IEC 61511-2:2003
(Main)Functional safety - Safety instrumented systems for the process industry sector - Part 2: Guidelines for the application of IEC 61511-1
Functional safety - Safety instrumented systems for the process industry sector - Part 2: Guidelines for the application of IEC 61511-1
provides guidance on the specification, design, installation, operation and maintenance of Safety Instrumented Functions and related safety instrumented system as defined in IEC 61511-1. This standard has been organized so that each clause and subclause number herein addresses the same clause number in IEC 61511-1 (with the exception of the annexes). It has the status of a horizontal standard in accordance with IEC Guide 108.
Sécurité fonctionnelle - Systèmes instrumentés de sécurité pour le secteur des industries de transformation - Partie 2: Lignes directrices pour l'application de la CEI 61511-1
donne des conseils sur la spécification, la conception, l'installation, l'exploitation et la maintenance des fonctions instrumentées de sécurité et du système instrumenté de sécurité concerné, comme cela est défini par la CEI 61511-1. La présente Partie 2 de la CEI 61511 a été organisée de sorte que chaque numéro d'article mentionné corresponde au même numéro d'article que celui de la CEI 61511-1 (à l'exception des annexes). Elle a le statut d'une norme horizontale conformément au Guide 108 de la CEI.
General Information
Relations
Buy Standard
Standards Content (Sample)
INTERNATIONAL IEC
STANDARD
61511-2
First edition
2003-07
Functional safety –
Safety instrumented systems
for the process industry sector –
Part 2:
Guidelines for the application of IEC 61511-1
Reference number
Publication numbering
As from 1 January 1997 all IEC publications are issued with a designation in the
60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1.
Consolidated editions
The IEC is now publishing consolidated versions of its publications. For example,
edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the base publication, the
base publication incorporating amendment 1 and the base publication incorporating
amendments 1 and 2.
Further information on IEC publications
The technical content of IEC publications is kept under constant review by the IEC,
thus ensuring that the content reflects current technology. Information relating to
this publication, including its validity, is available in the IEC Catalogue of
publications (see below) in addition to new editions, amendments and corrigenda.
Information on the subjects under consideration and work in progress undertaken
by the technical committee which has prepared this publication, as well as the list
of publications issued, is also available from the following:
• IEC Web Site (www.iec.ch)
• Catalogue of IEC publications
The on-line catalogue on the IEC web site (www.iec.ch/searchpub) enables you to
search by a variety of criteria including text searches, technical committees
and date of publication. On-line information is also available on recently issued
publications, withdrawn and replaced publications, as well as corrigenda.
• IEC Just Published
This summary of recently issued publications (www.iec.ch/online_news/ justpub)
is also available by email. Please contact the Customer Service Centre (see
below) for further information.
• Customer Service Centre
If you have any questions regarding this publication or need further assistance,
please contact the Customer Service Centre:
Email: custserv@iec.ch
Tel: +41 22 919 02 11
Fax: +41 22 919 03 00
INTERNATIONAL IEC
STANDARD
61511-2
First edition
2003-07
Functional safety –
Safety instrumented systems
for the process industry sector –
Part 2:
Guidelines for the application of IEC 61511-1
IEC 2003 Copyright - all rights reserved
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 the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale
XB
International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue
– 2 – 61511-2 IEC:2003(E)
CONTENTS
FOREWORD . 4
INTRODUCTION .6
1 Scope . 8
2 Normative references. 8
3 Terms, definitions and abbreviations. 8
4 Conformance to this International Standard . 8
5 Management of functional safety. 9
5.1 Objective . 9
5.2 Requirements . 9
6 Safety lifecycle requirements .15
6.1 Objective .15
6.2 Requirements .15
7 Verification .15
7.1 Objective .15
8 Process hazard and risk assessment .16
8.1 Objectives .16
8.2 Requirements .16
9 Allocation of safety functions to protection layers.19
9.1 Objective .19
9.2 Requirements of the allocation process .19
9.3 Additional requirements for safety integrity level 4 .21
9.4 Requirement on the basic process control system as a layer of protection .21
9.5 Requirements for preventing common cause, common mode and dependent
failures .22
10 SIS safety requirements specification .23
10.1 Objective .23
10.2 General requirements .23
10.3 SIS safety requirements.23
11 SIS design and engineering .24
11.1 Objective .24
11.2 General requirements .24
11.3 Requirements for system behaviour on detection of a fault .28
11.4 Requirements for hardware fault tolerance.28
11.5 Requirements for selection of components and subsystems .30
11.6 Field devices .32
11.7 Interfaces .32
11.8 Maintenance or testing design requirements .34
11.9 SIF probability of failure.35
12 Requirements for application software, including selection criteria for utility
software.37
12.1 Application software safety lifecycle requirements .37
12.2 Application software safety requirements specification.40
12.3 Application software safety validation planning .42
12.4 Application software design and development.42
61511-2 IEC:2003(E) – 3 –
12.5 Integration of the application software with the SIS subsystem .49
12.6 FPL and LVL software modification procedures .49
12.7 Application software verification.50
13 Factory acceptance testing (FAT) .51
13.1 Objectives .51
13.2 Recommendations .51
14 SIS installation and commissioning.52
14.1 Objectives .52
14.2 Requirements .52
15 SIS safety validation .52
15.1 Objective .52
15.2 Requirements .52
16 SIS operation and maintenance .53
16.1 Objectives .53
16.2 Requirements .53
16.3 Proof testing and inspection.53
17 SIS modification.55
17.1 Objective .55
17.2 Requirements .55
18 SIS decommissioning.55
18.1 Objectives .55
18.2 Requirements .55
19 Information and documentation requirements.55
19.1 Objectives .55
19.2 Requirements .55
Annex A (informative) Example of techniques for calculating the probability of failure
on demand for a safety instrumented function .57
Annex B (informative) Typical SIS architecture development.58
Annex C (informative) Application features of a safety PLC.63
Annex D (informative) Example of SIS logic solver application software development
methodology .65
Annex E (informative) Example of development of externally configured diagnostics
for a safety-configured PE logic solver .69
Figure 1 – Overall framework of this standard . 7
Figure 2 – BPCS function and initiating cause independence illustration .21
Figure 3 – Software development lifecycle (the V-model) .38
Figure C.1 – Logic solver .64
Figure E.1 – EWDT timing diagram .71
Table 1 – Typical Safety Manual organisation and contents .47
– 4 – 61511-2 IEC:2003(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FUNCTIONAL SAFETY –
SAFETY INSTRUMENTED SYSTEMS
FOR THE PROCESS INDUSTRY SECTOR –
Part 2: Guidelines for the application of IEC 61511-1
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
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, and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to
technical committees; any IEC National Committee interested in the subject dealt with may participate in this
preparatory work. International, governmental and non-governmental organizations liaising with the IEC also
participate in this preparation. IEC collaborates closely with the International Organization for Standardization
(ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable effor
...
IEC 61511-2
Edition 1.0 2003-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Functional safety – Safety instrumented systems for the process industry sector –
Part 2: Guidelines for the application of IEC 61511-1
Sécurité fonctionnelle – Systèmes instrumentés de sécurité pour le secteur des
industries de transformation –
Partie 2: Lignes directrices pour l’application de la CEI 61511-1
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 la CEI ou du Comité national de la CEI du pays du demandeur.
Si vous avez des questions sur le copyright de la CEI ou si vous désirez obtenir des droits supplémentaires sur cette
publication, utilisez les coordonnées ci-après ou contactez le Comité national de la CEI de votre pays de résidence.
IEC Central Office
3, rue de Varembé
CH-1211 Geneva 20
Switzerland
Email: inmail@iec.ch
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.
ƒ 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.
ƒ IEC Just Published: www.iec.ch/online_news/justpub
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.
ƒ Electropedia: www.electropedia.org
The world's leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions
in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical
Vocabulary online.
ƒ 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: csc@iec.ch
Tel.: +41 22 919 02 11
Fax: +41 22 919 03 00
A propos de la CEI
La Commission Electrotechnique Internationale (CEI) 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 CEI
Le contenu technique des publications de la CEI est constamment revu. Veuillez vous assurer que vous possédez
l’édition la plus récente, un corrigendum ou amendement peut avoir été publié.
ƒ Catalogue des publications de la CEI: www.iec.ch/searchpub/cur_fut-f.htm
Le Catalogue en-ligne de la CEI vous permet d’effectuer des recherches en utilisant différents critères (numéro de référence,
texte, comité d’études,…). Il donne aussi des informations sur les projets et les publications retirées ou remplacées.
ƒ Just Published CEI: www.iec.ch/online_news/justpub
Restez informé sur les nouvelles publications de la CEI. Just Published détaille deux fois par mois les nouvelles
publications parues. Disponible en-ligne et aussi par email.
ƒ Electropedia: www.electropedia.org
Le premier dictionnaire en ligne au monde de termes électroniques et électriques. Il contient plus de 20 000 termes et
définitions en anglais et en français, ainsi que les termes équivalents dans les langues additionnelles. Egalement appelé
Vocabulaire Electrotechnique International en ligne.
ƒ Service Clients: www.iec.ch/webstore/custserv/custserv_entry-f.htm
Si vous désirez nous donner des commentaires sur cette publication ou si vous avez des questions, visitez le FAQ du
Service clients ou contactez-nous:
Email: csc@iec.ch
Tél.: +41 22 919 02 11
Fax: +41 22 919 03 00
IEC 61511-2
Edition 1.0 2003-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Functional safety – Safety instrumented systems for the process industry sector –
Part 2: Guidelines for the application of IEC 61511-1
Sécurité fonctionnelle – Systèmes instrumentés de sécurité pour le secteur des
industries de transformation –
Partie 2: Lignes directrices pour l’application de la CEI 61511-1
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
XC
CODE PRIX
ICS 13.110; 25.040.01 ISBN 2-8318-7556-0
– 2 – 61511-2 © IEC:2003
CONTENTS
FOREWORD.7
INTRODUCTION.6
1 Scope.9
2 Normative references.9
3 Terms, definitions and abbreviations .9
4 Conformance to this International Standard .9
5 Management of functional safety .10
5.1 Objective.10
5.2 Requirements.10
6 Safety lifecycle requirements.17
6.1 Objective.17
6.2 Requirements.17
7 Verification.18
7.1 Objective.18
8 Process hazard and risk assessment.18
8.1 Objectives.18
8.2 Requirements.18
9 Allocation of safety functions to protection layers .21
9.1 Objective.21
9.2 Requirements of the allocation process .21
9.3 Additional requirements for safety integrity level 4.24
9.4 Requirement on the basic process control system as a layer of protection.24
9.5 Requirements for preventing common cause, common mode and dependent
failures .25
10 SIS safety requirements specification .26
10.1 Objective.26
10.2 General requirements.26
10.3 SIS safety requirements .26
11 SIS design and engineering.28
11.1 Objective.28
11.2 General requirements.28
11.3 Requirements for system behaviour on detection of a fault .33
11.4 Requirements for hardware fault tolerance .33
11.5 Requirements for selection of components and subsystems .34
11.6 Field devices.37
11.7 Interfaces.37
11.8 Maintenance or testing design requirements.40
11.9 SIF probability of failure .41
12 Requirements for application software, including selection criteria for utility
software .43
12.1 Application software safety lifecycle requirements .43
12.2 Application software safety requirements specification .47
61511-2 © IEC:2003 – 3 –
12.3 Application software safety validation planning.49
12.4 Application software design and development .49
12.5 Integration of the application software with the SIS subsystem .57
12.6 FPL and LVL software modification procedures .57
12.7 Application software verification.58
13 Factory acceptance testing (FAT) .59
13.1 Objectives.59
13.2 Recommendations.59
14 SIS installation and commissioning.60
14.1 Objectives.60
14.2 Requirements.60
15 SIS safety validation.60
15.1 Objective.60
15.2 Requirements.60
16 SIS operation and maintenance.61
16.1 Objectives.61
16.2 Requirements.61
16.3 Proof testing and inspection .61
17 SIS modification.63
17.1 Objective.63
17.2 Requirements.63
18 SIS decommissioning .63
18.1 Objectives.63
18.2 Requirements.63
19 Information and documentation requirements .64
19.1 Objectives.64
19.2 Requirements.64
Annex A (informative) Example of techniques for calculating the probability of failure
on demand for a safety instrumented function.65
Annex B (informative) Typical SIS architecture development.66
Annex C (informative) Application features of a safety PLC .71
Annex D (informative) Example of SIS logic solver application software development
methodology .73
Annex E (informa
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.