In the previous post, pl247.com showed you how to use the Allen-Bradley MicroLogix 1400 PLC to control a number of Temperature Controllers and Inverters of different brands.
Today plc247.com will continue to guide you to use MicroLogix 1400 PLC to control a type of inverter originating from Japan “Hitachi NE S1 Inverter” through Modbus communication standard (Hitachi NES1 built-in 1 RS485 Port.)
MicroLogix 1400 & Hitachi NES1 “Wiring Diagram”
- Connect directly to the RS485 (RJ45) port of the MicroLogix 1400 PLC or use the 1763-NC01 Module for easy wiring.
Hitachi NE S1 Modbus Parameters Setting
+ In addition to the basic parameters of the inverter installed according to the Motor (Frequency, Current, Voltage…) then we need to install the following communication parameters:
+ We also need to switch the SW5 to “RS485” Mode
Hitachi NE-S1 Registers Address Table
Below is the address table of Coils and Registers used in “Modbus RTU” Control.
Note: MicroLogix 1400 Address = “VFD Address (Dec) + 1“
+ VFD Run / Stop “Coil Address” = 0 + 1 = 1 (dec)
+ VFD Direction Roatation “Coil Address” = 0 + 1 = 2 (dec)
+ VFD Trip Reset “Coil Address” = 0 + 3 = 4 (dec)
+ VFD Set Frequency “Word Address” = 1 + 1 = 2 (dec)
+ VFD Output Frequency “Word Address” = 1 + 4097 = 4098 (dec)
VFD Output Current “Word Address” = 1 + 4098 = 4099 (dec)
VFD Output Voltage “Word Address” = 1 + 4112 = 4113 (dec)
PLC “MicroLogix 1400” Modbus-RTU Configuration
In order for the MicroLogix 1400 PLC to control Hitachi NE S1 via Modbus-RTU, we need to set the communication parameters of the PLC to be the same as the VFD.
+ Read / Write Distribution
+ Frequency Setting Command
+ Run / Stop Control
+ Forward / Reverse Control
+ VFD Reset Control
+ Read Data Monitoring
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