INTERNATIONALSTANDARDIEC61511-2Firstedition2003-07Functionalsafety–Safetyinstrumentedsystemsfortheprocessindustrysector–Part2:GuidelinesfortheapplicationofIEC61511-1ReferencenumberIEC61511-2:2003(E)COPYRIGHT2003;InternationalElectrotechnicalCommissionDocumentprovidedbyIHSLicensee=AgipKOC/5950653001,User=,09/30/200305:06:03MDTQuestionsorcommentsaboutthismessage:pleasecalltheDocumentPolicyGroupat1-800-451-1584.--`,,``,,,````,``,```,`,,,`````-`-`,,`,,`,`,,`---PublicationnumberingAsfrom1January1997allIECpublicationsareissuedwithadesignationinthe60000series.Forexample,IEC34-1isnowreferredtoasIEC60034-1.ConsolidatededitionsTheIECisnowpublishingconsolidatedversionsofitspublications.Forexample,editionnumbers1.0,1.1and1.2refer,respectively,tothebasepublication,thebasepublicationincorporatingamendment1andthebasepublicationincorporatingamendments1and2.FurtherinformationonIECpublicationsThetechnicalcontentofIECpublicationsiskeptunderconstantreviewbytheIEC,thusensuringthatthecontentreflectscurrenttechnology.Informationrelatingtothispublication,includingitsvalidity,isavailableintheIECCatalogueofpublications(seebelow)inadditiontoneweditions,amendmentsandcorrigenda.Informationonthesubjectsunderconsiderationandworkinprogressundertakenbythetechnicalcommitteewhichhaspreparedthispublication,aswellasthelistofpublicationsissued,isalsoavailablefromthefollowing:•IECWebSite()•CatalogueofIECpublicationsTheon-linecatalogueontheIECwebsite()enablesyoutosearchbyavarietyofcriteriaincludingtextsearches,technicalcommitteesanddateofpublication.On-lineinformationisalsoavailableonrecentlyissuedpublications,withdrawnandreplacedpublications,aswellascorrigenda.•IECJustPublishedThissummaryofrecentlyissuedpublications()isalsoavailablebyemail.PleasecontacttheCustomerServiceCentre(seebelow)forfurtherinformation.•CustomerServiceCentreIfyouhaveanyquestionsregardingthispublicationorneedfurtherassistance,pleasecontacttheCustomerServiceCentre:Email:custserv@iec.chTel:+41229190211Fax:+41229190300COPYRIGHT2003;InternationalElectrotechnicalCommissionDocumentprovidedbyIHSLicensee=AgipKOC/5950653001,User=,09/30/200305:06:03MDTQuestionsorcommentsaboutthismessage:pleasecalltheDocumentPolicyGroupat1-800-451-1584.--`,,``,,,````,``,```,`,,,`````-`-`,,`,,`,`,,`---INTERNATIONALSTANDARDIEC61511-2Firstedition2003-07Functionalsafety–Safetyinstrumentedsystemsfortheprocessindustrysector–Part2:GuidelinesfortheapplicationofIEC61511-1IEC2003Copyright-allrightsreservedNopartofthispublicationmaybereproducedorutilizedinanyformorbyanymeans,electronicormechanical,includingphotocopyingandmicrofilm,withoutpermissioninwritingfromthepublisher.InternationalElectrotechnicalCommission,3,ruedeVarembé,POBox131,CH-1211Geneva20,SwitzerlandTelephone:+41229190211Telefax:+41229190300E-mail:inmail@iec.chWeb:МеждународнаяЭлектротехническаяКомиссияCOPYRIGHT2003;InternationalElectrotechnicalCommissionDocumentprovidedbyIHSLicensee=AgipKOC/5950653001,User=,09/30/200305:06:03MDTQuestionsorcommentsaboutthismessage:pleasecalltheDocumentPolicyGroupat1-800-451-1584.--`,,``,,,````,``,```,`,,,`````-`-`,,`,,`,`,,`---–2–61511-2IEC:2003(E)CONTENTSFOREWORD..........................................................................................................................4INTRODUCTION....................................................................................................................61Scope..............................................................................................................................82Normativereferences.......................................................................................................83Terms,definitionsandabbreviations................................................................................84ConformancetothisInternationalStandard.....................................................................85Managementoffunctionalsafety......................................................................................95.1Objective................................................................................................................95.2Requirements.........................................................................................................96Safetylifecyclerequirements..........................................................................................156.1Objective...............................................................................................................156.2Requirements........................................................................................................157Verification.....................................................................................................................157.1Objective..............................................................................................