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12/27/2010 11:43 PM | |
Joined: 7/2/2008 Last visit: 8/26/2024 Posts: 928 Rating: (308)
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Hello Chander, A pair of S7-315-2DP can be used to make what so called software redundancy solution or in other words warm standby system. The switching time between the 2 (redundant) CPUs is supposed to be few seconds. There's no real time synchronization between the 2 CPUs and data synchronization timedepends on the type of redundant link between the 2 CPUS which can bebuilt over Ethernet orover RS485 link (MPI or PROFIBUS). During switching over the outputs are frozen until the standby CPU takes over. More info. to be found in SWR manual. For a hot stanby application, the S7-400H comes to play. The switching time in case of 400H is few msec. The 400H uses a unique technique to synchronize data between the 2 CPUs. Synchronization takes place in the background without any effecton user program and is done over a fiber optic connection between the 2 CPUs. More info. to be found in S7-400H manual. Best regards. H-H |
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