Modbus TCP Server

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This topic contains 5 replies, has 2 voices, and was last updated by Mikhail Mikhail 2 months, 3 weeks ago.

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  • #5571
    Avatar
    burscheservas
    Participant

    Hi all,

    I try to connect rapidscada directly to a PLC using Modbus TCP. The PLC has the libmodbus library implmented to establish the modbus connection.
    The PLC can communicate with test software and also with the Modbus simulator (plcsimulator.org).

    On the rapidscada side, I have been able to manage the connection from rapidscada to the Modbus Simulator as well. It works in principle.

    If I add a new communication line with new object to the rapidscada configuration and set the communication to Modbus TCP Server (TcpPort = 502, behavior = slave, connmode = shared, devselmode = byipaddress) the connection can not be established.
    I tried all possible combinations, but the tcpport 502 is not opening.
    It seems that the TCP Server is not running correctly.

    Do you have any idea/advice how to go forward to check the issue?

    Thanks in advance.

    Regards,
    John

    #5574
    Mikhail
    Mikhail
    Moderator

    Hi,

    Rapid SCADA works as TCP client, not TCP server. It connects to a PLC which is TCP server and PLC keeps port 502 open.

    #5580
    Avatar
    burscheservas
    Participant

    Hi Mikhail,

    Thanks for the quick response!
    This is unfortunately not good to hear for me.

    Do you know maybe any stand alone Modbus TCP server software (open source / freeware) that can be used as software modbus TCP coupler?

    Thanks

    regards,
    John

    #5587
    Mikhail
    Mikhail
    Moderator

    Hi John,

    I researched for this, and I have’t found any free solution. We can develop such driver as a custom development by a contract.

    #5595
    Avatar
    burscheservas
    Participant

    Hi Mikhail,

    Thanks for your reply and your offer.

    Currently, I am investigating my options. Should I come to the requirement to use a customized solution I will come back to you.

    Regards,
    John

    #5599
    Mikhail
    Mikhail
    Moderator

    Hi John,

    Sure. Any time. We provide high quality and competitive price 🙂

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