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MicroLogix 1400 “Modbus RTU” LS iG5A Tutorial

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Hello everyone, in the previous post guided you to use MicroLogix 1400 to control Mitsubishi FR-E720 through “Modbus RTU”. Today I will continue to guide you to control another type of Inverter “LS iG5A VFD”

LS iG5A inverter has built-in RS485 port, so we can use MicroLogix to connect it directly to control it through Modbus RTU.

MicroLogix 1400 & LS iG5A VFD “Connection Diagram”

+ The PLC model used is MicroLogix 1400 “1766-L32BXB”
+ MicroLogix 1400 RS485 port is Mini DIN-8 Pin, we can connect it directly or use Module 1763-NC01 for easy wiring

LS iG5A “Modbus RTU” Parameters Setting

In addition to the basic parameters of the inverter, we need to install the following communication parameters so that the inverter can be controlled by “Modbus RTU”

To stabilize, recommends the following settings:

+ 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 Registers Address Table

>>> Frequency Reference Address = 5

>>> VFD Control Address = 6

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

>>> In this project will use 1 instruction to read 3 Registers (Output Current, Output Frequency, Output Volatge) starting from Address = 9

MicroLogix-1400 Modbus Example

+ Channel Configuration (Using Channel 0)

+ Read / Write Auto Distribution

+ VFD Control Command

+ Frequency Setting Command

+ Read Data Monitoring

Video Tutorial



+ MicroLogix 1400 Manual PDF Download

+ LS iG5A Manual PDF Download

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