IEC_61511-2-2003.pdf

INTERNATIONALIECSTANDARD61511-2First edition2003-07Functional safetySafety instrumented systemsfor the process industry sector-Part 2:Guidelines for the application of IEC 61511-1IECReference number1EC61511-2:2003(E)Copyright by the International Electrotechnical CommissionPublication numberingAs from 1 January 1997 all IEC publications are issued with a designation in the60000 series.For example,IEC 34-1 is now referred to as IEC 60034-1.Consolidated editionsThe IEC is now publishing consolidated versions of its publications.For exampleedition numbers 1.0,1.1 and 1.2 refer,respectively,to the base publication,thebase publication incorporating amendment 1 and the base publication incorporatingamendments 1 and 2.Further information on IEC publicationsThe technical content of IEC publications is kept under constant review by the IEC,thus ensuring that the content reflects current technology.Information relating tothis publication,including its validity,is available in the IEC Catalogue ofpublications(see below)in addition to new editions,amendments and corrigenda.Information on the subjects under consideration and work in progress undertakenby the technical committee which has prepared this publication,as well as the listof publications issued,is also available from the following:IEC Web Site(www.lec.ch)Catalogue of IEC publicationsThe on-line catalogue on the IEC web site(www.iec.chsearchpub)enables you tosearch by a variety of criteria including text searches,technical committeesand date of publication.On-line information is also available on recently issuedpublications,withdrawn and replaced publications,as well as corrigendaIEC Just PublishedThis summary of recently issued publications(www.iec.ch/online news/_justpub)is also available by email.Please contact the Customer Service Centre(seebelow)for further information.Customer Service CentreIf you have any questions regarding this publication or need further assistance.please contact the Customer Service Centre:Email:custserviec.chTe:+41229190211Fax:+41229190300INTERNATIONALIECSTANDARD61511-2First edition2003-07Functional safetySafety instrumented systemsfor the process industry sectorPart 2:Guidelines for the application of IEC 61511-1IEC 2003-Copyright-all rights reservedIntemational Electrotechnical Commission,3.rue de Varembe,PO Box 131.CH-1211 Geneva 20,SwitzerlandTelephone:+41 22 919 02 11 Telefax:+41 22 919 03 00 E-mail:inmailiec.ch Web:www.iec.chPRICE CODE XBrotechnical CommissonFor price,cn ctalogu61511-21EC:2003(E)-3-12.5 Integration of the application software with the SIS subsystem.4912.6 FPL and LVL software modification procedures.4912.7 Application software verification.5013 Factory acceptance testing(FAT).5113.10 bjectives5113.2 Recommendations.。.5114 SIS installation and commissioning.5214.10 bjectives5214.2 Requirements.5215 SIS safety validation.5215.10 bjective.5215.2 Requirements.5216 SIS operation and maintenance.5316.1 Objectives.5316.2 Requirements.5316.3 Proof testing and inspection.5317 81S modification.5517.1.5517.2 Requirements5518 SlS decommissioning.5518.1 0bjgctivgs5518.2 Requirements.5519 Information and documentation requirements.5518.1 0bjectives5518.2 Requiremonts.55Annex A(informative)Example of techniques for calculating the probability of failureon demand for a safety instrumented function.57Annex B(informative)Typical sIs architecture development.8Annex C(informative)Application features of a safety PLC.63Annex D(informative)Example of SIS logic solver application software developmentmethodology65Annex E(informative)Example of development of externally configured diagnosticsfor a safety-configured PE logic solver.69Figure 1-Overall framework of this standard.Figure 2-BPCS function and initiating cause independence illustration.21Figure 3-Software development lifecycle(the V-model).38Figure C.1-Logic solver.64Figure E.1-EWDT timing diagram.71Table 1-Typical Safety Manual organisation and contents.4