Zahi Younis

FX3U Modbus help

3 posts in this topic

Hello,  

I am trying to read and write coils with FX3U plc, does anybody know any modbus software that helps me communicate with this plc?

 I tried simplemodbus and modbuspoll with no success.

 I am using serial port.

thank you

Edited by Zahi Younis

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Hello Zahi Younis,

You need to give some more information about this case. Where do you get the information from the Modbus protocol? Otherwise, Mitsubishi have their own communication protocol.

 

 

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Serial port ?, not the programming port I hope.

Are you using a FX3U-485BD or FX3U-232BD card ?

Or perhaps the FX3U-485ADP-MB module ?

The programming port can not be used for Modbus  communication.

You also need a 485-232 converter if the PLC use a RS485 Modbus RTU communication and shall be connected to the PC.

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