IEC_61511-1_2003_-_Safety_Instrumented_Systems.pdf

BRITISH STANDARDBS IEC 61511-1:2003Functional safety Safety instrumented systems for the process industry sector Part 1:Framework,definitions,system,hardware and software requirementsICS 25.040.01;13.110?COPYRIGHT 2003;British Standards Institution on ERC Specs and Standards Document provided by IHS Licensee=Agip KOC/5950653001,User=,06/18/200307:16:48 MDT Questions or comments about this message:please call the DocumentPolicy Management Group at 1-800-451-1584.-,-,-BS IEC 61511-1:2003This British Standard was published under the authority of the Standards Policy and Strategy Committee on 12 March 2003 BSI 12 March 2003ISBN 0 580 41386 1National forewordThis British Standard reproduces verbatim IEC 61511-1:2003 and implements it as the UK national standard.The UK participation in its preparation was entrusted by Technical Committee GEL/65,Measurement and control,to Subcommittee GEL/65/1,System considerations,which has the responsibility to:A list of organizations represented on this subcommittee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled“International Standards Correspondence Index”,or by using the“Search”facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract.Users are responsible for its correct application.Compliance with a British Standard does not of itself confer immunity from legal obligations.aid enquirers to understand the text;present to the responsible international/European committee any enquiries on the interpretation,or proposals for change,and keep the UK interests informed;monitor related international and European developments and promulgate them in the UK.Summary of pagesThis document comprises a front cover,an inside front cover,the IEC title page,pages 2 to 84,an inside back cover and a back cover.The BSI copyright date displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd.No.DateCommentsCOPYRIGHT 2003;British Standards Institution on ERC Specs and Standards Document provided by IHS Licensee=Agip KOC/5950653001,User=,06/18/200307:16:48 MDT Questions or comments about this message:please call the DocumentPolicy Management Group at 1-800-451-1584.-,-,-INTERNATIONALSTANDARDIEC61511-1First edition2003-01Functional safety Safety instrumented systemsfor the process industry sector Part 1:Framework,definitions,system,hardware and software requirementsScurit fonctionnelle Systmes instruments de scurit pour le secteurdes industries de transformation Partie 1:Cadre,dfinitions et prescriptions concernantle systme,le matriel et le logicielReference numberIEC 61511-1:2003(E)BS IEC 615111:2003COPYRIGHT 2003;British Standards Institution on ERC Specs and Standards Document provided by IHS Licensee=Agip KOC/5950653001,User=,06/18/200307:16:48 MDT Questions or comments about this message:please call the DocumentPolicy Management Group at 1-800-451-1584.-,-,-CONTENTSFOREWORD.5INTRODUCTION.71Scope.92Normative references.143Abbreviations and definitions.153.1Abbreviations.153.2Definitions.164Conformance to this International Standard.305Management of functional safety.305.1Objective.305.2Requirements.306Safety life-cycle requirements.356.1 Objectives.356.2Requirements.357Verification.377.1Objective.378 Process hazard and risk assessment.388.1Objectives.388.2Requirements.389Allocation of safety functions to protection layers.399.1Objective.399.2Requirements of the allocation process.399.3Additional requirements for safety integrity level 4.409.4Requirements on the basic process control system as a protection layer.419.5Requirements for preventing common cause,common mode and dependentfailures.4210SIS safety requirements specification.4310.1 Objective.4310.2 General requirements.4310.3 SIS safety requirements.4311SIS design and engineering.4411.1 Objective.4411.2 General requirements.4411.3 Requirements for system behaviour on detection of a fault.4611.4 Requirements for hardware fault tolerance.4711.5 Requirements for selection of components and subsystems.4811.6 Field devices.5111.7 Interfaces.5211.8 Maintenance or testing design requirements.5411.9 SIF probability of failure.54BS IEC 615111:20032COPYRIGHT 2003;British Standards Institution on ERC Specs and Standards Document provided by IHS Licensee=Agip KOC/5950653001,User=,06/18/200307:16:48 MDT Questions or comments about this message:please call the DocumentPolicy Management Group at 1-800-451-1584.-,-,-12Requirements for application software,including selection criteria for utility software.5512.1 Application software safety life-cycle requirements.5612.2 Application software safety requirements specification.6212.3 Application software safety validation planning.6412.4 Application software design and development.6412.5 Integ