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MicroLogix 1400 “Modbus RTU” Hitachi NE S1 Tutorial

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Hello friends!
In the previous post, showed you how to use the Allen-Bradley MicroLogix 1400 PLC to control a number of Temperature Controllers and Inverters of different brands.

Today 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.

PLC Programming

+ Read / Write Distribution

+ Frequency Setting Command

+ Run / Stop Control

+ Forward / Reverse Control

+ VFD Reset Control

+ Read Data Monitoring

Project Video Tutorial


>>> PLC MicroLogix 1400 Manual PDF Download
>>> Hitachi NE S1 Inverter Manual PDF Download

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If you need any support in the process of using MicroLogix 1400 PLC to control Hitachi NES1 VFD via Modbus RTU, please comment below the article, will reply to you as soon as I read the comment.

Best Regards!

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