IEC 62061:2005
(Main)Safety of machinery - Functional safety of safety-related electrical, electronic and programmable electronic control systems
Safety of machinery - Functional safety of safety-related electrical, electronic and programmable electronic control systems
specifies requirements and makes recommendations for the design, integration and validation of safety-related electrical, electronic and programmable electronic control systems (SRECS) for machines (see Notes 1 and 2). It is applicable to control systems used, either singly or in combination, to carry out safety-related control functions on machines that are not portable by hand while working, including a group of machines working together in a co-ordinated manner. The contents of the corrigenda of July 2005 and April 2008 have been included in this copy.
Sécurité des machines - Sécurité fonctionnelle des systèmes de commande électriques, électroniques et électroniques programmables relatifs à la sécurité
spécifie les exigences et donne des recommandations pour la conception, l'intégration et la validation des systèmes de commande électriques, électroniques et électroniques programmables relatifs à la sécurité (SRECS) pour les machines (voir Notes 1 et 2). Elle s'applique aux systèmes de commande utilisés, séparément ou en combinaison, pour assurer des fonctions de commande relatives à la sécurité de machines qui ne sont pas portables à la main en fonctionnement, y compris un groupe de machines fonctionnant ensemble d'une manière coordonnée. Le contenu des corrigenda de juillet 2005 et d'avril 2008 a été pris en considération dans cet exemplaire.
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IEC 62061 IEC 62061
Edition 1.2 2015-06 Édition 1.2 2015-06
Safety of machinery – Sécurité des machines –
Functional safety of safety-related electrical, Sécurité fonctionnelle des systèmes de
electronic and programmable electronic control commande électriques, él
...
IEC 62061
Edition 1.0 2005-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Safety of machinery – Functional safety of safety-related electrical, electronic
and programmable electronic control systems
Sécurité des machines – Sécurité fonctionnelle des systèmes de commande
électriques, électroniques et électroniques programmables relatifs à la sécurité
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by
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IEC 62061
Edition 1.0 2005-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Safety of machinery – Functional safety of safety-related electrical, electronic
and programmable electronic control systems
Sécurité des machines – Sécurité fonctionnelle des systèmes de commande
électriques, électroniques et électroniques programmables relatifs à la sécurité
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
XD
CODE PRIX
ICS 13.110; 25.040.99; 29.020 ISBN 2-8318-7818-7
– 2 – 62061 © IEC:2005
CONTENTS
FOREWORD.5
INTRODUCTION.7
1 Scope and object.10
2 Normative references .11
3 Terms, definitions and abbreviations .12
3.1 Alphabetical list of definitions .12
3.2 Terms and definitions .14
3.3 Abbreviations .22
4 Management of functional safety .23
4.1 Objective.23
4.2 Requirements.23
5 Requirements for the specification of Safety-Related Control Functions (SRCFs) .24
5.1 Objective.24
5.2 Specification of requirements for SRCFs .24
6 Design and integration of the safety-related electrical control system (SRECS) .27
6.1 Objective.27
6.2 General requirements.27
6.3 Requirements for behaviour (of the SRECS) on detection
of a fault in the SRECS .28
6.4 Requirements for systematic safety integrity of the SRECS .29
6.5 Selection of safety-related electrical control system .31
6.6 Safety-related electrical control system (SRECS) design and development .31
6.7 Realisation of subsystems .36
6.8 Realisation of diagnostic functions .52
6.9 Hardware implementation of the SRECS .53
6.10 Software safety requirements specification.53
6.11 Software design and development.54
6.12 Safety-related electrical control system integration and testing.62
6.13 SRECS installation .63
7 Information for use of the SRECS.63
7.1 Objective.63
7.2 Documentation for installation, use and maintenance .63
8 Validation of the safety-related electrical control system.64
8.1 General requirements.65
8.2 Validation of SRECS systematic safety integrity .65
9 Modification.66
9.1 Objective.66
9.2 Modification procedure .66
9.3 Configuration management procedures .67
10 Documentation .69
62061 © IEC:2005 – 3 –
Annex A (informative) SIL assignment .71
Annex B (informative) Example of safety-related electrical control system (SRECS)
design using concepts and requirements of Clauses 5 and 6 .79
Annex C (informative) Guide to embedded software design and development.86
Annex D (informative) Failure modes of electrical/electronic components .95
Annex E (informative) Electromagnetic (EM) phenomenon and increased immunity
levels for SRECS intended for use in an industrial environment according to
IEC 61000-6-2 .100
Annex F (informative) Methodology for the estimation of susceptibility to common
cause failures (CCF).102
Figure 1 – Relationship of IEC 62061 to other relevant standards .8
Figure 2 – Workflow of the SRECS design and development process .33
Figure 3 – Allocation of safety requirements of the function blocks to subsystems
(see 6.6.2.1.1) .34
Figure 4 – Workflow for subsystem design and development (see box 6B of Figure 2) .39
Figure 5 – Decomposition of a function block into redundant function block elements
and their associated subsystem elements .40
Figure 6 – Subsystem A logical representation .46
Figure 7 – Subsystem B logical representation .47
Figure 8 – Subsystem C logical representation .47
Figure 9 – Subsystem D logical representation .49
Figure A.1 – Workflow of SIL assignment process.72
Figure A.2 – Parameters used in risk estimation .73
Figure A.3 – Example proforma for SIL assignment process .78
Figure B.1 – Terminology used in functional decomposition .79
Figure B.2 – Example machine .80
Figure B.3 – Specification of requirements for an SRCF .80
Figure B.4 – Decomposition to a structure of function blocks .81
Figure B.5 – Initial concept of an architecture for a SRECS .82
Figure B.6 – SRECS architecture with diagnostic functions embedded within each
subsystem (SS1 to SS4) .83
Figure B.7 – SRECS architecture with diagnostic functions embedded within
subsystem SS3.84
Figure B.8 – Estimation of PFH for a SRECS.85
D
Table 1 – Recommended application of IEC 62061 and ISO 13849-1(under revision) .9
Table 2 – Overview and objectives of IEC 62061 .11
Table 3 – Safety integrity levels: target failure values for SRCFs .26
Table 4 – Characteristics of subsystems 1 and 2 used in this example.36
Table 5 – Architectural constraints on subsystems: maximum SIL that can be claimed
for a SRCF using this subsystem .42
Table 6 – Architectural constraints: SILCL relating to categories.43
Table 7 – Probability of dangerous failure .45
Table 8 – Information and documentation of a SRECS.
...
IEC 62061 ®
Edition 1.1 2012-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Safety of machinery – Functional safety of safety-related electrical, electronic
and programmable electronic control systems
Sécurité des machines – Sécurité fonctionnelle des systèmes de commande
électriques, électroniques et électroniques programmables relatifs à la sécurité
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,
please contact the address below or your local IEC member National Committee for further information.
Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni
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microfilms, sans l'accord écrit de la CEI ou du Comité national de la CEI du pays du demandeur.
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publication, utilisez les coordonnées ci-après ou contactez le Comité national de la CEI de votre pays de résidence.
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Switzerland 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.
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Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.
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IEC 62061 ®
Edition 1.1 2012-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Safety of machinery – Functional safety of safety-related electrical, electronic
and programmable electronic control systems
Sécurité des machines – Sécurité fonctionnelle des systèmes de commande
électriques, électroniques et électroniques programmables relatifs à la sécurité
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.110; 25.040.99; 29.020 ISBN 978-2-8322-0487-0
– 2 – 62061 IEC:2005+A1:2012
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope and object . 10
2 Normative references . 11
3 Terms, definitions and abbreviations . 12
3.1 Alphabetical list of definitions . 12
3.2 Terms and definitions . 14
3.3 Abbreviations . 22
4 Management of functional safety . 22
4.1 Objective . 22
4.2 Requirements . 22
5 Requirements for the specification of Safety-Related Control Functions (SRCFs) . 24
5.1 Objective . 24
5.2 Specification of requirements for SRCFs . 24
6 Design and integration of the safety-related electrical control system (SRECS) . 26
6.1 Objective . 26
6.2 General requirements . 26
6.3 Requirements for behaviour (of the SRECS) on detection
of a fault in the SRECS . 27
6.4 Requirements for systematic safety integrity of the SRECS . 28
6.5 Selection of safety-related electrical control system . 30
6.6 Safety-related electrical control system (SRECS) design and development . 30
6.7 Realisation of subsystems . 35
6.8 Realisation of diagnostic functions . 51
6.9 Hardware implementation of the SRECS . 52
6.10 Software safety requirements specification . 52
6.11 Software design and development . 53
6.12 Safety-related electrical control system integration and testing . 60
6.13 SRECS installation . 62
7 Information for use of the SRECS . 62
7.1 Objective . 62
7.2 Documentation for installation, use and maintenance . 62
8 Validation of the safety-related electrical control system . 63
8.1 Objective . 63
8.2 General requirements . 63
8.3 Validation of SRECS systematic safety integrity . 64
9 Modification . 65
9.1 Objective . 65
9.2 Modification procedure . 65
9.3 Configuration management procedures . 65
10 Documentation . 67
62061 IEC:2005+A1:2012 – 3 –
Annex A (informative) SIL assignment . 69
Annex B (informative) Example of safety-related electrical control system (SRECS)
design using concepts and requirements of Clauses 5 and 6 . 77
Annex C (informative) Guide to embedded software design and development . 84
Annex D (informative) Failure modes of electrical/electronic components . 92
Annex E (informative) Electromagnetic (EM) phenomenon and increased immunity
levels for SRECS intended for use in an industrial environment according to
IEC 61000-6-2 . 97
Annex F (informative) Methodology for the estimation of susceptibility to common
cause failures (CCF) . 99
Figure 1 – Relationship of IEC 62061 to other relevant standards . 8
Figure 2 – Workflow of the SRECS design and development process . 32
Figure 3 – Allocation of safety requirements of the function blocks to subsystems
(see 6.6.2.1.1) . 33
Figure 4 – Workflow for subsystem design and development (see box 6B of Figure 2) . 38
Figure 5 – Decomposition of a function block into redundant function block elements
and their associated subsystem elements . 39
Figure 6 – Subsystem A logical representation . 45
Figure 7 – Subsystem B logical representation . 46
Figure 8 – Subsystem C logical representation . 46
Figure 9 – Subsystem D logical representation . 48
Figure A.1 – Workflow of SIL assignment process . 70
Figure A.2 – Parameters used in risk estimation . 71
Figure A.3 – Example proforma for SIL assignment process . 78
Figure B.1 – Terminology used in functional decomposition . 77
Figure B.2 – Example machine . 78
Figure B.3 – Specification of requirements for an SRCF . 78
Figure B.4 – Decomposition to a structure of function blocks . 79
Figure B.5 – Initial concept of an architecture for a SRECS . 80
Figure B.6 – SRECS architecture with diagnostic functions embedded within each
subsystem (SS1 to SS4) . 81
Figure B.7 – SRECS architecture with diagnostic functions embedded within
subsystem SS3 . 82
Figure B.8 – Estimation of PFH for a SRECS. 83
D
Table 1 – Recommended application of IEC 62061 and ISO 13849-1(under revision) . 9
Table 2 – Overview and objectives of IEC 62061 . 11
Table 3 – Safety integrity levels: target failure values for
...
IEC 62061 ®
Edition 1.2 2015-06
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Safety of machinery – Functional safety of safety-related electrical, electronic
and programmable electronic control systems
Sécurité des machines – Sécurité fonctionnelle des systèmes de commande
électriques, électroniques et électroniques programmables relatifs à la sécurité
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, please contact the address below or
your local IEC member National Committee for further information.
Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé Fax: +41 22 919 03 00
CH-1211 Geneva 20 info@iec.ch
Switzerland 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.
IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
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bibliographical information on IEC International Standards, electrical terms containing more than 30 000 terms and
Technical Specifications, Technical Reports and other definitions in English and French, with equivalent terms in 15
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iPad. Electrotechnical Vocabulary (IEV) online.
IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a More than 60 000 electrotechnical terminology entries in
variety of criteria (reference number, text, technical English and French extracted from the Terms and Definitions
committee,…). It also gives information on projects, replaced clause of IEC publications issued since 2002. Some entries
and withdrawn publications. have been collected from earlier publications of IEC TC 37,
77, 86 and CISPR.
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also once a month by email. need further assistance, please contact the Customer Service
Centre: csc@iec.ch.
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.
A propos des publications IEC
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IEC 62061 ®
Edition 1.2 2015-06
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Safety of machinery – Functional safety of safety-related electrical, electronic
and programmable electronic control systems
Sécurité des machines – Sécurité fonctionnelle des systèmes de commande
électriques, électroniques et électroniques programmables relatifs à la sécurité
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.110; 25.040.99; 29.020 ISBN 978-2-8322-2774-9
IEC 62061 ®
Edition 1.2 2015-06
CONSOLIDATED VERSION
REDLINE VERSION
VERSION REDLINE
colour
inside
Safety of machinery – Functional safety of safety-related electrical, electronic
and programmable electronic control systems
Sécurité des machines – Sécurité fonctionnelle des systèmes de commande
électriques, électroniques et électroniques programmables relatifs à la sécurité
– 2 – IEC 62061:2005
+AMD1:2012+AMD2:2015 CSV IEC 2015
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 10
2 Normative references . 11
3 Terms, definitions and abbreviations . 12
3.1 Alphabetical list of definitions . 12
3.2 Terms and definitions . 14
3.3 Abbreviations . 22
4 Management of functional safety . 22
4.1 Objective . 22
4.2 Requirements . 22
5 Requirements for the specification of Safety-Related Control Functions (SRCFs) . 23
5.1 Objective . 23
5.2 Specification of requirements for SRCFs . 24
6 Design and integration of the safety-related electrical control system (SRECS) . 26
6.1 Objective . 26
6.2 General requirements . 26
6.3 Requirements for behaviour (of the SRECS) on detection of a fault in the
SRECS . 27
6.4 Requirements for systematic safety integrity of the SRECS . 27
6.5 Selection of safety-related electrical control system . 29
6.6 Safety-related electrical control system (SRECS) design and development . 29
6.7 Realisation of subsystems . 35
6.8 Realisation of diagnostic functions . 50
6.9 Hardware implementation of the SRECS . 52
6.10 Software safety requirements specification . 52
6.11 Software design and development . 53
6.12 Safety-related electrical control system integration and testing . 59
6.13 SRECS installation . 61
7 Information for use of the SRECS . 61
7.1 Objective . 61
7.2 Documentation for installation, use and maintenance . 61
8 Validation of the safety-related electrical control system . 62
8.1 Objective . 62
8.2 General requirements . 62
8.3 Validation of SRECS systematic safety integrity . 62
9 Modification . 63
9.1 Objective . 63
9.2 Modification procedure . 64
9.3 Configuration management procedures . 64
10 Documentation . 66
+AMD1:2012+AMD2:2015 CSV IEC 2015
Annex A (informative) SIL assignment . 68
Annex B (informative) Example of safety-related electrical control system (SRECS)
design using concepts and requirements of Clauses 5 and 6 . 76
Annex C (informative) Guide to embedded software design and development . 83
Annex D (informative) Failure modes of electrical/electronic components .
Annex E (informative) Electromagnetic (EM) phenomenon and increased immunity
levels for SRECS intended for use in an industrial environment according to
IEC 61000-6-2 .
Annex F (informative) Methodology for the estimation of susceptibility to common
cause failures (CCF) . 98
Figure 1 – Relationship of IEC 62061 to other relevant standards . 8
Figure 2 – Workflow of the SRECS design and development process . 32
Figure 3 – Allocation of safety requirements of the function blocks to subsystems
(see 6.6.2.1.1) . 33
Figure 4 – Workflow for subsystem design and development (see box 6B of Figure 2) . 38
Figure 5 – Decomposition of a function block into redundant function block elements
and their associated subsystem elements . 39
Figure 6 – Subsystem A logical representation . 45
Figure 7 – Subsystem B logical representation . 46
Figure 8 – Subsystem C logical representation . 46
Figure 9 – Subsystem D logical representation .
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