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发表于 2012-3-28 08:21:31
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Failure Modes, Effects and Diagnostic Analysis(FMEDA)
FailureModes,EffectsandDiagnosticAnalysis
ManagementSummary
ThisreportsummarizestheresultsofthehardwareassessmentintheformofaFailureModes,Effects,andDiagnosticAnalysis(FMEDA)oftheMobrey2120VibratingForkPointLevelSwitch,hardwareandsoftwareasdescribedin[D1]-[D5].AFailureModes,Effects,andDiagnosticAnalysisisoneofthestepstobetakentoachievefunctionalsafetycertificationofadeviceperIEC
61508.FromtheFMEDA,failureratesandSafeFailureFractionaredetermined.TheFMEDAthatisdescribedinthisreportconcernsonlythehardwareofthe2120PointLevelSwitch.ForfullfunctionalsafetycertificationpurposesallrequirementsofIEC61508mustbeconsidered.
The2120PointLevelSwitchisa2/3-wiresmartdeviceusedtosensewhethertheprocesslevelisaboveorbelowaparticularpoint.The2120PointLevelSwitchcontainsself-diagnosticsandisprogrammedtosenditsoutputtoaspecifiedfailurestateuponinternaldetectionofafailure.
Table1givesanoverviewofthedifferentversionsthatwereconsideredintheFMEDAofthe2120PointLevelSwitch.
TableofContents
ManagementSummary2
1PurposeandScope.5
2ProjectManagement...6
2.1exida..6
2.2Rolesofthepartiesinvolved..6
2.3StandardsandLiteratureused.6
2.4Referencedocuments.7
2.4.1DocumentationprovidedbyMobreyMeasurement...7
2.4.2Documentationgeneratedbyexida7
3ProductDescription.8
4FailureModes,Effects,andDiagnosticAnalysis10
4.1FailureCategoriesdescription10
4.2Methodology–FMEDA,FailureRates11
4.2.1FMEDA..11
4.2.2FailureRates...11
4.3Assumptions..12
4.3.1UserConfigurationRestrictions...13
4.4Results13
5UsingtheFMEDAResults15
5.1PFDAVGCalculation2120PointLevelSwitch15
6TermsandDefinitions16
7StatusoftheDocument17
7.1Liability17
7.2Releases.17
7.3FutureEnhancements...17
7.4ReleaseSignatures.18
AppendixALifetimeofCriticalComponents..19
AppendixBProofteststorevealdangerousundetectedfaults.20
B.1SuggestedProofTest...20
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