: H PS[ XL ? V K L Y % 9 MML J ZY H U K 8 PH N U V Y ZPJ ... - r. stahl

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Appendix 3: Failure rates according to IEC 61508:2010 Table 1: Failure rates Failure category Failure rates (in FIT) Fail Safe Detected ( SD) 0 Fail Safe Undetected ( SU) 43 Fail Safe Undetected ("SU) 0 Fail Low (L) 43 Fail Dangerous Detected ( DD) 0 Fail Dangerous Undetected ( DU) 3 Fail Dangerous Undetected ("DU) 3 Fail High (H) 0 Fail Annunciation Undetected ("AU) 17 No effect 33 No part 15 Total failure rate (safety function) 46 SFF 93% SIL AC SIL3 © %)&$"!#(' GmbH appendix 3_<strong>stahl</strong> 9167 04-04-03 r005 v2r1.doc, April 17, 2012 Jan Hettenbach Page 2 of 3
Table 2: PFDAVG Values Configuration T[Proof] = 1 year T[Proof] = 3 years T[Proof] = 5 years T[Proof] = 10 years 9167 PFDAVG = 2,23E-05 PFDAVG = 4,34E-05 PFDAVG = 6,46E-05 PFDAVG = 1,17E-04 The listed PFDAVG values are calculated for a proof test coverage of 90%. Figure 1: PFDAVG (t) © %)&$"!#(' GmbH appendix 3_<strong>stahl</strong> 9167 04-04-03 r005 v2r1.doc, April 17, 2012 Jan Hettenbach Page 3 of 3
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