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3/17/2009 3:45 PM | |
Joined: 9/27/2006 Last visit: 9/22/2024 Posts: 12282 Rating: (2684)
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Hello Eastern; The closest I can find to your request is the following manual on failsafe I/O modules: http://support.automation.siemens.com/WW/view/en/19026151 It discusses the SIL2 and SIL3 I/O modules in terms of voting configurations and certifications from TUV and Namur (what is required to make these I/O modules "SIL rated"). Siemens does not propose SIL4 systems in their offerings. This could be because...: http://www.gmigasandflame.com/sil_faqs.html SIL 4 systems are typically so complex and costly that they are not economically beneficial to implement. Additionally, if a process includes so much risk that a SIL 4 system is required to bring it to a safe state, then fundamentally there is a problem in the process design which needs to be addressed by a process change or other non-instrumented method. From the SIL Ressource Center FAQs page. Hope this helps, Daniel Chartier |
This contribution was helpful to2 thankful Users |
3/17/2009 4:15 PM | |
Posts: 557 Rating: (64) |
Thank a lot sir............. regards |
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