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Dear List, I have the following configuration: [HMI Client] [HMI Client] // WinCC = RT128 | | [HMI-Server]-------------+---------------------+ // TCP/IP = Network + WinCC RT1024 + WinCC/Server + CP 5613 (in PC) | +--------------------+----------------------+ // Profibus = Network(A) | | {PLC1} {PLC2} // CPU: S7 = 318-2DP | | // = Profibus-DP Network(B) | | +--{ET1a} +--{ET2a} // ET200M | | +--{ET1b} +--{ET2b} | | +--{ET1c} +--{ET2c} | | +--{ET1d} +--{ET2d} | +--{ET1e} Both CPUs are master and have different sub net with ET200 stations. The two CPUs cater to different process areas in plant. Some of the process variables are coming from PLC1 and some from PLC2. Quite a few of the interlocks require that I have process values from both PLCs. I want to transfer some data from PLC1 to PLC2 and vice versa. How can I accomplish this using the Profibus Network(A) (ie the one connecting the two PLC and the HMI-Server). The source is 01 Data Block, about 75 - 100 data words. Would I be required to connect the MPI ports of the two PLCs (they are physically quite close - same control room) or can I use the Profibus network (A) for this scheme? Shahid Waqas Chaudhry Email: <[email protected]>