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PLC Inovance “Modbus RTU” LS iG5A Tutorial

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Hello everyone, in the previous post, showed you how to use PLC Inovance to control Mitsubishi FR-E700 Series inverters using Modbus RTU (RS485) communication method.

Today I will continue to write a tutorial for you to use the Inovance H3U-3232MT PLC to control another type of inverter, the LS iG5A inverter originating from Korea.

Inovance H3U & LS iG5A “Wiring Diagram”

+ Both PLC Inovance H3U-3232MT and LS iG5A VFD have built-in RS485 port for controllable by Modbus RTU communication.

LS iG5A “Modbus RTU” Parameters Setting

In addition to the basic parameters of the inverter installed according to the motor (Frequency, voltage, current …) then we need to install additional communication parameters so that the LS iG5A inverter can be controlled by Modbus RTU.

I recommend you to set the following settings for stable communication between LS iG5A and PLC

  • Drv = 3 (Motor Control via Communication Port)
  • Frq = 7 (Frequency Reference via Communication Port)
  • I59 = 0 (Modbus RTU Selection)
  • I60 = 1 ( Slave Number = 1)
  • I61 = 3 (9600bps)
  • I62 = 0
  • I65 = 2 (Even/Stop bit=1)
LS iG5A Modbus-RTU Registers Address

>>> Frequency Setting Address = 5

>>> VFD Control Address = 6

  • Set Word “6” = 2 > Forward Run
    = 4 > Reverse Run
    = 0 > Stop

+ Output Current Address = 9 (hexa)
+ Output Frequency Address = A (hexa)
+ Output Voltage Address = B (hexa)

PLC Inovance Modbus Configuration

We need to set the communication parameters for the PLC Inovance exactly the same as those installed for the LS iG5A inverter.

PLC Inovance “Modbus RTU” Example

+ Add Modbus Config

+ Setting & Program

Project Video Tutorial



+ AutoShop V3.02 PLC Inovance Software Download
+ LS iG5A Inverter Manual PDF Download

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