Establishing a Modbus TCP connection with PLC

[Greg Madden]

I am trying to use modes-tk just to make a connection from my PC to a PLC over Modbus TCP. The PLC's IP is 10.0.0.168 and listens on port 502. I was able to communicate with the PLC using pymodbus so I can confirm that there are no network errors and that the PLC does accept connections. I am now trying to do the same thing with modbus-tk.

I have tried running the examples on my computer in two different shells but there are errors between both the master and slave so I cannot learn much from them.

What is the most basic way to establish a connection from my PC to the PLC?

[Luc JEAN]

Hello,

The TcpMaster class has 3 parameters on his constructor : host="127.0.0.1", port=502, timeout_in_sec=5.0

By default it tries to connect on localhost but you can change it by changing the value of the host parameter. Something like should work

master = modbus_tcp.TcpMaster(host=’10.0.0.168')

I hope it helps

Best

luc

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[Samrat Hossain]

hai,

I am new

I would connect with PC to a PLC over Modbus TCP. Plz help me how may i do this communication with the PLC.