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Keyence KV5500 “Modbus RTU” INVT Goodrive 20 VFD

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Hello everyone!
In the previous article, guided people to use Weintek’s MT8071iE HMI to control the INVT GD20 inverter via Modbus RTU, today I will continue to guide you to use PLC Keyence to control it.

To be able to use Modbus RTU (RS485) I use PLC KV5500 in combination with Module KV-L21V to communicate with INVT inverter.

Keyence KV-L21V & INVT GD20 “Wiring Diagram”

If communication distance >50m or communication with multiple slave devices, need to use end resistor 120Ω

INVT GD20 Modbus Configurator

In order for the inverter to communicate with Modbus-RTU, we need to set the following communication parameters:

+ P00.01: 2 (Motor Control via RS485)

+ P00.06: 8 (Frequency Setting via RS485)

+ P00.09: 0 (A Frequency Selection)

+ P14.00: 1 (Slave Address)

+ P14.01: 3 (Baudrate-9600bps)

+ P14.02: 1 (8/1/E RTU)

+ P14.03: 5

+ P14.04: 0

Keyence KV5500 Programming

KV-L21V Modbus Configurator: Need Setting same VFD

+ Reset Data & Distribution Read/Write

+ Frequency Write Command

+ Motor Control Command

+ Read Data Response Command

Separate Data Output

Video Tutorial


Related Documents and Software:
+ KV-Studio for PLC KV5500 Programming
+ INVT Goodrive 20 Manual PDF (Password:

If you have any difficulties in connecting PLC Keyence to INVT GD20 via Modbus-RTU, please comment below the article. Please share this post if you find it useful.

Best Regards!

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