IEC 61511-2:2016
(Main)Functional safety - Safety instrumented systems for the process industry sector - Part 2: Guidelines for the application of IEC 61511-1:2016
Functional safety - Safety instrumented systems for the process industry sector - Part 2: Guidelines for the application of IEC 61511-1:2016
IEC 61511-2:2016 is available as IEC 61511-2:2016 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 61511-2:2016 provides guidance on the specification, design, installation, operation and maintenance of SIFs and related SIS as defined in IEC 61511-1:2016. This second edition cancels and replaces the first edition published in 2003. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- guidance examples based on all phases of the safety life cycle provided based on usage experience with IEC 61511 1st edition;
- annexes replaced to address transition from software to application programming.
Sécurité fonctionnelle - Systèmes instrumentés de sécurité pour le secteur des industries de transformation - Partie 2: Lines directrices pour l'application de l'IEC 61511-1:2016
L'IEC 61511-2:2016 donne les lignes directrices relatives à la spécification, la conception, l'installation, au fonctionnement et à la maintenance des SIF et des SIS associés, telles que définies dans l'IEC 61511-1:2016. Cette deuxième édition annule et remplace la première édition parue en 2003. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- description des exemples d'orientation, basés sur toutes les phases du cycle de vie de sécurité, réalisée avec des exemples basés sur l'expérience de l'utilisation de la norme IEC 61511 première édition;
- remplacement des annexes pour répondre à la transition de logiciel à programmation d'application.
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IEC 61511-2 ®
Edition 2.0 2016-07
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Functional safety – Safety instrumented systems for the process industry
sector –
Part 2: Guidelines for the application of IEC 61511-1:2016
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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IEC 61511-2 ®
Edition 2.0 2016-07
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Functional safety – Safety instrumented systems for the process industry
sector –
Part 2: Guidelines for the application of IEC 61511-1:2016
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 13.110; 25.040.01 ISBN 978-2-8322-3549-2
– 2 – IEC 61511-2:2016 RLV © IEC 2016
CONTENTS
FOREWORD . 9
INTRODUCTION . 11
1 Scope . 13
2 Normative references . 13
3 Terms, definitions, and abbreviations . 13
Annex A (informative) Guidance for IEC 61511-1 . 14
A.1 Scope . 14
A.2 Normative references . 14
A.3 Terms, definitions and abbreviations . 14
A.4 Conformance to this International Standard the IEC 61511-1:– . 14
A.5 Management of functional safety . 14
A.5.1 Objective . 14
A.5.2 Guidance to "Requirements" . 15
A.6 Safety life-cycle requirements . 23
A.6.1 Objectives . 23
A.6.2 Guidance to "Requirements" . 23
A.6.3 Guidance to "Application program SIS safety life-cycle requirements" . 24
A.7 Verification . 25
A.7.1 Objective . 25
A.7.2 Guidance to "Requirements" . 25
A.8 Process hazard and risk assessment (H&RA) . 27
A.8.1 Objectives . 27
A.8.2 Guidance to "Requirements" . 27
A.9 Allocation of safety functions to protection layers . 30
A.9.1 Objective . 30
A.9.2 Guidance to "Requirementsof the allocation process" . 31
A.9.3 Guidance to "Requirements on the basic process control system as a
protection layer" . 33
A.9.4 Guidance to "Requirements for preventing common cause, common
mode and dependent failures" . 36
A.10 SIS safety requirements specification . 37
A.10.1 Objective . 37
A.10.2 Guidance to "General requirements" . 37
A.10.3 Guidance to "SIS safety requirements" . 37
A.11 SIS design and engineering . 42
A.11.1 Objective . 42
A.11.2 Guidance to "General requirements" . 42
A.11.3 Guidance to "Requirements for system behaviour on detection of a
fault" . 50
A.11.4 Requirements Guidance to "Hardware fault tolerance" . 50
A.11.5 Guidance to "Requirements for selection of components and
subsystems devices" . 53
A.11.6 Field devices . 57
A.11.7 Interfaces . 57
A.11.8 Guidance to "Maintenance or testing design requirements" . 59
A.11.9 SIF probability of failure Guidance to "Quantification of random failure" . 60
12 Requirements for application software, including selection criteria for utility .
software .
12.1 Application software safety lifecycle 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 .
A.12 SIS application program development . 81
A.12.1 Objective . 81
A.12.2 Guidance to "General requirements" . 81
A.12.4 Guidance to "Application program implementation" . 84
A.12.3 Guidance to "Application program design" . 82
A.12.5 Guidance to "Requirements for application program verification (review
and testing)" . 85
A.12.6 Guidance to "Requirements for application program methodology and
tools" . 89
A.13 Factory acceptance testing (FAT) . 91
A.13.1 Objectives . 91
A.13.2 Guidance to "Recommendations" . 91
A.14 SIS installation and commissioning . 91
A.14.1 Objectives . 91
A.14.2 Guidance to "Requirements" . 92
A.15 SIS safety validation . 92
A.15.1 Objective . 92
A.15.2 Guidance to "Requirements" . 92
A.16 SIS operation and maintenance . 93
A.16.1 Objectives . 93
A.16.2 Guidance to "Requirements" . 93
A.16.3 Proof testing and inspection . 94
A.17 SIS modification . 97
A.17.1 Objective . 97
A.17.2 Guidance to "Requirements" . 97
A.18 SIS decommissioning . 98
A.18.1 Objectives . 98
A.18.2 Guidance to "Requirements" . 98
A.19 Information and documentation requirements . 98
A.19.1 Objectives . 98
A.19.2 Guidance to "Requirements" . 98
Annex A (informative) Example of techniques for calculating the probability of failure
on demand for a safety instrumented function .
Annex B (informative) Typical SIS architecture development .
Annex B (informative) Example of SIS logic solver application program development
using function block diagram . 106
B.1 General . 106
B.2 Application program development and validation philosophy . 106
B.3 Application description . 107
B.3.1 General . 107
– 4 – IEC 61511-2:2016 RLV © IEC 2016
B.3.2 Process description . 107
B.3.3 Safety instrumented functions . 108
B.3.4 Risk reduction and domino effects .
...
IEC 61511-2 ®
Edition 2.0 2016-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Functional safety – Safety instrumented systems for the process industry
sector –
Part 2: Guidelines for the application of IEC 61511-1: 2016
Sécurité fonctionnelle – Systèmes instrumentés de sécurité pour le secteur
des industries de transformation –
Partie 2: Lignes directrices pour l'application de l'IEC 61511-1:2016
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
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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
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IEC 61511-2 ®
Edition 2.0 2016-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Functional safety – Safety instrumented systems for the process industry
sector –
Part 2: Guidelines for the application of IEC 61511-1: 2016
Sécurité fonctionnelle – Systèmes instrumentés de sécurité pour le secteur
des industries de transformation –
Partie 2: Lignes directrices pour l'application de l'IEC 61511-1:2016
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.110; 25.040.01 ISBN 978-2-8322-3227-9
– 2 – IEC 61511-2:2016 © IEC 2016
CONTENTS
FOREWORD. 9
INTRODUCTION . 11
1 Scope . 13
2 Normative references . 13
3 Terms, definitions, and abbreviations . 13
Annex A (informative) Guidance for IEC 61511-1 . 14
A.1 Scope . 14
A.2 Normative references . 14
A.3 Terms, definitions and abbreviations . 14
A.4 Conformance to the IEC 61511-1:– . 14
A.5 Management of functional safety . 14
A.5.1 Objective . 14
A.5.2 Guidance to "Requirements" . 14
A.6 Safety life-cycle requirements . 23
A.6.1 Objectives . 23
A.6.2 Guidance to "Requirements" . 23
A.6.3 Guidance to "Application program SIS safety life-cycle requirements" . 24
A.7 Verification . 25
A.7.1 Objective . 25
A.7.2 Guidance to "Requirements" . 25
A.8 Process hazard and risk assessment (H&RA) . 27
A.8.1 Objectives . 27
A.8.2 Guidance to “Requirements" . 27
A.9 Allocation of safety functions to protection layers . 30
A.9.1 Objective . 30
A.9.2 Guidance to "Requirements of the allocation process". 30
A.9.3 Guidance to "Requirements on the basic process control system as a
protection layer" . 32
A.9.4 Guidance to "Requirements for preventing common cause, common
mode and dependent failures" . 35
A.10 SIS safety requirements specification . 36
A.10.1 Objective . 36
A.10.2 Guidance to "General requirements" . 36
A.10.3 Guidance to "SIS safety requirements" . 36
A.11 SIS design and engineering . 40
A.11.1 Objective . 40
A.11.2 Guidance to "General requirements" . 40
A.11.3 Guidance to "Requirements for system behaviour on detection of a
fault" . 47
A.11.4 Guidance to “Hardware fault tolerance" . 47
A.11.5 Guidance to "Requirements for selection of devices" . 50
A.11.6 Field devices . 53
A.11.7 Interfaces . 53
A.11.8 Guidance to "Maintenance or testing design requirements" . 55
A.11.9 Guidance to "Quantification of random failure" . 56
A.12 SIS application program development . 62
A.12.1 Objective . 62
A.12.2 Guidance to "General requirements" . 62
A.12.3 Guidance to "Application program design" . 64
A.12.4 Guidance to "Application program implementation" . 66
A.12.5 Guidance to "Requirements for application program verification (review
and testing)" . 67
A.12.6 Guidance to "Requirements for application program methodology and
tools" . 70
A.13 Factory acceptance testing (FAT) . 73
A.13.1 Objectives . 73
A.13.2 Guidance to "Recommendations" . 73
A.14 SIS installation and commissioning . 73
A.14.1 Objectives . 73
A.14.2 Guidance to "Requirements" . 73
A.15 SIS safety validation . 74
A.15.1 Objective . 74
A.15.2 Guidance to "Requirements" . 74
A.16 SIS operation and maintenance . 74
A.16.1 Objectives . 74
A.16.2 Guidance to "Requirements" . 75
A.16.3 Proof testing and inspection . 76
A.17 SIS modification . 78
A.17.1 Objective . 78
A.17.2 Guidance to "Requirements" .
...
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