Connect two PLCs to one HMI on profibus

Hi, I need to connect two PLCs to one HMI TP1500 Comfort. I now that I can do a new connection on wincc, but I believe that I can't connect the two connections of the two profound networks to one single port in the HMI. Or is this possible?

Hello dacastillo;

Do you mean how you need to connect the 2 PLCs physically to the single Profibus port on your HMI?

The screenshot below shows the "normal" way to setup a Profibus-DP network, using Profibus cable and connectors. Profibus-DP uses a daisy-chain, linear bus configuration, You could c0nnect PLC1, then PLC2, the the HMI; Or PLC1, HMI, PLC2. or... It all depends on the topography of your plant, connect the closest nodes as they present themselves, logically. Termination is generally available directly on the Profibus connectors; the first and the last physical nodes must have the terminator switch at ON.

The figure is taken from the Profibus-DP Installation Guidelines, from Profibus.com, a document you should look at for more information on the subject of Profibus networks.

https://www.profibus.com/download/profibus-installation-guidelines/

Hope this helps,

Daniel Chartier

Hi.

Get a Profibus connector.
(Example: https://support.industry.siemens.com/cs/pd/128977)
It follows the the daisy-chain idea that Mr Chartier mentioned.

My problem is more how I connect and configure two plcs on one profibus subred and how they communicate with the screen.

I think my best option is to use a DPDP coupler, but I am locking if there's another way of do this whitout the coupler.

 Hello dacastillo;

dacastillo

Hi, I need to connect two PLCs to one HMI TP1500 Comfort. I now that I can do a new connection on wincc, but I believe that I can't connect the two connections of the two profound networks to one single port in the HMI. Or is this possible?

 In WinCC, create two connections, one to each controller over Profibus, each with the Profibus address of the PLC you want to exchange data with. See this forum discussion for more information:

Connecting One HMI to Two PLCs

https://support.industry.siemens.com/tf//ww/en/posts/connecting-one-hmi-to-two-plcs/210052?page=0&pageSize=10

Create tags for each of the controllers, use these to read and write to each PLC in your screens.

Hope this helps,

Daniel Chartier