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PLC Keyence “Modbus RTU” LS iG5A VFD Tutorial

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Continuing with the series of articles on how to control LS iG5A VFD via Modbus-RTU (RS485) communication standard, today would like to continue to guide you to use PLC Keyence to control

We can use any Keyence PLC of KV-Series in combination with Module KV-L21/21V to connect.

Keyence KV-L21V & LS iG5A VFD Connection Diagram

LS iG5A Configurator

In addition to the basic parameters for the motor installation, we need to set the communication parameters according to the following table

+ Drv = 3

+ Frq = 7

+ I59 = 0

+ I60 = 1

+ I61 = 3

+ I62 = 0

+ I65 = 2

Modbus Regigter Address

Note: PLC Register Address = “Address – 1”

PLC Keyence Modbus RTU Configurator

We need to set the same parameter as the inverter

KV5500 PLC Programming

+ Reset registers when PLC starts running & Control Read/Write

+ Frequency Write Command

+ Control Run Command

+ Read Data Command

+ Read Data Reponse

Video Installing and Running the Program


Required documents and software:

+ KV Studio for PLC Keyence Programming

+ LS iG5A VFD Manual PDF Download (Password Extract:

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Best Regards!

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