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    Modbus over TCP/IP and internet via Ethernet

    Hi, i need a guidance on enabling a device to communicate using modbus over tcp/ip to get data and send it over the internet. To achieve this, I think i will need one Ethernet connector(RJ45) for the SCADA connection for modbus over tcp/ip and another RJ45 for Ethernet connection to the internet. Could anyone give me keywords to search in accomplishing the task or explanation on how to go about this. I am new to networking and any help is appreciated, thank you.

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    Re: Modbus over TCP/IP and internet via Ethernet

    Is your device a MODBUS server or client? In both cases, you just plug the interface cable to an internet connected network infrastucture. But in case of a server you need to configure the network to forward incomming MODBUS TCP packets to the local IP address used by the MOSBUS server. Your network must also have a public IP address or utilize a DDNS server. Or provide a VPN tunnel to the remote client.



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  3. #3
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    Re: Modbus over TCP/IP and internet via Ethernet

    I am actually making a MODBUS client device that will connect/communicate with the MODBUS server.
    My device will query for data from the MODBUS server using the MODBUS over tcp/ip via one of it's RJ45.
    And my device will need to send that data to the internet via the other one of it's RJ45 connected to a modem etc.
    So my device will have 2 RJ45 ports and I am not sure how to handle the implementations(if there is a specific name for these kind of connection).
    I would like to know what to search to start or guidance such as connection model? name, is it possible to implement, how do I go about tackling the problem, etc.



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    Re: Modbus over TCP/IP and internet via Ethernet

    It's not generally necessary to have two network interfaces. More commonly the local network provides a gateway to the internet, so both communications can go through the same network port.



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    Re: Modbus over TCP/IP and internet via Ethernet

    Click image for larger version. 

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    I think you are talking about the (B) connection?
    I think the (B) connection would be costly and I need more like the (A) connection.
    Is (A) connection possible and how would I go about implementing this.



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  6. #6
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    Re: Modbus over TCP/IP and internet via Ethernet

    Neither of it. I'm assuming a typical office or home network infrastructure where a device can talk to each other or the internet.



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    Re: Modbus over TCP/IP and internet via Ethernet

    Oh I see. I'm looking more like the (A) connection.
    The MODBUS server doesn't provide any internet access and
    I needed a way for my device to send data to the internet, thus the (A) configuration.
    I'll read on the MODBUS via TCP/IP documents to see if there's any mention
    for (A) types of configuration.
    Any other help would be appreciated, thank you.



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