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[Tutorial] Omron CP1H & FR-E720 Mitsubishi VFD Modbus-RTU

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PLC OMRON CP1H and Mitsubishi inverter FR-E700 Series are both common automation devices in factory factories.

With the problem of remote inverter control or controlling multiple inverters with 1 PLC, we can use Modbus-RTU RS485 (supports up to 32 stations and distances up to 1200m)
Today I will guide you to use PLC CP1H (CP1L, CP1E) to control Mitsubishi FR-E720 inverter by CP1W-CIF11 Module

Connection diagram PLC OMRON CP1H & VFD Mitsubishi FR-E720

VFD settings FR-E720

Below are the required parameters of the Mitsubishi FR-E720 Inverter

For this project, please install according to the parameters below

  • Pr117 : “1” (Slave.1)
  • Pr118 : “9600” (Baud rate)
  • Pr119 : “0” (8bit/Stop bit.1)
  • Pr120 : “2” (Even bit)
  • Pr121 : “9999”
  • Pr122 : “9999”
  • Pr123 : “9999”
  • Pr124 : “1”
  • Pr340 : “1”
  • Pr549 : “1”
  • Pr79 : “6” ( External Mode > Last setting )


Address where holding register data write will be started Starting address = Starting register address (decimal)-40001
For example, setting of the starting address 0001 reads the data of the holding register 40002

Modbus Registers Address

Real Time Monitor

PLC Configuration Omron CP1H

PLC Programming

Transmission Distribution

Control Run

Frequency Write

Forward/Reverse/Stop Write

Read Data Selection

Read Frequency/Current/Voltage Data Command

Read Frequency/Current/Voltage Output

Video Tutorial for Connecting CP1H & FR-E720 via Modbus-RTU


If you have any difficulties in connecting CP1H & FR-E720 via Modbus-RTU RS485 standard, please comment below the article, will reply you as soon as I read it.

Thanks and Best Regards!

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