advise regarding DP-DP couplers using with ABB AC800M redundant system and Siemns PLC.
Dear Rob, i need a advise regarding DP-DP couplers using with ABB AC800M redundant system and Siemns PLC.
Is it possible to have them in redundant structure?
Have you done it before?
With this topology, Profibus redundancy will not work as the 2 slaves (DP-DP couplers here) will not be able to monitor each other and do switchover. You can develop application based redundancy form the ABB side, I have no idea how it can be implimented on the Simens PLC. But it might go in a similar fashion.
From ABB applicaiton you can talk to both salves at all time and then use the logical selectors at I/O signals. The selection for which slave's data should be used can be either based on a "heartbeat" implimentaton or module status (if no communication on other side of DP-DP couples is reflected the status byte)
Hope this informaiton helps