Hi all,

I'm working on a project with 2 PLC station, each included: CPU 313C-2DP and CP343-1 Lean. I need to exchange data between two PLCs, and as I know there is a good way by using S7-connection and use PUT and GET function in the CP-300 Library.

But when I assign connection between two stations in NetPro Config, choose S7 connection, there was an error message:

"Insert New Connection (276:27)

No valid connection could be established..."

When I check in Hardware Config, CPU properties - Connection: S7 communication: 0 (already configured).

I don't know how to establish this S7 connection for my purpose. Could anyone possibly help me to sort this out?

Toan Nguyen Thi

Hi all,

I'm working on a project with 2 PLC station, each included: CPU 313C-2DP and CP343-1 Lean. I need to exchange data between two PLCs, and as I know there is a good way by using S7-connection and use PUT and GET function in the CP-300 Library.

But when I assign connection between two stations in NetPro Config, choose S7 connection, there was an error message:

"Insert New Connection (276:27)

No valid connection could be established..."

When I check in Hardware Config, CPU properties - Connection: S7 communication: 0 (already configured).

I don't know how to establish this S7 connection for my purpose. Could anyone possibly help me to sort this out?

 Hello,

The CP 343 Lean is only "server" in S7 connection try with ISO on TCP connection:

How do you configure an ISO-on-TCP connection for data exchange ...

Please have a look the difference between CP:

http://support.automation.siemens.com/WW/view/en/16767769

Explanation of CP343-1 Lean by our Expert Fritz:

how to communicate between CPU315-2DP with CP 343-1 lean and IM151

Thank you Ste39,

I tried ISO-on_TCP connection for communication between two PLCs and further test data exchange between PLC and PC with Libnodave library