IEC 61511-1:2016
(Main)Functional safety - Safety instrumented systems for the process industry sector - Part 1: Framework, definitions, system, hardware and application programming requirements
Functional safety - Safety instrumented systems for the process industry sector - Part 1: Framework, definitions, system, hardware and application programming requirements
IEC 61511-1:2016 is available as IEC 61511-1:2016 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 61511-1:2016 gives requirements for the specification, design, installation, operation and maintenance of a safety instrumented system (SIS), so that it can be confidently entrusted to achieve or maintain a safe state of the process. IEC 61511-1 has been developed as a process sector implementation of IEC 61508:2010. The contents of the corrigendum of September 2016 have been included in this copy.
Sécurité fonctionnelle - Systèmes instrumentés de sécurité pour le secteur des industries de transformation - Partie 1: Cadre, définitions, exigences pour le système, le matériel et la programmation d'application
L'IEC 61511-1:2016 décrit les exigences relatives à la spécification, la conception, l'installation, au fonctionnement et à la maintenance d'un système instrumenté de sécurité (SIS, Safety Instrumented System) de manière à ce qu'il puisse être mis en oeuvre en toute confiance pour établir ou maintenir le processus dans un état de sécurité convenable. L'IEC 61511-1 a été conçue pour être une mise en oeuvre de l'IEC 61508:2010 dans le secteur des industries de transformation. Le contenu du corrigendum de septembre 2016 a été pris en considération dans cet exemplaire.
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IEC 61511-1 ®
Edition 2.0 2016-02
REDLINE VERSION
INTERNATIONAL
STANDARD
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Functional safety – Safety instrumented systems for the process industry
sector –
Part 1: Framework, definitions, system, hardware and software application
programming requirements
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
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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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bibliographical information on IEC International Standards, electrical terms containing 20 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 15 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.
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variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
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and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and
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IEC 61511-1 ®
Edition 2.0 2016-02
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Functional safety – Safety instrumented systems for the process industry
sector –
Part 1: Framework, definitions, system, hardware and software application
programming requirements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 13.110; 25.040.01 ISBN 978-2-8322-3216-3
– 2 – IEC 61511-1:2016 RLV IEC 2016
CONTENTS
FOREWORD . 5
INTRODUCTION . 2
1 Scope . 9
2 Normative references. 14
3 Terms, definitions and abbreviations . 15
3.1 Terms . 15
3.2 Terms and definitions . 15
3.3 Abbreviations . 38
4 Conformance to the IEC 61511-1:2016 . 39
5 Management of functional safety . 39
5.1 Objective . 39
5.2 Requirements . 39
5.2.1 General . 39
5.2.2 Organization and resources . 39
5.2.3 Risk evaluation and risk management . 40
5.2.4 Safety planning . 40
5.2.5 Implementing and monitoring . 40
5.2.6 Assessment, auditing and revisions . 41
5.2.7 SIS configuration management . 44
6 Safety life-cycle requirements . 44
6.1 Objectives . 44
6.2 Requirements . 45
6.3 Application program SIS safety life-cycle requirements . 47
7 Verification . 50
7.1 Objective . 50
7.2 Requirements . 50
8 Process H&RA . 52
8.1 Objectives . 52
8.2 Requirements . 52
9 Allocation of safety functions to protection layers . 53
9.1 Objectives . 53
9.2 Requirements of the allocation process . 54
9.3 Additional requirements for safety integrity level 4 .
9.3 Requirements on the basic process control system as a protection layer . 56
9.4 Requirements for preventing common cause, common mode and dependent
failures . 58
10 SIS safety requirements specification (SRS) . 58
10.1 Objective . 58
10.2 General requirements . 58
10.3 SIS safety requirements . 58
11 SIS design and engineering . 60
11.1 Objective . 61
11.2 General requirements . 61
11.3 Requirements for system behaviour on detection of a fault . 63
11.4 Requirements for Hardware fault tolerance . 63
11.5 Requirements for selection of components and subsystems devices . 65
11.5.1 Objectives . 67
11.5.2 General requirements . 67
11.5.3 Requirements for the selection of components and subsystems devices
based on prior use . 67
11.5.4 Requirements for selection of FPL programmable components and
susbsystems devices (e.g., field devices) based on prior use . 69
11.5.5 Requirements for selection of LVL programmable components and
subsystems (for example, logic solvers) devices based on prior use . 69
11.5.6 Requirements for selection of FVL programmable components and
subsystems (for example, logic solvers) devices . 70
11.6 Field devices . 70
11.7 Interfaces . 71
11.7.1 General . 71
11.7.2 Operator interface requirements . 71
11.7.3 Maintenance/engineering interface requirements . 72
11.7.4 Communication interface requirements . 73
11.8 Maintenance or testing design requirements . 73
11.9 SIF probability of failure Quantification of random failure . 74
12 Requirements for application software, including selection criteria for utility software .
12.1 Application software safety life-cycle requirements .
12.2 Application software safety requirements specification .
12.3 Application software safety validation planning .
12.4 Application software design and development .
12.5 Integration of the application software with the SIS subsystem .
12.6 FPL and LVL software modification procedures .
12.7 Application software verification .
12 SIS application program development . 92
12.1 Objective . 92
12.2 General requirements . 92
12.3 Application program design . 93
12.4 Application program implementation . 94
12.5 Requirements for application program verification (review and testing) . 95
12.6 Requirements for application program methodology and tools . 96
13 Factory acceptance test (FAT) . 76
13.1 Objective . 96
13.2 Recommendations. 96
14 SIS installation and commissioning . 98
14.1 Objectives . 98
14.2 Requirements . 98
15 SIS safety validation . 99
15.1 Objective . 99
15.2 Requirements . 99
16 SIS operation and maintenance . 102
16.1 Objectives . 102
16.2 Requirements . 102
16.3 Proof testing and inspection . 104
16.3.1 Proof testing . 104
16.3.2 Inspection . 105
– 4 – IEC 61511-1:2016 RLV IEC 2016
16.3.3 Documentation of proof tests and inspecti
...
IEC 61511-1 ®
Edition 2.1 2017-08
CONSOLIDATED VERSION
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STANDARD
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Functional safety – Safety instrumented systems for the process industry
sector –
Part 1: Framework, definitions, system, hardware and application programming
requirements
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
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copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
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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.
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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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Technical Specifications, Technical Reports and other English and French, with equivalent terms in 16 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.
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variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and
CISPR.
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IEC 61511-1 ®
Edition 2.1 2017-08
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
colour
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Functional safety – Safety instrumented systems for the process industry
sector –
Part 1: Framework, definitions, system, hardware and application programming
requirements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 13.110; 25.040.01 ISBN 978-2-8322-4752-5
IEC 61511-1 ®
Edition 2.1 2017-08
CONSOLIDATED VERSION
REDLINE VERSION
colour
inside
Functional safety – Safety instrumented systems for the process industry
sector –
Part 1: Framework, definitions, system, hardware and application programming
requirements
– 2 – IEC 61511-1:2016+AMD1:2017 CSV
© IEC 2017
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 9
2 Normative references . 12
3 Terms, definitions and abbreviations . 13
3.1 Terms . 13
3.2 Terms and definitions . 13
3.3 Abbreviations . 31
4 Conformance to the IEC 61511-1:2016 . 32
5 Management of functional safety . 32
5.1 Objective . 32
5.2 Requirements . 33
5.2.1 General . 33
5.2.2 Organization and resources . 33
5.2.3 Risk evaluation and risk management . 33
5.2.4 Safety planning . 33
5.2.5 Implementing and monitoring . 34
5.2.6 Assessment, auditing and revisions . 34
5.2.7 SIS configuration management . 37
6 Safety life-cycle requirements . 37
6.1 Objectives . 37
6.2 Requirements . 38
6.3 Application program SIS safety life-cycle requirements . 40
7 Verification . 43
7.1 Objective . 43
7.2 Requirements . 43
8 Process H&RA . 45
8.1 Objectives . 45
8.2 Requirements . 45
9 Allocation of safety functions to protection layers . 46
9.1 Objectives . 46
9.2 Requirements of the allocation process . 46
9.3 Requirements on the basic process control system as a protection layer . 49
9.4 Requirements for preventing common cause, common mode and dependent
failures . 50
10 SIS safety requirements specification (SRS) . 50
10.1 Objective . 50
10.2 General requirements . 50
10.3 SIS safety requirements . 51
11 SIS design and engineering . 53
11.1 Objective . 53
11.2 General requirements . 53
11.3 Requirements for system behaviour on detection of a fault . 54
11.4 Hardware fault tolerance . 55
11.5 Requirements for selection of devices . 56
© IEC 2017
11.5.1 Objectives . 56
11.5.2 General requirements . 56
11.5.3 Requirements for the selection of devices based on prior use . 56
11.5.4 Requirements for selection of FPL programmable devices (e.g., field
devices) based on prior use . 57
11.5.5 Requirements for selection of LVL programmable devices based on
prior use . 58
11.5.6 Requirements for selection of FVL programmable devices . 59
11.6 Field devices. 59
11.7 Interfaces . 59
11.7.1 General . 59
11.7.2 Operator interface requirements . 59
11.7.3 Maintenance/engineering interface requirements . 60
11.7.4 Communication interface requirements . 60
11.8 Maintenance or testing design requirements . 61
11.9 Quantification of random failure . 61
12 SIS application program development . 63
12.1 Objective . 63
12.2 General requirements . 63
12.3 Application program design . 64
12.4 Application program implementation . 65
12.5 Requirements for application program verification (review and testing) . 66
12.6 Requirements for application program methodology and tools . 67
13 Factory acceptance test (FAT) . 68
13.1 Objective . 68
13.2 Recommendations . 68
14 SIS installation and commissioning . 69
14.1 Objectives . 69
14.2 Requirements . 69
15 SIS safety validation . 70
15.1 Objective . 70
15.2 Requirements . 70
16 SIS operation and maintenance . 73
16.1 Objectives . 73
16.2 Requirements . 73
16.3 Proof testing and inspection . 75
16.3.1 Proof testing . 75
16.3.2 Inspection . 76
16.3.3 Documentation of proof tests and inspection . 76
17 SIS modification . 76
17.1 Objectives . 76
17.2 Requirements . 77
18 SIS decommissioning . 77
18.1 Objectives .
...
IEC 61511-1 ®
Edition 2.0 2016-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Functional safety – Safety instrumented systems for the process industry
sector –
Part 1: Framework, definitions, system, hardware and application programming
requirements
Sécurite fonctionnelle – Systèmes instrumentes de sécurité pour le secteur des
industries de transformation –
Partie 1: Cadre, définitions, exigences pour le système, le matériel et la
programmation d'application
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
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copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
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Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
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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
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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.
IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing 20 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 15 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. 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 65 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and
CISPR.
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IEC 61511-1 ®
Edition 2.0 2016-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Functional safety – Safety instrumented systems for the process industry
sector –
Part 1: Framework, definitions, system, hardware and application programming
requirements
Sécurite fonctionnelle – Systèmes instrumentes de sécurité pour le secteur des
industries de transformation –
Partie 1: Cadre, définitions, exigences pour le système, le matériel et la
programmation d'application
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.110; 25.040.01 ISBN 978-2-8322-3159-3
– 2 – IEC 61511-1:2016 IEC 2016
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 9
2 Normative references. 12
3 Terms, definitions and abbreviations . 13
3.1 Terms . 13
3.2 Terms and definitions . 13
3.3 Abbreviations . 31
4 Conformance to the IEC 61511-1:2016 . 33
5 Management of functional safety . 33
5.1 Objective . 33
5.2 Requirements . 33
5.2.1 General . 33
5.2.2 Organization and resources . 33
5.2.3 Risk evaluation and risk management . 34
5.2.4 Safety planning . 34
5.2.5 Implementing and monitoring . 34
5.2.6 Assessment, auditing and revisions . 35
5.2.7 SIS configuration management . 37
6 Safety life-cycle requirements . 37
6.1 Objectives . 37
6.2 Requirements . 38
6.3 Application program SIS safety life-cycle requirements . 40
7 Verification . 43
7.1 Objective . 43
7.2 Requirements . 43
8 Process H&RA . 45
8.1 Objectives . 45
8.2 Requirements . 45
9 Allocation of safety functions to protection layers . 46
9.1 Objectives . 46
9.2 Requirements of the allocation process . 46
9.3 Requirements on the basic process control system as a protection layer . 49
9.4 Requirements for preventing common cause, common mode and dependent
failures . 50
10 SIS safety requirements specification (SRS) . 50
10.1 Objective . 50
10.2 General requirements . 50
10.3 SIS safety requirements . 50
11 SIS design and engineering . 53
11.1 Objective . 53
11.2 General requirements . 53
11.3 Requirements for system behaviour on detection of a fault . 54
11.4 Hardware fault tolerance . 55
11.5 Requirements for selection of devices . 56
11.5.1 Objectives . 56
11.5.2 General requirements . 56
11.5.3 Requirements for the selection of devices based on prior use . 56
11.5.4 Requirements for selection of FPL programmable devices (e.g., field
devices) based on prior use . 57
11.5.5 Requirements for selection of LVL programmable devices based on
prior use . 58
11.5.6 Requirements for selection of FVL programmable devices . 59
11.6 Field devices . 59
11.7 Interfaces . 59
11.7.1 General . 59
11.7.2 Operator interface requirements . 59
11.7.3 Maintenance/engineering interface requirements . 60
11.7.4 Communication interface requirements . 60
11.8 Maintenance or testing design requirements . 61
11.9 Quantification of random failure . 61
12 SIS application program development . 63
12.1 Objective . 63
12.2 General requirements . 63
12.3 Application program design . 64
12.4 Application program implementation . 65
12.
...
IEC 61511-1 ®
Edition 2.1 2017-08
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONAL
colour
inside
Functional safety – Safety instrumented systems for the process industry
sector –
Part 1: Framework, definitions, system, hardware and application programming
requirements
Sécurité fonctionnelle – Systèmes instrumentes de sécurité pour le secteur des
industries de transformation –
Partie 1: Cadre, définitions, exigences pour le système, le matériel et la
programmation d'application
IEC 61511-12016-02+AMD1:2017-08 CSV(en-fr)
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
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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
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IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
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 corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary
(IEV) online.
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IEC Customer Service Centre - webstore.iec.ch/csc entries have been collected from earlier publications of IEC
If you wish to give us your feedback on this publication or TC 37, 77, 86 and CISPR.
need further assistance, please contact the Customer Service
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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
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
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en utilisant différents critères (numéro de référence, texte, anglais et en français, ainsi que les termes équivalents dans
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IEC 61511-1 ®
Edition 2.1 2017-08
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONAL
colour
inside
Functional safety – Safety instrumented systems for the process industry
sector –
Part 1: Framework, definitions, system, hardware and application programming
requirements
Sécurité fonctionnelle – Systèmes instrumentes de sécurité pour le secteur des
industries de transformation –
Partie 1: Cadre, définitions, exigences pour le système, le matériel et la
programmation d'application
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.110; 25.040.01 ISBN 978-2-8322-8012-6
IEC 61511-1 ®
Edition 2.1 2017-08
CONSOLIDATED VERSION
REDLINE VERSION
VERSION REDLINE
colour
inside
Functional safety – Safety instrumented systems for the process industry
sector –
Part 1: Framework, definitions, system, hardware and application programming
requirements
Sécurité fonctionnelle – Systèmes instrumentes de sécurité pour le secteur des
industries de transformation –
Partie 1: Cadre, définitions, exigences pour le système, le matériel et la
programmation d'application
IEC 61511-12016-02+AMD1:2017-08 CSV(en-fr)
– 2 – IEC 61511-1:2016+AMD1:2017 CSV
© IEC 2017
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 9
2 Normative references . 12
3 Terms, definitions and abbreviations . 13
3.1 Terms . 13
3.2 Terms and definitions . 13
3.3 Abbreviations . 31
4 Conformance to the IEC 61511-1:2016 . 32
5 Management of functional safety . 32
5.1 Objective . 32
5.2 Requirements . 33
5.2.1 General . 33
5.2.2 Organization and resources . 33
5.2.3 Risk evaluation and risk management . 33
5.2.4 Safety planning . 33
5.2.5 Implementing and monitoring . 34
5.2.6 Assessment, auditing and revisions . 34
5.2.7 SIS configuration management . 37
6 Safety life-cycle requirements . 37
6.1 Objectives . 37
6.2 Requirements . 38
6.3 Application program SIS safety life-cycle requirements . 40
7 Verification . 43
7.1 Objective . 43
7.2 Requirements . 43
8 Process H&RA . 45
8.1 Objectives . 45
8.2 Requirements . 45
9 Allocation of safety functions to protection layers . 46
9.1 Objectives . 46
9.2 Requirements of the allocation process . 46
9.3 Requirements on the basic process control system as a protection layer . 49
9.4 Requirements for preventing common cause, common mode and dependent
failures . 50
10 SIS safety requirements specification (SRS) . 50
10.1 Objective . 50
10.2 General requirements . 50
10.3 SIS safety requirements . 51
11 SIS design and engineering . 53
11.1 Objective . 53
11.2 General requirements . 53
11.3 Requirements for system behaviour on detection of a fault . 54
11.4 Hardware fault tolerance . 55
11.5 Requirements for selection of devices . 56
© IEC 2017
11.5.1 Objectives . 56
11.5.2 General requirements . 56
11.5.3 Requirements for the selection of devices based on prior use . 56
11.5.4 Requirements for selection of FPL programmable devices (e.g., field
devices) based on prior use . 57
11.5.5 Requirements for selection of LVL programmable devices based on
prior use . 58
11.5.6 Requirements for selection of FVL programmable devices . 59
11.6 Field devices. 59
11.7 Interfaces . 59
11.7.1 General . 59
11.7.2 Operator interface requirements . 59
11.7.3 Maintenance/engineering interface requirements . 60
11.7.4 Communication interface requirements . 60
11.8 Maintenance or testing design requirements . 61
11.9 Quantification of random failure . 61
12 SIS application program development . 63
12.1 Objective . 63
12.2 General requirements .
...
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