ISO INTERNATIONAL STANDARD 13849-2 Secondedition 2012-10-15 Safety of machinery Safety-related parts of control systems - Part 2: Validation Sécurité des machines - Parties des systemes de commande relatives alasécurité- Partie 2: Validation Reference number ISO 13849-2:2012(E) ISO Copyriaht intemational Organizatinfor Standardizatin @IS02012 HS under I Not for Resale IS0 13849-2:2012(E) COPYRIGHT PROTECTED DOCUMENT ISO2012 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 IsO at the addressbeloworIso'smemberbodyinthecountryoftherequester. ISO copyright office Case postale 56 : CH-1211 Geneva 20 Tel.+41227490111 Fax + 41 22 749 09 47 E-mail [email protected] web www.iso.org Published in Switzerland @ IS0 2012 - All rights reserved Not for Resale IS0 13849-2:2012(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references 3 Terms and definitions ..1 4 Validation process ..1 4.1 Validation principles 4.2 Validation plan .3 4.3 Generic fault lists .4 4.4 Specific fault lists .4 4.5 Information for validation 4 4.6 Validation record .6 5 Validation by analysis .6 5.1 General .6 5.2 Analysis techniques .7 6 Validation by testing 6.1 General. 7 6.2 Measurement accuracy ..8 6.3 More stringent requirements ..8 6.4 Number of test samples .8 7 Validation of safety requirements specification for safety functions ..9 8 Validation of safety functions. ...9 9 Validation of performance levels and categories .10 9.1 Analysis and testing . ..10 9.2 Validation of category specifications ..10 9.3 Validation of MTTFa, DCavg and CCF. ..12 9.4 Validation of measures against systematic failures related to performance level and category of SRP/CS. 13 9.5 Validation of safety-related software. .13 9.6 Validation and verification of performance level. ..14 9.7 Validation of combination of safety-related parts ..14 10 Validation of environmental requirements. ..15 11 Validation of maintenance requirements .15 12 Validation oftechnical documentation and information for use ..16 Annex A (informative) Validation tools for mechanical systems ..17 Annex B (informative) Validation toolsfor pneumatic systems ..21 Annex C (informative) Validation tools for hydraulic systems ..31 Annex D (informative) Validation tools for electrical systems ..40 Annex E (informative) Example of validation of fault behaviour and diagnostic means ..53 Bibliography ..78 iii se with IS ed without license from IHS Not for Resale IS0 13849-2:2012(E) Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through IsO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with IsO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISo/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies castingavote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. IsO shall not be held responsible for identifying any or all such patent rights. IS0 13849-2 was prepared by Technical Committee IS0/TC 199, Safety of machinery This second edition