = 1797 (dec) + 1 = 1798
+ VFD Control Address = 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
FUJI Frenic Registers Address for Monitoring
In this project, plc247.com will use 1 Instruction to read 4 Data Output registers of FUJI Frenic, from address “M9 to M12”
+ Output Frequency = M (08H) + 09 = 809 (hex)
>>> PLC Address = 809 (hex) + 1 = 2057(dec) +1 = 2058
MicroLogix 1400 “Modbus RTU” Configuration
How have we set up the communication parameters in the FUJI Frenic Inverter, the same settings in the MicroLogix 1400 PLC will allow the PLC to connect to the inverter.
PLC Programming
+ Write/Read Command Distribution
+ VFD Forward / Reverse / Stop Control
+ Frequency Setting Write
+ Data Monitoring Read
Project Video Tutorial
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References
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