I am using a S7-1200 1215C CPU configured as a Slave on TIA Portal V13. The master is a 3rd party Device. I have already referred to the Sample Program and the description given in this link:https://support.automation.siemens.com/WW/llisapi.dll?func=cslib.csinfo&lang=en&objid=47756141&caller=view

But I still have no idea how is the Slave_Data DB block (that is being pointed by MB_SLAVE block) configured. I don't exactly know what does Receive_0, Receive_1, Send_0 and Send_1 mean. I am assuming that the first register (say 400001 Holding Register) sent by the Master is stored in Recieve_0 in the slave PLC, second 400002 in Receive_1 and so on. If so, how to access those data registers and bits into the main program, once it arrives at Receive_0 and Receive_1?

I hope I have explained the problem properly. Please do not hesitate to ask if you have any further doubts.

Cheers.

Parshva