IEC_61508_Part_7_Overview_of_Techniques__Measures_1.pdf

BRITISH STANDARD Functional safety of electrical/electronic/programmable electronic safety-related systems Part 7:Overview of techniques and measures The European Standard EN 61508-7:2001 has the status ofa British Standard ICs 25.040.40;29.020 BS EN 61508-712002 Incorporating Amendment No.I to(renumbers the BS IEC as BS IEC 6I 508-7:2000 BS EN 61508-7:2002)Copyright British Standards Institution Provided by IHS under license with BSINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 61 508-712002 Amd.No.National foreword Date Comments This British Standard is the official English language version of EN 61508-7:2001.It is identical with IEC 61508-7:2000.The UKparticipation in its preparation was entrusted to Technical Committee GEL/65,Measurement and control,to Subcommittee GEL/65/1,System considerations,which has the responsibility to:-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.-A list of organizations represented on this committee can be obtained on request to its secretary.Cr oss-r e fer enc e s The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled“International Standards Correspondence Index”,or by using the“Find”facility of the BSI Standards Electronic Catalogue.A British Standard does not purport to include all the necessary provisions of a contract.Users of British Standards are responsible for their correct application.Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pages This document comprises a front cover,an inside front cover,the EN title page,two EN foreword pages,a blank page,the IEC title page,pages 2 to 115,the annex ZA page,an inside back cover and a back cover.This British Standard,having been prepared under the direction of the Electrotechnical Sector Committee,was published The BSI copyright date displayed in this document indicates when the document was last issued.under the authority of the Standards Committee and comes into effect on 15 July 2000 O BSI 15 March 2002 13785 I15 March 2002 IIrnplementation of the European Standard ISBN O 580 36138 1 Copyright British Standards Institution Provided by IHS under license with BSINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EUROPEAN STANDARD EN 61508-7 NORME EUROPENNE EUROPISCHE NORM Decem ber 2001 ICs 25.040.40;35.240.50 English version Fu nct i on a I safety of elect ri cal/el ect ro n i c/p rog ram ma ble electron i c safety-re lated systems Part 7:Overview of techniques and measures(IEC 61 508-712000)Scurit fonctionnelle des systmes lectr iq u es/lectron iq u es/lectro n iq u es programmables relatifs la scurit Partie 7:Prsentation de techniques et mesu res(CE1 61508-712000)Verfahren und Manahmen Funktionale Sicherheit sicherheitsbezogener elektrischer/ele ktron ischer/program mierbarer elektronischer Systeme Teil 7:Anwendungshinweise ber(IEC 61508-712000)This European Standard was approved by CENELEC on 2001-07-03.CENELEC members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member.This European Standard exists in three official versions(English,French,German).A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions.CENELEC members are the national electrotechnical committees of Austria,Belgium,Czech Republic,Denmark,Finland,France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain,Sweden,Switzerland and United Kingdom.CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat:rue de Stassart 35,B-1050 Brussels O 2001 CENELEC-All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.Ref.No.EN 61508-7:2001 E Copyright British Standards Institution Provided by IHS under license with BSINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EN 61508-72001 Foreword The text of the International Standard IEC 61508-7:2000,prepared by SC 65A,System aspects,of IEC TC 65,Industrial-process measurement and control,was submitted to the Unique Acceptance Procedure and was approved by CENELEC as EN 61 508-7 on 200