Re: [SystemSafety] SIL ratings to be scrapped?

From: Matthew Squair < >
Date: Sat, 24 Aug 2013 13:55:01 +1000


That take up may be based more on a lack of understanding of its utility in non process control domains (low IMHO) or a judgement that it's an easy 'compliance = safety' argument that can be sold to defence customers who love a standards approach...

On Friday, 23 August 2013, RICQUE Bertrand (SAGEM DEFENSE SECURITE) wrote:

> It is interesting to see this evolution in UK while at the same time the
> major defense operators (DCNS, Nexter, EADS, …) in France are adopting
> IEC61508 straightforward and including it in their requirements, included
> for retrofits …****
>
> ** **
>
> *Bertrand RICQUE*****
>
> Program Manager, Optronics and Defense Division****
>
> ****
>
> *T* +33 (0)1 58 11 96 82****
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> *M* +33 (0)6 87 47 84 64****
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> 23 avenue Carnot ****
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> ** **
>
> *From:* systemsafety-bounces_at_xxxxxx > 'systemsafety-bounces_at_xxxxxx > systemsafety-bounces_at_xxxxxx > 'cvml', 'systemsafety-bounces_at_xxxxxx > Behalf Of *SPRIGGS, John J
> *Sent:* Friday, August 23, 2013 11:56 AM
> *To:* 'Inge, James Mr'; 'Bielefield SafetyList'
> *Subject:* Re: [SystemSafety] SIL ratings to be scrapped?****
>
> ** **
>
> The SILs of the Defence Standard were different from those of IEC61508,
> which fact I have seen cause problems on more than one project…****
>
> I would not be at all surprised if the chattering classes take a DEF.STAN.
> change made almost a decade ago as an indicator of an imminent change in
> 61508.****
>
> *From:* systemsafety-bounces_at_xxxxxx > systemsafety-bounces_at_xxxxxx > James Mr
> *Sent:* 23 August 2013 10:41
> *To:* Bielefield SafetyList
> *Subject:* Re: [SystemSafety] SIL ratings to be scrapped?****
>
> ** **
>
> It is possible that this rumour might relate to the current work underway
> to revise Def Stan 00-55, Requirements for Safety Related Software in
> Defence Systems.****
>
> ** **
>
> A system of SILs was defined Def Stan 00-56 Issue 2, Safety Management
> Requirements for Defence Systems (1996), which was also used in Def Stan
> 00-55. However, SILs were removed from the mandatory part of 00-56 in
> Issue 3 (2004) as part of the move to a goal-based approach to requirements
> setting. Instead, the guidance in 00-56 Part 2 discussed setting integrity
> requirements in generic terms, rather than using a specific SIL scheme.
> However, the guidance made it clear (in Annex C, section C.2) that SIL
> schemes could still be used where they were suitable. ****
>
> ** **
>
> Def Stan 00-55 was made obsolescent by the release of 00-56 Issue 3, and
> has not been re-issued. However, new work is currently underway to revise
> both standards. I have not seen recent drafts, but it is likely that
> neither standard will define a system of SILs, or require use of a specific
> SIL scheme. That said, it is also likely that use of suitable standard
> that incorporates SILs or a similar concept could still be part of the
> argument to demonstrate compliance with either 00-55 or 00-56.****
>
> ** **
>
> Regards,****
>
> ** **
>
> James Inge****
>
> ** **
>
> ** **
> ------------------------------
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Received on Sat Aug 24 2013 - 05:55:10 CEST

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