Modbus over TCP/IP and internet via Ethernet

[dkeoki]

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.

 

[FvM]

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.

 

[dkeoki]

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.

 

[FvM]

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.

 

[dkeoki]

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.

 

[FvM]

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

 

[dkeoki]

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.

 

[Guns29]

Hello!
May help you Serial to Ethernet Connector redirects Modbus RTU over TCP/ IP to remote computers.
They, in return, display a virtual serial connection through which the software can communicate with the port.