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| 11/5/2012 2:37 PM | |
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Posts: 94 Rating:
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Daer All, Can anybody explain me what is Fail-Safe and what is SIL3 system? Regards, Arunraje. |
| 11/5/2012 3:42 PM | |
Joined: 8/31/2005 Last visit: 4/23/2025 Posts: 2198 Rating:
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Failsave means you have a machine that can detect faults/fails and goes into a save position/mode/configuration if its detects one. (my words, no offical definition) SIL is the "Safty Integrity Level" This tells you how save your machine is (or should be). There are four SIL levels. In the factory automation normaly SIL 2 and SIL 3 are used. some links: http://en.wikipedia.org/wiki/Safety_Integrity_Level http://en.wikipedia.org/wiki/Functional_safety https://www.industry.siemens.com/topics/global/en/safety-integrated/machine-safety/why-safety/Pages/default.aspx https://www.industry.siemens.com/topics/global/en/safety-integrated/pages/functional-safety.aspx?HTTPS=REDIR |
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| 11/5/2012 3:57 PM | |
Joined: 9/27/2006 Last visit: 4/19/2025 Posts: 12346 Rating:
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Hello Arun; Both Failsafe systems (PLCs, relays...) and SIL 3 are terms that relate to machine safety. The international standard EN/IEC61508 ("Machine Safety") defines SafetyIntegrity Levels 1 to 4 based on different mathematical calculations on the acvailabiluity of the control system in case of faiure of a single component. See the description in Wikipedia: Safety Integrity Level - Wikipedia, the free encyclopedia EN/IEC 954-1 and newer ISO 13849 standards also define various levels of safety in machine control systems (Categories 0 to 4 in 854-1, PL a to e for 13849). There are many more threads on the subject on the forum, please feel free to search for them and look them up. Hope this helps, Daniel Chartier |
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| 11/5/2012 6:25 PM | |
Joined: 9/27/2005 Last visit: 4/12/2025 Posts: 203 Rating:
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Hello Arunraje, you solve your automation task with a SIMATIC PLC (for example). But maybe there are some functions in your application, which will be dangerous for people, hardware or environment. In this case you have some additional tasks to do with the effect to protect people, hardware or environment. If you want to solve this safety requirements, you need a Safety Function. To realize a safety function you need a fail safe system, in the example upon: Use a failsafe-CPU (one part of a failsafe system). Different applications, different hazard. SIL (Safety Integrated Level) is a range with gives you the information how much your application is protected. The requirements of the SIL depends on the risk for a damage in error case. SIL is from the norm IEC 61508 respective IEC 62061 (factory automation). You find a very good example here: http://support.automation.siemens.com/WW/view/de/23996473 Greetings Morten |
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