Could anybody please shed some light as to what are the steps in making a communication between Compactlogix 1768-L30ER CPU and Siemens S7 CPU with PS69-DPS PROFIBUS Slave Module from Prosoft. I have tried reading the manual from Prosoft but since I have never done this before, it's difficult for me to understand the steps for the "handshake" between two PLCs and the exchange of the data.