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11/9/2012 2:40 PM | |||||
Joined: 9/27/2006 Last visit: 9/23/2024 Posts: 12282 Rating: (2685)
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Hello r2407; As already pointed our by playerslight, you can only have Software Redundancy if you are using S7-300 PLCs. With SR you will need to use a standard communication channel (MPI, Profibus-DP through a CP, or Industrial Ethernet through a CP) to establish a redundancy link between the 2 CPUs. This means a long switchover time, measured in seconds. This is what is generally called a warm-redundant system. And you will have to program the redundancy exchanges between the 2 CPUs in dedicated blocks that you will be responsible for. You will find a lot of information on the Software Redundancy package here:
If you want a more reliable and faster (and also costlier...)hot-backup system, with a dedicated fiber-opticredundancy link and automatic management of data transfer between primary and standby CPUs, look at the s7-400H systems. SIMATIC Fault-tolerant systems S7-400H Hope this helps, Daniel Chartier |
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