Re: [SystemSafety] SIL 4 and IEC 61131-3 languages

From: Daniel Grivicic < >
Date: Fri, 18 Mar 2016 23:58:49 +1100

Dear Bertrand,

If you assume that the devices which use IEC61131-3 are typical of the industry, then you will find that SIL3 is possible and widely found however SIL4 is not. I am not aware of any PLC that is capable of SIL4 and is software configurable. The 3 such devices I am aware of use logic cards and are hard wired.

Sorry I cannot assist much more.



On Thu, Mar 17, 2016 at 11:30 PM, RICQUE Bertrand (SAGEM DEFENSE SECURITE) < bertrand.ricque_at_xxxxxx

> Given the experience and knowledge existing on assessing SIL 4 or DAL A
> systems based on ADA or C++, do you estimate that the same result
> (compliance) is achievable with the IEC61131-3 proprietary languages ?
> Same question for SIL 3 / DAL B.
> Thank you,
> Bertrand Ricque
> Program Manager
> Optronics and Defence Division
> Sights Program
> Mob : +33 6 87 47 84 64
> Tel : +33 1 58 11 96 82
> Bertrand.ricque_at_xxxxxx >
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