IECTR61511-4Edition1.02020-02TECHNICALREPORTFunctionalsafety–Safetyinstrumentedsystemsfortheprocessindustrysector–Part4:ExplanationandrationaleforchangesinIEC61511-1fromEdition1toEdition2IECTR61511-4:2020-02(en)®THISPUBLICATIONISCOPYRIGHTPROTECTEDCopyright©2020IEC,Geneva,SwitzerlandAllrightsreserved.Unlessotherwisespecified,nopartofthispublicationmaybereproducedorutilizedinanyformorbyanymeans,electronicormechanical,includingphotocopyingandmicrofilm,withoutpermissioninwritingfromeitherIECorIEC'smemberNationalCommitteeinthecountryoftherequester.IfyouhaveanyquestionsaboutIECcopyrightorhaveanenquiryaboutobtainingadditionalrightstothispublication,pleasecontacttheaddressbeloworyourlocalIECmemberNationalCommitteeforfurtherinformation.IECCentralOfficeTel.:+412291902113,ruedeVarembéinfo@iec.chCH-1211Geneva20www.iec.chSwitzerlandAbouttheIECTheInternationalElectrotechnicalCommission(IEC)istheleadingglobalorganizationthatpreparesandpublishesInternationalStandardsforallelectrical,electronicandrelatedtechnologies.AboutIECpublicationsThetechnicalcontentofIECpublicationsiskeptunderconstantreviewbytheIEC.Pleasemakesurethatyouhavethelatestedition,acorrigendumoranamendmentmighthavebeenpublished.IECpublicationssearch-webstore.iec.ch/advsearchformTheadvancedsearchenablestofindIECpublicationsbyavarietyofcriteria(referencenumber,text,technicalcommittee,…).Italsogivesinformationonprojects,replacedandwithdrawnpublications.IECJustPublished-webstore.iec.ch/justpublishedStayuptodateonallnewIECpublications.JustPublisheddetailsallnewpublicationsreleased.Availableonlineandonceamonthbyemail.IECCustomerServiceCentre-webstore.iec.ch/cscIfyouwishtogiveusyourfeedbackonthispublicationorneedfurtherassistance,pleasecontacttheCustomerServiceCentre:sales@iec.ch.Electropedia-www.electropedia.orgTheworld'sleadingonlinedictionaryonelectrotechnology,containingmorethan22000terminologicalentriesinEnglishandFrench,withequivalenttermsin16additionallanguages.AlsoknownastheInternationalElectrotechnicalVocab...
