I'm trying to communicate three PLC S7-300 s each with a CP 342-5 module. The network and have configured, it works, but I can not figure out how to communicate with each slave master separately. It is a practice of industrial communications and is an extension of a master-slave network that I made ​​and that by DP_RECV DP_SEND and works perfectly.

I wanted to try out three PLC-s. As I said, the network is configured, no error or system bus, but can not find how to set having a common memory area or obtain the same from DP_SEND, DP_RECV but with two slaves.

Please if you have a tutorial, if it works, to communicate slave master and vice versa, as I do?

regards