How we can transfer and receive data s between two s7 300 plc(both are cpu315-2).?. Here we are connecting the two plc by profibus cable in MPI port only..

Can anyone give me suggestions?..

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Split from Communication between S7-300 .

Hello,

you can use a S7-communication.

At this manual for communication between 2 S7-300 can you find some description for the communication.

Hope this is helpful.

regards
CaOd

Hello narasim;

Unfortunately, for S7 Communication (Get/Put) for example), a S7-300 can only act as a server, and only with a CP 342-5 in the CPU racks (you need a client in the application, such as a S7-400 CPU).

Which types of connection/protocols do the S7-300/400 CPUs and the CPs support by default?

https://support.industry.siemens.com/cs/ww/en/view/24352751

If you need to program data exchanges between 2 CPUs 315-2DP connected with a Profibus cable, it would seem easier to use Profibus master-slave connections. Here is a discussion from a few years back with general explanations on the subject, followed by an example of how to use a S7-400 master with a S7 315-2DP slave (you can use a CPU 315-2DP instead of the S7-400 in the example for your project):

Two 315-2DP CPUs Profibus Master-Slave communication

https://support.industry.siemens.com/tf/ww/en/posts/two-315-2dp-cpus-profibus-master-slave-communication/55078?page=0&pageSize=10

DP link between CPU 315-2DP (slave) and S7-400 (master) with STEP 7 V5.3

https://support.industry.siemens.com/cs/ww/en/view/6518822

Hope this helps,

Daniel Chartier

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