Mitsubishi QJ71C24N “Modbus RTU” LS iG5A Tutorial

LS iG5A inverter is suitable for low-power light-load motors from 0.4 – 22kW. Therefore, this is a very popular inverter line on the market today because of its good quality and stable operation. Because of the convenience and ease of installation, it brings high reliability and safety to users. In particular, the price is quite reasonable, lower than many other inverter lines on the market today.

Today plc247.com will guide you to use the Q-Series PLC in combination with the QJ71C24N Module to control the LS iG5A inverter through the Modbus-RTU communication protocol.

Mitsubishi QJ71C24N & LS iG5A “Wiring Diagram”

+ Wiring diagram for communication between Module QJ71C24N and inverter LS iG5A

LS iG5A Inverter “Modbus RTU” Configuration

Below are the Modbus-RTU communication parameters that we need to install for the LS IG5A inverter so that it can be controlled by PLC

In this Project plc247.com install as follows:

• Drv: 3
• Frq: 7
• I59: 0 (Choose Modbus-RTU)
• I60: 1 (Slave = 1)
• I61: 3 (baudrate = 9600bps)
• I62: 0
• I65: 2 (Even/Stop bit =1)

LS iG5A Registers Address Mapping

>>> Frequency Setting Address = 5 – 1 = 4 (hexa)

>>> VFD Control Word Address = 6 – 1 = 5 (hexa)

• Set Word 5 (hex) = 2 >>> Run Forward
• Set Word 5 (hex) = 4 >>> Run Reverse
• Set Word 5 (hex) = 0 >>> Stop

>>> Output Current Adress = 9 – 1 = 8 (hex)

>>> Output Frequency Address = A – 1 = 9 (hex)

>>> Output Voltage Address = B – 1 = A (hex)

QJ71C24N “Modbus RTU” Parameters Setting

Here are the steps to install the communication parameters for the Mitsubishi QJ71C24N Module, please pay attention not to skip any steps.

+ Step 1: Create Project

+ Step 2: Module Configuration

+ Step 3: CH2. Modbus-RTU Parameters Setting

+ Step 4: Sent Parameters to Module QJ71C24N

+ Step 5: Disable Echoback Command

• Set G450 = 1 (Disable Echoback)

QJ71C24N & LS iG5A VFD “Registers Address Config.”

+ Go to “Serial Communication Module…” Setting

+ Add/Read/Write Protocols

Modbus Registers Address Table

+ Protocol No.1: Func = 06 / Write Single Registers

• Slave Address = D100
• Register Adress = D101
• Register Value = D110
• “Comm. Error” = D300

+ Protocol No.2: Func = 03 / Read Holding Registers

• Slave Address = D200
• Starting Address = D201
• Quantity of Registers = D202
• Registers Value Response = D210 “From D210…D335 depending on the number of Registers (D202) to read”
• “Comm. Error” = D300

Important: Need to set “Receive Wait Time”, if Set = 0, error communication will be Infinite Wait

QJ71C24N “Modbus RTU” Example

+ System Ready & Error Clear

+ Read/Write Distribution

+ Frequency Setting Command

+ VFD Control Command

+ Data Monitoring

+ HMI Control Address

Detailed Instruction Video

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Related Software and Documents

+ Download GX Works.2 Mitsubishi PLC Software

+ Weintek HMI & PLC Q-Series “Ethernet Connection”

+ Download LS iG5A Inverter Manual PDF

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