Hi,

In the CPU with the CP343-1 Lean, it is not possible to establish an active S7 connection and therefore no Put/Get instructions can be configured in this CPU for this communication path. In this case, a one-way connection is established from the S7-1500 to the S7-300 / CP.

Regards,

Towome

Hi,

at first, the picture for CP343-1 <-> S7-1500 is not really correct, because there is no client <-> client S7-communication.

One of the CPUs/CPs must always be set as server, the other as client.
But of course, as the CP343-1 allows you to use this also as client, you can configure an additional s7-connection as client.

Example as Screenshot.

As its always a Server <-> Client connection, there is not really a disadvantage in the communication itself, but it can be a disadvantage due to limitations of flexibility.

Example:
S7-communication between to PLC's which both of them only have an CP343-1 Lean. In this case both stations only supports server via this CP, so a communication via PUT/GET is not possible in this case If the internal DP interface of one the CPU can not be used for whatever reason..

It depends more on your process scenario and what you would like to achieve.

sancruz

Hello HBCM;

We might be quibbling about definitions here, but one thing has to be understood: in a client-server relationship there are no client-client application, there are no server-server exchanges.There are only client-server (active-passive) configurations. This is true in S7 comm setups, but lit applies to many computer-based exchanges such as OPC, WWW and email :https://en.wikipedia.org/wiki/Client%E2%80%93server_model

https://www.matrikonopc.com/resources/opc-server.aspx

Since a CP 343-1 Lean can only act as a server on PUT/GE applications, it must be connected to a S7 Comm client (for example a CP  341) and it will send and receive the data requested by the client. It will never initiate the requests.

A CP 341, on the other hand, can be configured both as a server and as a client. As a client, it can request data from a server. As sancruz' screenshot illustrtes, on a second connection the CP 341 can act as a server to another client. In his drawing both CP 341s are setup both as client and as server, on two separate connections. But always the PUT/Get exchanges will happen between a client nd a server, never between 2 clients.

Hope this helps,

Daniel Chartier

Hello HBCM;

i am sure that anuone here interested in client-server applications (such as PUT GET exchanges) would be very interested in how you managed client-client configurations. if you can please post screenshots frm your configuration.

You also add that the PUT GET instructions were programmed in both s7-1500 CPUs. In that casei would surmse that you are using a configuration that matches the following screenshot, with 2 parallel connections. PUT and GET can only be established with unilateral connections, from the client CPU (that includes PUT and GET instructions in its program) and a server. As discussed before, if both CPUs hare using PUT and Get, both can act as clients... but only with the server on the other CPU.

I would recommend you look at the following link, especially at the Documentation links available for different cnfigurations.

https://support.industry.siemens.com/cs/ca/en/view/82212115

That being said, since a client-client connection is not possible either in siemens programs or in any other client-srver applications, there is no point in discussing advantages of such configurations.

hope this helps,

Daniel Chartier