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1/3/2011 6:46 AM | |
Posts: 7 Rating: (0) |
this answer is ok thanks |
1/3/2011 6:48 AM | |
Posts: 7 Rating: (0) |
but i need to know what are the differences between ordinary O/p module and fail safe O/p module ? |
1/3/2011 3:51 PM | |
Joined: 9/27/2006 Last visit: 10/17/2024 Posts: 12289 Rating: (2687) |
Hello remon; The basic answer to your question would be: Failsafe I/O modules can only be used by a Safety program inside your F-CPU. Although a F-CPU can have both a safety and a non-Safety program running concurrently, only failsafe I/O can be evaluated by a Safety program, and only Failsafe I/O are constructed to be evaluated by a F-CPU.. For more (and more complete) information on the subject you should look at the following manual, from which i have extracted a small portion of the introduction: SIMATIC Automation System S7-300 ET 200M Distributed I/O Device Fail-safe signal modules 1.2 Using Fail-Safe Signal Modules Fail-safe automation system Fail-safe automation systems (F-systems) are used in plants which are subject to more stringent safety standards. F-systems are used to control processes and to force the plant into a safe state after shutdown. That is, F-systems control processes which do not pose a risk to human beings or to the environment when shut down immediately. Fail-safe signal modules Compared to standard modules of the S7-300 module family, the fail-safe signal modules differ in terms of their internal dual-channel structure. The two integrated processors monitor each other, automatically test the I/O circuits, and force the fail-safe signal module into safe state when a fault/error has been detected. The F-CPU communicates with the fail-safe signal module by means of the safety-oriented PROFIsafe bus profile. Hope this helps, Daniel Chartier |
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