CLC/TR 62061-1:2010

SLOVENSKI STANDARD
01-december-2010
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Guidance on the application of ISO 13849-1 & IEC 62061 in the design of safety-related
control systems for machinery (IEC/TR 62061-1:2010)
Anleitung zur Anwendung von ISO 13849-1 und IEC 62061 bei der Gestaltung von
sicherheitsbezogenen Steuerungen von Maschinen (IEC/TR 62061-1:2010)
Directives relatives à l'application de l'ISO 13849-1 et de la CEI 62061 dans la
conception des systèmes de commande des machines relatifs à la sécurité (CEI/TR
62061-1:2010)
Ta slovenski standard je istoveten z: CLC/TR 62061-1:2010
ICS:
13.110 Varnost strojev Safety of machinery
25.040.40 Merjenje in krmiljenje Industrial process
industrijskih postopkov measurement and control
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL REPORT
CLC/TR 62061-1
RAPPORT TECHNIQUE
August 2010
TECHNISCHER BERICHT
ICS 13.110; 25.040.99; 29.020
English version
Guidance on the application of ISO 13849-1 and IEC 62061 in the design
of safety-related control systems for machinery
(IEC/TR 62061-1:2010)
Directives relatives à l'application  Anleitung zur Anwendung von ISO 13849-1
de l'ISO 13849-1 et de la CEI 62061 und IEC 62061 bei der Gestaltung
dans la conception des systèmes von sicherheitsbezogenen Steuerungen
de commande des machines relatifs von Maschinen
à la sécurité (IEC/TR 62061-1:2010)
(CEI/TR 62061-1:2010)
This Technical Report was approved by CENELEC on 2010-07-26.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. CLC/TR 62061-1:2010 E

Foreword
The text of document 44/598/DTR, future edition 1 of IEC/TR 62061-1, prepared by IEC TC 44, Safety of
machinery - Electrotechnical aspects, was submitted to the IEC-CENELEC parallel vote and was
approved by CENELEC as CLC/TR 62061-1 on 2010-07-26.
__________
Endorsement notice
The text of the Technical Report IEC/TR 62061-1:2010 was approved by CENELEC as a Technical
Report without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 62061 NOTE  Harmonized as EN 62061.
IEC 60947-5-1:2003 NOTE  Harmonized as EN 60947-5-1:2004 ([not] modified).
IEC 61511-1 NOTE  Harmonized as EN 61511-1.
IEC 61508 series NOTE  Harmonized in EN 61508 series (not modified).
IEC 61800-5-2 NOTE  Harmonized as EN 61800-5-2.
ISO 13849-1 NOTE  Harmonized as EN ISO 13849-1.
ISO 13849-2 NOTE  Harmonized as EN ISO 13849-2.
ISO 14121-1 NOTE  Harmonized as EN ISO 14121-1.
__________
IEC/TR 62061-1 ®
Edition 1.0 2010-07
TECHNICAL
REPORT
RAPPORT
TECHNIQUE
Guidance on the application of ISO 13849-1 and IEC 62061 in the design of
safety-related control systems for machinery

Lignes directrices relatives à l'application de l'ISO 13849-1 et de la CEI 62061
dans la conception des systèmes de commande des machines relatifs à la
sécurité
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
R
CODE PRIX
ICS 13.110; 25.040.99; 29.020 ISBN 978-2-88912-042-0
– 2 – TR 62061-1 © IEC:2010
CONTENTS
FOREWORD.3
INTRODUCTION.5
1 Scope.6
2 General .6
3 Comparison of standards.6
4 Risk estimation and assignment of required performance .7
5 Safety requirements specification .7
6 Assignment of performance targets: PL versus SIL.8
7 System design.9
7.1 General requirements for system design using IEC 62061 and ISO 13849-1 .9
7.2 Estimation of PFH and MTTF and the use of fault exclusions .9
D d
7.3 System design using subsystems or SRP/CS that conform to either
IEC 62061 or ISO 13849-1 .10
7.4 System design using subsystems or SRP/CS that have been designed using
other IEC or ISO standards .10
8 Example .10
8.1 General .10
8.2 Simplified example of the design and validation of a safety-related control
system implementing a specified safety-related control function .11
8.3 Conclusion .18
Bibliography.19

Figure 1 – Example implementation of the safety function.11
Figure 2 – Safety-related block diagram.13
Figure 3 – Safety-related block diagram for calculation according to ISO 13849-1 .13
Figure 4 – Logical representation of subsystem D.15

Table 1 – Relationship between PLs and SILs based on the average probability of
dangerous failure per hour.8
Table 2 – Architectural constraints on subsystems' maximum SIL CL that can be
claimed for an SRCF using this subsystem .17

TR 62061-1 © IEC:2010 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
GUIDANCE ON THE APPLICATION OF ISO 13849-1 AND IEC 62061
IN THE DESIGN OF SAFETY-RELATED CONTROL SYSTEMS
FOR MACHINERY
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, Publicly Available Specifications (PAS) 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 efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
The main task of IEC technical committees is to prepare International Standards. However, a
technical committee may propose the publication of a technical report when it has collected
data of a different kind from that which is normally published as an International Standard, for
example "state of the art".
IEC 62016-1, which is a technical report, has been prepared jointly by Technical Committee
ISO/TC 199, Safety of machinery, and Technical Committee IEC/TC 44, Safety of machinery –
Electrotechnical aspects. The draft was circulated for voting to the national bodies of both ISO
and IEC. These technical committees have agreed that no modification will be made to this
Technical Report except by mutual agreement .

This Technical Report is published at the ISO as ISO/TR 23849.

– 4 – TR 62061-1 © IEC:2010
The text of this technical report is based on the following documents:
Enquiry draft Report on voting
44/598/DTR 44/608/RVC
Full information on the voting for the approval of this technical report can be found in the
report on voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
TR 62061-1 © IEC:2010 – 5 –
INTRODUCTION
This Technical Report has been prepared by experts from both IEC/TC 44/WG 7 and
ISO/TC 199/WG 8 in response to requests from their Technical Committees to explain the
relationship between IEC 62061 and ISO 13849-1. In particular, it is intended to assist users
of these International Standards in terms of the interaction(s) that can exist between the
standards to ensure that confidence can be given to the design of safety-related systems
made in accordance with either standard.
It is intended that this Technical Report be incorporated into both IEC 62061 and ISO 13849-1
by means of corrigenda that reference the published version of this document. These
corrigenda will also remove the information given in Table 1, Recommended application of
IEC 62061 and ISO 13849-1, provided in the common introduction to both standards, which is
now recognized as being out of date. Subsequently, it is intended to merge ISO 13849-1 and
IEC 62061 by means of a JWG of ISO/TC 199 and IEC/TC 44.

– 6 – TR 62061-1 © IEC:2010
GUIDANCE ON THE APPLICATION OF ISO 13849-1 AND IEC 62061
IN THE DESIGN OF SAFETY-RELATED CONTROL SYSTEMS
FOR MACHINERY
1 Scope
2)
This Technical Report is intended to explain the application of IEC 62061 and ISO 13849-1
in the design of safety-related control systems for machinery.
2 General
2.1 Both IEC 62061 and ISO 13849-1 specify requirements for the design and
3)
implementation of safety-related control systems of machinery . The methods developed in
both of these standards are different but, when correctly applied, can achieve a comparable
level of risk reduction.
2.2 These standards classify safety-related c
...