SIL and PL | History and Distinction - Pepperl+Fuchs

Speaking of ways to rate systems for use in today's safety applications, the acronyms SIL (safety integrity level), PL (performance level), and SILCL (SIL ... Beginswith... Contains... ServicelineIndustrialSensors ServicelineExplosionProtection Products IndustrialSensors ProximitySensors PhotoelectricSensors IndustrialVision UltrasonicSensors RotaryEncoders PositioningSystems InclinationandAccelerationSensors VibrationMonitoring IndustrialCommunication IdentificationSystems DisplaysandSignalProcessing Connectivity Accessories Software ExplosionProtection IntrinsicSafetyBarriers SignalConditioners FieldConnexEthernet-APLandFieldbusInfrastructure RemoteI/OSystems HARTInterfaceSolutions SurgeProtection WirelessSolutions IntrinsicallySafeMobileDevices HMISystems ElectricalExplosionProtectionEquipment Purge+PressurizationSystems PowerSupplies LevelMeasurement Software QuickandEasy Useourselectiontoolandquicklyfindtherightproductforyourapplication. 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Blog CountrySelect English Deutsch Español HomeExplosionProtectionTechnologiesFunctionalSafety—SafetyIntegrityLevel(SIL)andPerformanceLevel(PL)SafetyIntegrityLevel(SIL)andPerformanceLevel(PL)—HistoryandDistinction Speakingofwaystoratesystemsforuseintoday’ssafetyapplications,theacronymsSIL(safetyintegritylevel),PL(performancelevel),andSILCL(SILclaimlevel)cometomind.Inthefirstplace,thisonlyseemstomakethetopicmorecomplicatedtocomprehend,butultimatelythisdistinctioncanbeunderstoodwhentheirevolutionandtheirbackgroundareilluminated. IEC61508andIEC61511—DrivenbyChemicalIndustries ThedevelopmentofthestandardsIEC61508andIEC61511forfunctionalsafetywasencouragedandsupportedmainlybythechemicalindustry.Astraditionalstandardswerebasingsafetyonspecialsystemarchitecturesorregulartesting,theapplicationofsafetyPLCswasnotpossibledirectly.Programmeddevicescaninheritdeficienciespopularlyknownas‘bugs’,whichhavetheproblematicfeaturethatinredundanciesasimultaneousfailurecannotreallybeexcluded. Theideawastobasesafetystatementsontheprobabilityforreliablefunctionincaseanydemandforasafereactionwasgiven.Withthedeterminationofcertainrulesforastructuredapproachindevelopmentandtestingofhardwareandsoftware,thestandardsprovidedasystemthathasproventobesuitableforsafetyapplicationsthroughouttheyears. CloseRelationsBetweenSafetyStandards However,whilethechemicalindustrymostlyfacesrisksthatneedasafetyrelatedreactioneveryfewyearsorevenlessfrequent,thesafetysystemsinmachinerycanbedemandedveryoftenorcontinuallywhenthemachineisused.ThisiswhyISO13849-1wasdevelopedbasedonthementionedtraditionalstandardswhileadditionallyopeningthewayfortheuseofsafetyPLCsbyincludingtheprobabilisticapproach.Withthisstandard,thenecessitiesevolvingfromthemachinerydirectivewerecoveredaswell. Asthelastparagraphalreadyshows,therearecloserelationshipsbetweenthementionedstandards.AndsotherearenotonlytheacronymsSILfromtheIEC61508andPLfromtheISO13849buttherealsoisaSILCLdefinedinIEC62061whichisalsousableinthemachineryworldbutclosertotheSILworldwithprogrammabledevices. PlantSafetyandMachinerySafety—TwoSidesofOneCoin Machinerydirective2006/42/EGregulatessafetyrequirementsonmachineryandinstallationsthatarebroughtontothemarketintheEuropeanUnion.Whichproductsareunderthedirectiveispreciselynamed.Incomparisontothepreviousversion,thenewdirectiveislayingmorestressonanextensiveriskassessmentofthemachinery,whichincludesanextensiveriskanalysis.Atthesametimeinfacilitatesamethodforasimplifiedconformityassessmentformachinerywhenusingharmonizedstandards. ThesestandardsincludethementionedENISO13849seriesandtheENIEC62061,whichregulateestablishingthefunctionalsafetyofsafetyrelatedandprogrammableelectroniccontrolsystems. BothofthesestandardsarecloselylinkedtothestandardsENIEC61508forfunctionalsafety,whichgiveaframeworkincludingnecessitiesforsafetymanagementlikedefinitionofprocesses,regulationofresponsibilitiesandorganizationalmeasures.ThisiswhytheENIEC61508standardsarealsocitedwhenthestandardsforsafetyfunctionsunderthemachinerydirectivedefinehigherrankedsafetyfunctions.Inconjunctionwithfurtherspecificsafetystandards,anetworkevolvesthathasinfluenceonallpartsofmachine andplantsafety.Aimofallthesemeasuresistheimplementationofsuitablesafetyfunctionsforthemachineandplantsafetysector. MoreInformationonFunctionalSafety Pepperl+Fuchsprovidessolutionsforbothsidesofthiscoinandoffersamanifoldofdevicesthatmightbejustwhatyouneedforyourapplication.Pleaseuseourselectiontooltofindthesuitablesafetydevicesordigdeeperintosafetyknowledgebyclickingthelinksbelow. SafetyProductSelectorSafetyIntegrityLevel(SIL)PerformanceLevel(PL) GoTo IndustrialSensors ExplosionProtection QuickLinks News ServiceLevelAgreementsforecominstruments WheretoBuy BrowseLiterature Technologies ControlSystemSolutions DownloadTechnicalDocuments PressReleases InternationalTradeShows VisittheFunctionalSafetyHub SeveralhundredproductswithaSIL/PLassessment,freetools,andbrochuresinoneplace: the"FunctionalSafetyHub"isyourstartingpointwhenyouhavetoimplementsafetyfunctions. Approvals+Certificates CertificationFunctionalSafetyManagement(PDF,0.1MB) Pepperl+FuchsSELilienthalstraße20068307MannheimGermany [email protected]  +49621776-0 HomeIndustrialSensorsExplosionProtectionProductsMarketsContactUs AboutUsCareersWhat'sNew? Amplify SelectCountry Sitemap LegalNoticeDisclaimer PrivacyPolicy ©2022AllRightsReserved. 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