CEI IEC 61508 7

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1、61508-7©IEC:19971Version4.005/12/97COMMISSIONCEIELECTROTECHNIQUEIECINTERNATIONALE61508-7INTERNATIONALELECTROTECHNICALCOMMISSIONFunctionalsafetyofelectrical/electronic/programmableelectronicsafety-relatedsystemsPart7:Overviewoftechniquesandmeasures61508-7©IEC:19972Ver

2、sion4.005/12/97ContentsForeword...................................................................................................................................10Introduction...........................................................................................

3、.....................................111Scope...................................................................................................................................132Definitionsandabbreviations.............................................................

4、......................................15AnnexA(informative)OverviewoftechniquesandmeasuresforE/E/PES:controlofrandomhardwarefailures(referencedbypart2).........................................................................................16A.1Electrical............

5、..........................................................................................................16A.1.1Failuredetectionbyon-linemonitoringofequipmentundercontrol.........................16A.1.2Mechanicallyinterlockedrelays...................................

6、.......................................16A.1.3Comparator......................................................................................................16A.1.4Majorityvoter.........................................................................................

7、...........17A.1.5Idlecurrentprinciple(de-energisedtotrip)...........................................................17A.2Electronic.....................................................................................................................17A.2.1Testsbyredu

8、ndanthardware.............................................................................17A.2.2Dynamicprinciples.................