s7 PLC to PLC communications

Hi,

I'm a novice on networking.

I want to set up communications between an existing 414CPU/CP443-1 (that is on an existing ethernet network) and a 315CPU/CP343-1 Lean that is not configured for any network.
they are both in separate s7 projects.

I don't have the full project (with symbols) for the 315 but have uploaded the station via its MPI port to a laptop. I noticed it has an assigned ip address (120.11.3.2) with subnet mask (255.255.255.0) i have an ethernet cable in place via a siemens OSM switch but can't see the 315 on simatic manager's 'accessible nodes'. should the subnet be (255.0.0.0)??

how do i set it all up within the s7 projects?
i was thnking of using the GET/PUT SFB's to transfer data... regarding these SFB's, where do i find the 'device ID' for the respective nodes?

many thanks

You should place both PLCs in the same STEP7 project.
Then in NetPro you can configure an S7 connection from the 414 to the 315. When you setup the connection, you can see the connection ID.
In the 414 you can then program PUT/GET blocks, specifying the ID from above.
You have to download the HW config with new connection to both PLCs.
Notice that you cannot program PUT/GET connections in the 315. This because the CP343-1 LEAN only supports "server" mode for S7 connections.

should the subnet be (255.0.0.0)??

Click to expand...

As far as I know about the subnet, you use it to split the adress into a network part and a client part.
So both 255.255.255.0 and 255.0.0.0 are valid. You should adjust the subnet to suit your local network setup.

as far as i know the subnet mask 255.255.255.0 will split the network & make an avaliabilty of 256 clients on the network.
whereas 255.0.0.0 will make 256x256x256 = 16.7M clints on the network...
i think it should be 255.255.255.0