Navigation
how to establish communication between two cpu 414 2dp,when one cpu fails..
Created by: Mahesha.S at: 8/23/2012 8:22 PM (1 Replies)
Rating 
Thanks 0
2 Entries
| 8/23/2012 9:17 PM | |
Joined: 9/27/2006 Last visit: 4/19/2025 Posts: 12346 Rating:
|
Hello Mahesha; To establish a Fault-Tolerant system (hot-backup of CPUs) in Siemens' world you have to think of S7-41xH CPUs in tandem with F.O. synchronisation modules, and H-block programming. This allows for cyclic copy of all the registers in the main CPU to the backup CPU so that you can have usecond switchover times in case of failure. Since your CPUs are standard, not H-systems, your alternative is to use Software Redundancy with standard CPUs and communication processors to setup a warm-backup configuration. This is not as powerful as H-systems, and switchover will be measured in milliseconds, or even seconds if you choose MPI as a redundancy interface. But you can set it up with the equipment you have now (please examine the FAQ below and see if your CP 443-1 is included in the supported hardware, just to make sure). Have a look at the following documents: Which modules can you use when implementing software redundancy? SIMATIC S7-300/S7-400 Software redundancy for SIMATIC S7 If you do a search on the forum on Software Redundancy (or SWR) using the Search box at the right, you will see that many users of SWR have had many questions about the configuration and programming of the required blocks. Notice also that they have had much support and great answers, which you can count on too. Hope this helps, Daniel Chartier |
Last edited by: dchartier at: 8/23/2012 11:16 PM |
|
Follow us on