9/16/2011 8:01 PM | |
Posts: 2 Rating: (0) |
Hello Fritz, I read your answer about F series and now can understand a bit about Failsafe PLCs from Siemens. If I was to connect say a 315F using PROFIsafe to Siemens Remote I/O then in theory I would have a SIL3 rating to the RIO. I realise that it then depends on the loop to the instrument etc. but the Siemems PLC + Profisafe + RIO would all be SIL3 - would you agree? I have not used ProfiSafe before so please excuse my ignorance. Cheers Mark Splitted from Simatic fails safe PLC. |
Last edited by: O_Moderator at: 9/19/2011 8:06 AMnew subject after splitting |
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9/17/2011 2:30 PM | |
Joined: 10/7/2005 Last visit: 4/23/2024 Posts: 3004 Rating: (1046)
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Hello GCAL SIL3 is certainly achievable in this case, but you will still need to do your "homework" (Spurlines for example are not allowed in a Profibus based PROFIsafe network). Since PROFIsafe is governed by PI (Profibus International), a good starting pointto learn more about it is the link below and I hope this helps: http://www.profibus.com/technology/profisafe/overview/ |
Cheers |
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10/31/2011 11:59 AM | |
Joined: 10/7/2005 Last visit: 4/23/2024 Posts: 3004 Rating: (1046)
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Hello GCAL
Simple answer: Because a standard CPU with standard I/O via standard Profibus does NOT meet Safety related Categories/SIL's (Safety Integrity Level)/PL's (Performance Level).
I can't tell you why as I don't know your requirements andhaven't been part of any Hazard identification nor Risk Assesmentetc. etc. I'm also not aware of a "Zone"rating with regards to Safety, but do instead associate the term "Zones" withExplosionratings/protection levels. Perhaps your application isn't a safety related on, but this is something that you need to determine in accordance with the Standards that apply in your country.
Basically yes.
If you need Functional Safety (Siemens terminologyfor all things safety related)in your application, you simply can NOT use a Standard PLC with Standard I/O (it is what it is,there is noneed to justify this). Note that you must also consider the whole safety chain, from sensor selection, through the wiring, Fieldbus communciation if applicable (e.g. Profisafe), input card(e.g.F-DI), Logic evaluation (e.g. F-CPU andsafety program), Fieldbus communciation if applicable (e.g. Profisafe), output card (e.g.F-DQ)and finally actuator selection. For more on this, allow me to direct you to the link below where you'llfinda wealth of information on this subject: Siemens Functional Safety homepage I hope this helps |
Cheers |
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