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1 Nederlandse norm Functional safety - Safety instrumented systems for the process industry sector - Part 1: Framework, definitions, system, hardware and software requirements (IEC :2003,IDT, IEC :2003/C1:2004,IDT) NEN-EN-IEC (en) januari 2005 ICS ; Vervangt NEN-IEC :2003 Dit document mag slechts op een stand-alone PC worden geinstalleerd. Gebruik op een netwerk is alleen. toestaan als een aanvullende licentieovereenkomst voor netwerkgebruik met NEN is afgesloten. This document may only be used on a stand-alone PC. Use in a network is only permitted when a supplementary license agreement for us in a network with NEN has been concluded. Als Nederlandse norm is aanvaard: - EN :2004,IDT - IEC :2003,IDT; IEC :2003/C1:2004,IDT Nederlands Elektrotechnisch Comité (NEC) Normcommissie Industriele meet"en regeltechniek (NEC 65)" Apart from exceptions provided by the law, nothing from this publication may be duplicated and/or published by means of photocopy, microfilm, storage in computer files or otherwise, which also applies to full or partial processing, without the written consent of the Netherlands Standardization Institute. The Netherlands Standardization Institute shall, with the exclusion of any other beneficiary, collect payments owed by third parties for duplication and/or act in and out of law, where this authority is not transferred or falls by right to the Reproduction Rights Foundation. Auteursrecht voorbehouden. Behoudens uitzondering door de wet gesteld mag zonder schriftelijke toestemming van het Nederlands Normalisatie-instituut niets uit deze uitgave worden verveelvoudigd en/of openbaar gemaakt door middel van fotokopie, microfilm, opslag in computerbestanden of anderszins, hetgeen ook van toepassing is op gehele of gedeeltelijke bewerking. Het Nederlands Normalisatie-instituut is met uitsluiting van ieder ander gerechtigd de door derden verschuldigde vergoedingen voor verveelvoudiging te innen en/of daartoe in en buiten rechte op te treden, voor zover deze bevoegdheid niet is overgedragen c.q. rechtens toekomt aan de Stichting Reprorecht. Although the utmost care has been taken with this publication, errors and omissions cannot be entirely excluded. The Netherlands Standardization Institute and/or the members of the committees therefore accept no liability, not even for direct or indirect damage, occurring due to or in relation with the application of publications issued by the Netherlands Standardization Institute. Hoewel bij deze uitgave de uiterste zorg is nagestreefd, kunnen fouten en onvolledigheden niet geheel worden uitgesloten. Het Nederlands Normalisatie-instituut en/of de leden van de commissies aanvaarden derhalve geen enkele aansprakelijkheid, ook niet voor directe of indirecte schade, ontstaan door of verband houdend met toepassing van door het Nederlands Normalisatie-instituut gepubliceerde uitgaven Nederlands Normalisatie-instituut Postbus 5059, 2600 GB Delft Telefoon (015) , Fax (015)

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3 EUROPEAN STANDARD EN NORME EUROPÉENNE EUROPÄISCHE NORM December 2004 ICS ; English version Functional safety Safety instrumented systems for the process industry sector Part 1: Framework, definitions, system, hardware and software requirements (IEC : corrigendum 2004) Sécurité fonctionnelle Systèmes instrumentés de sécurité pour le secteur des industries de transformation Partie 1: Cadre, définitions, exigences pour le système, le matériel et le logiciel (CEI : corrigendum 2004) Funktionale Sicherheit - Sicherheitstechnische Systeme für die Prozessindustrie Teil 1: Allgemeines, Begriffe, Anforderungen an Systeme, Software und Hardware (IEC : Corrigendum 2004) This European Standard was approved by CENELEC on CENELEC members are bound to comply with the CEN/CENELEC 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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B Brussels 2004 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN :2004 E

4 EN : Foreword The text of the International Standard IEC :2003, 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 on without any modification. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) latest date by which the national standards conflicting with the EN have to be withdrawn (dow) Annex ZA has been added by CENELEC. Endorsement notice The text of the International Standard IEC : corrigendum November 2004 was approved by CENELEC as a European Standard without any modification.

5 - 3 - EN :2004 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NOTE Where an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Ti tle EN/HD Year IEC Industrial-process measurement and control equipment - Operating conditions Part 1: Climatic conditions EN IEC Part 3: Mechanical influences EN IEC ) Electrical equipment for measurement, control and laboratory use - EMC requirements IEC ) Functional safety of electrical/electronic/programmable electronic safety-related systems Part 2: Requirements for electrical/electronic/programmable electronic safety-related systems EN ) EN ) IEC ) Part 3: Software requirements EN ) IEC ) Functional safety - Safety instrumented systems for the process industry sector Part 2: Guidelines for the application of IEC EN ) 1) Undated reference. 2) Valid edition at date of issue.

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7 NEN-EN-IEC :2005 en INTERNATIONAL STANDARD IEC First edition Functional safety Safety instrumented systems for the process industry sector Part 1: Framework, definitions, system, hardware and software requirements Sécurité fonctionnelle Systèmes instrumentés de sécurité pour le secteur des industries de transformation Partie 1: Cadre, définitions et prescriptions concernant le système, le matériel et le logiciel Reference number IEC :2003(E)

8 NEN-EN-IEC :2005 en Publication numbering As from 1 January 1997 all IEC publications are issued with a designation in the series. For example, IEC 34-1 is now referred to as IEC Consolidated editions The IEC is now publishing consolidated versions of its publications. For example, edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the base publication, the base publication incorporating amendment 1 and the base publication incorporating amendments 1 and 2. Further information on IEC publications The technical content of IEC publications is kept under constant review by the IEC, thus ensuring that the content reflects current technology. Information relating to this publication, including its validity, is available in the IEC Catalogue of publications (see below) in addition to new editions, amendments and corrigenda. Information on the subjects under consideration and work in progress undertaken by the technical committee which has prepared this publication, as well as the list of publications issued, is also available from the following: IEC Web Site ( Catalogue of IEC publications The on-line catalogue on the IEC web site ( enables you to search by a variety of criteria including text searches, technical committees and date of publication. On-line information is also available on recently issued publications, withdrawn and replaced publications, as well as corrigenda. IEC Just Published This summary of recently issued publications ( justpub/jp_entry.htm) is also available by . Please contact the Customer Service Centre (see below) for further information. Customer Service Centre If you have any questions regarding this publication or need further assistance, please contact the Customer Service Centre: custserv@iec.ch Tel: Fax:

9 NEN-EN-IEC :2005 en INTERNATIONAL STANDARD IEC First edition Functional safety Safety instrumented systems for the process industry sector Part 1: Framework, definitions, system, hardware and software requirements Sécurité fonctionnelle Systèmes instrumentés de sécurité pour le secteur des industries de transformation Partie 1: Cadre, définitions et prescriptions concernant le système, le matériel et le logiciel IEC 2003 Copyright - all rights reserved No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland Telephone: Telefax: inmail@iec.ch Web: Commission Electrotechnique Internationale International Electrotechnical Commission PRICE CODE For price, see current catalogue X

10 NEN-EN-IEC :2005 en IEC:2003(E) CONTENTS FOREWORD... 5 INTRODUCTION Scope Normative references Abbreviations and definitions Abbreviations Definitions Conformance to this International Standard Management of functional safety Objective Requirements Safety life-cycle requirements Objective Requirements Verification Objective Process hazard and risk analysis Objectives Requirements Allocation of safety functions to protection layers Objective Requirements of the allocation process Additional requirements for safety integrity level Requirements on the basic process control system as a protection layer Requirements for preventing common cause, common mode and dependent failures SIS safety requirements specification Objective General requirements SIS safety requirements SIS design and engineering Objective General requirements Requirements for system behaviour on detection of a fault Requirements for hardware fault tolerance Requirements for selection of components and subsystems Field devices Interfaces Maintenance or testing design requirements SIF probability of failure...54

11 NEN-EN-IEC :2005 en IEC:2003(E) 3 12 Requirements for application software, including selection criteria for utility software Application software safety life-cycle requirements Application software safety requirements specification Application software safety validation planning Application software design and development Integration of the application software with the SIS subsystem FPL and LVL software modification procedures Application software verification Factory acceptance testing (FAT) Objectives Recommendations SIS installation and commissioning Objectives Requirements SIS safety validation Objective Requirements SIS operation and maintenance Objectives Requirements Proof testing and inspection SIS modification Objective Requirements SIS decommissioning Objectives Requirements Information and documentation requirements Objectives Requirements...81 Annex A (informative) Differences...83 Figure 1 Overall framework of this standard... 8 Figure 2 Relationship between IEC and IEC Figure 3 Relationship between IEC and IEC (see 1.2)...12 Figure 4 Relationship between safety instrumented functions and other functions...13 Figure 5 Relationship between system, hardware, and software of IEC Figure 6 Programmable electronic system (PES): structure and terminology...23 Figure 7 Example SIS architecture...26 Figure 8 SIS safety life-cycle phases and functional safety assessment stages...33 Figure 9 Typical risk reduction methods found in process plants...42 Figure 10 Application software safety life cycle and its relationship to the SIS safety life cycle...56

12 NEN-EN-IEC :2005 en IEC:2003(E) Figure 11 Application software safety life cycle (in realization phase)...58 Figure 12 Software development life cycle (the V-model)...59 Figure 13 Relationship between the hardware and software architectures of SIS...62 Table 1 Abbreviations used in IEC Table 2 SIS safety life-cycle overview...36 Table 3 Safety integrity levels: probability of failure on demand...40 Table 4 Safety integrity levels: frequency of dangerous failures of the SIF...40 Table 5 Minimum hardware fault tolerance of PE logic solvers...47 Table 6 Minimum hardware fault tolerance of sensors and final elements and non-pe logic solvers...48 Table 7 Application software safety life cycle: overview...60

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