CEI IEC 61508 6

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1、61508-6ãIEC:19971Version4.005/12/97COMMISSIONCEIELECTROTECHNIQUEIECINTERNATIONALE61508-6INTERNATIONALELECTROTECHNICALCOMMISSIONFunctionalsafetyofelectrical/electronic/programmableelectronicsafety-relatedsystemsPart6:Guidelinesontheapplicationofparts2and361508

2、-6ãIEC:19972Version4.005/12/97ContentsForeword....................................................................................................................................6Introduction....................................................................

3、.............................................................81Scope...................................................................................................................................102Definitionsandabbreviations..............................

4、.....................................................................12AnnexA(informative)Applicationofparts2and3........................................................................13A.1General..............................................................

5、..........................................................13A.2Functionalsteps...........................................................................................................15AnnexB(informative)Exampletechniqueforevaluatingprobabilitiesoffailure..

6、...............................21B.1General........................................................................................................................21B.2Averageprobabilityoffailureperdemand(forlowdemandmodeofoperation).....................23B.2

7、.1Procedureforcalculations..................................................................................23B.2.2Detailedtablesforlowdemandmodeofoperation................................................26B.2.3Examplesforlowdemandmodeofoperation.............

8、..........................................30B.2.4Architecturesforlowdemandmodeofoperation..................................................33B.3Probabilityoffailureperhour(forhighdemandor