功能安全概述-Functional Safety overview.pdf

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2、s..¢theyallwanttheirprocesstoreactinacontrolledmannerincriticalconditionsandreducerisktopeople,theenvironment,andbusiness.©ABB-Page2FunctionalsafetyRiskinourworld©ABB-Page3FunctionalsafetySafety–thehottopic©ABB-Page4FunctionalsafetyDisastersthatmustnotbe

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4、criticalconditionsandreducerisktopeople,theenvironment,andbusiness.©ABB-Page6Functionalsafety“Functionalsafety”¢PartoftheoverallsafetyrelatingtotheEUCandtheEUCcontrolsystemwhichdependsonthecorrectfunctioningoftheE/E/PEsafety-relatedsystems,othertechnolog

5、ysafety-relatedsystemsandexternalriskreductionfacilities(IEC61508,part4)¢Theabilityofasafety-relatedsystemtocarryouttheactionsnecessarytoachieveasafestatefortheequipmentundercontrolortomaintainasafestatefortheequipmentundercontrol¢{Comparewithsafety:Free

6、domfromunacceptableriskofharm.}©ABB-Page7FunctionalsafetyWhydowehavesafetystandards?ToreduceRiskandtoprotectPeople,EnvironmentandBusiness!ExxonValdezaccidentinMarch1988LiquidgastankinMexicoCityexplodes;334die-1984RISK:-Acombinationoftheprobabilityofoccur

7、renceofharmandtheseverityofthatharm.©ABB-Page8FunctionalsafetyWhydowehavesafetystandards?¢FromIEC61508¢Safetyinstrumentedsystemshavebeenusedformanyyearstoperformsafetyinstrumentedfunctionsintheprocessindustries.Ifinstrumentationistobeeffectivelyusedforsa

8、fetyinstrumentedfunctions,itisessentialthatthisinstrumentationachievescertainminimumstandardsandperformancelevels.SAFETY:-FreedomfromunacceptableRisk!©ABB-Page9FunctionalsafetyWhythefocusonHighintegrityautomation¢Increased