Communication btw CPU312 with CP343 lean and CPU313 with cp343-1 by profinet

Just one question, you want to write to an IP Address, do you have an Ethernet CP in your PLC? If you do not have a CP you have no IP Address anyway.

The Communication you can use, if you have no CP, is MPI, in this case you can use X_PUT / X_GET. If you have a CP this is another Story. (By the way, if you have a CP you can not use SFC or SFB for Communication)

Best regards

as you have a CP this is a totally different Story. Here you need the AG_SEND / AG_RECEIVE Functions (FC 5 / FC 6) of the SIMATIC NET Library. These functions can be used for the ISO on TCP; TCP or UDP Protocol.
If you want to use S7 Functions, only actively used by the newer CPs (not Lean CP), you have to use the FB’s PUT or GET form the same Library to read or write Data from a remote PLC.

To use all these functionalities you have to configure Connections in NetPro. As mentioned you can use either

ISO on TCP Connection
TCP Connection
UDP Connection
S7 Connections. (With CP 343-1 Lean only as Server (This type of connection can not be configured))

Best regards

Wizard is right, if you have a Connection configured in NetPro in between the two CP’s you have a Connection ID that you have to set in the Parameter ID in the FC5 and FC6. Please make sure that the ID is the right one for each CPU because this ID can differ.

The easiest way would be to select the Connection. This can be done like this:

Select the FC in your Program. Press the right Mouse button and select "Connections..." Now you can select the Connection you want to use. The Connection does not show the IP Addresses in the Function, only during the Configuration in Netpro.

Best regards