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Mitsubishi FX5U “Modbus RTU” Siemens Sinamics V20

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Hello Friends!
In the previous post, wrote a tutorial on how to use PLC FX5U to connect and control temperature controllers of Omron E5CC and Autonics TK4S.

Today will guide you to use Mitsubishi FX5U PLC to control Siemens Sinamics V20 inverter (both have built-in RS485 communication port)

PLC FX5U & Sinamics V20 ” Connection Diagram”

Note: Use a 120Ω terminal resistor if the communication distance is far

Siemens Sinamics V20 Modbus-RTU Setting

To be able to control Siemens Sinamics V20 with Modbus RTU, we need to install at least the following communication parameters:

Siemens V20 Registers Address

>>> VFD Control Address = 99 (dec)

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

+ Set Word 40100 = 1278 >>> VFD Reset

>>> VFD Frequency Reference Address = 100 (dec)
+ Speed Reference = 0 to 16384(dec) ~ (0 to 100%)

  • Frequency Output Address = 23 (dec)
  • Speed Output Address = 24
  • Current Output Address = 25

Mitsubishi FX5U Modbus-RTU Configuration

It is necessary to configure the same communication parameters as those set in Siemens Sinamics V20

Mitsubishi FX5U Programming

+ Reset & Read/Write Distribution

+ Setting Frequency & Control Command

+ Read Data Response

Project Video Tutorial


Related Software and Documents

+ Download Mitsubishi FX5U Programming Software

+ Siemens Sinamics V20 Manual PDF Download (Password Extract:

If you need any assistance in connecting the FX5U PLC with Siemens Sinamics V20, please comment below the article, will reply to you as soon as I read the comment.

Best Regards!

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