IEC S+IEC61508 Edition 2.02010-04 IEC STANDARDS+ COMMENTEDVERSION Functional safetyofelectrical/electronic/programmableelectronic safety-related systems - Part 1: General requirements Part 2: Requirements for electrical/electronic/programmable electronic safety-related systems Part 3: Software requirements Part 4: Definitions and abbreviations Part 5: Examples of methods for the determination of safety integrity levels Part 6: Guidelines on the application of IEC 61508-2 and IEC 61508-3 Part 7: Overview of techniques and measures S+ IEC 61508:2010(E) standard99g THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright @ 2010 IEC, Geneva, Switzerland All rights reserved.Unless otherwise specified, 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 either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication, IEC Central Office 3,rue de Varembé CH-1211 Geneva 20 Switzerland Email: [email protected] Web:www.iec.ch About the IEC The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes International Standards for all electrical, electronic and related technologies. About IEC publications The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the latest edition, a corrigenda or an amendment might have been published. : Catalogue of IEC publications: www.iec.ch/searchpub The IEC on-line Catalogue enables you to search by a variety of criteria (reference number, text, technical committee,...). It also gives information on projects, withdrawn and replaced publications. - IEC Just Published: www.iec.ch/online news/iustpub Stay up to date on all new IEC publications. Just Published details twice a month all new publications released. Available on-line and also by email. . Electropedia: www.electropedia.org The world's leading online dictionary of electronic and electrical terms containing more than 20 ooo terms and definitions in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical Vocabulary online. Customer Service Centre: www.iec.ch/webstore/custserv If you wish to give us your feedback on this publication or need further assistance, please visit the Customer Service Centre FAQ or contact us: Email: [email protected] Tel.: +41 22 919 02 211 Fax:+41229190300 standard999 IEC S+IEC61508 Edition 2.0 2010-04 IEC STANDARDS+ COMMENTEDVERSION Functional safetyof electrical/electronic/programmableelectronic safety-relatedsystems- Part 1:General requirements Part 2: Requirements for electrical/electronic/programmable electronic safety-related systems Part3:Softwarerequirements Part 4: Definitions and abbreviations Part 5: Examples of methods for the determination of safety integrity levels Part 6: Guidelines on the application of IEC 61508-2 and IEC 61508-3 Part 7: Overview of techniques and measures INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 13.110; 25.040; 29.020 ISBN 978-2-88910-985-2 ?Registered traden standard99c - 2 - 61508-1@IEC:2010 INTERNATIONAL ELECTROTECHNICAL COMMISSION FUNCTIONALSAFETYOFELECTRICAL/ELECTRONICI PROGRAMMABLEELECTRONICSAFETY-RELATEDSYSTEMS Part 1: General requirements FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising national electrotechnical committees(IECNational Committees). The object ofIEC istopromote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEc publishes International Standards, Technical Specifications, Technical Reports PubliclyAvailableSpecifications (PAS)andGuides(hereafter Publication(s)")