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FX3U “Modbus RTU” Siemens Sinamics V20 Tutorial

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Hello friends.
The FX3U PLC is one of the most popular and used PLCs in the world. It is one of Mitsubishi’s most famous PLCs with outstanding advantages and competitive price.

Today will guide you to use the FX3U PLC in combination with the FX3U-485ADP-MB Module to control the Siemens Sinamics V20 inverter via Modbus RTU (RS485)

FX3U & Sinamics V20 “Wiring Diagram”

Siemens Sinamics V20 Modbus RTU Setting

In addition to the basic parameters installed according to the motor, we must configure the following communication parameters so that the inverter can be controlled by Modbus RTU

Registers Control

>>> VFD Control Address = 99

+ Set Word 40100 = 1151 >>> Forward Run
= 3199 >>> Reverse Run
= 1150 >>> Stop

+ Set Word 40100 = 1278 >>> VFD Reset

>>> VFD Frequency Reference Address = 100

Registers Monitoring

>>> Frequency Output Address = 23

>>> Speed Output Address = 24

>>> Current Output Address = 25

Mitsubishi FX3U Programming

+ Channel 2 Communication Setting

+ Read/Write Automatic Distribution

+ Frequency Setting Command

+ VFD Control Command

+ Data Monitoring

Detailed Instruction Video


Related Software and Documents

+ GX-Works2 for PLC Mitsubishi Programming
+ Download Siemens Sinamics V20 Manual PDF

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