IEC 61496-2:2020

Safety of machinery - Electro-sensitive protective equipment - Part 2: Particular requirements for equipment using active opto-electronic protective devices (AOPDs)

IEC 61496-2:2020 specifies requirements for the design, construction and testing of electro-sensitive protective equipment (ESPE) designed specifically to detect persons as part of a safety-related system, employing active opto-electronic protective devices (AOPDs) for the sensing function. Special attention is directed to features which ensure that an appropriate safety-related performance is achieved. An ESPE can include optional safety-related functions, the requirements for which are given in Annex A of IEC 61496-1:2020 and of this document.
This document does not specify the dimensions or configurations of the detection zone and its disposition in relation to hazardous parts for any particular application, nor what constitutes a hazardous state of any machine. It is restricted to the functioning of the ESPE and how it interfaces with the machine.
Excluded from this document are AOPDs employing radiation at wavelengths outside the range 400 nm to 1 500 nm.
This document can be relevant to applications other than those for the protection of persons, for example, the protection of machinery or products from mechanical damage. In those applications, additional requirements can be necessary, for example, when the materials that are to be recognized by the sensing function have different properties from those of persons.
This document does not deal with electromagnetic compatibility (EMC) emission requirements.
IEC 61496-2:2020 cancels and replaces the third edition published in 2013. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) Requirements and test procedures in Part 2 that were found to be common to all ESPEs have been moved to Part 1. Test procedures that are dependent on the sensing technology remain in Part 2.

Sécurité des machines - Équipements de protection électrosensibles - Partie 2: Exigences particulières pour un équipement utilisant des dispositifs protecteurs optoélectroniques actifs (AOPD)

L'IEC 61496-2:2020 définit les exigences de conception, de construction et d'essai d'équipements de protection électrosensibles (ESPE) conçus spécialement pour détecter des personnes, comme partie d'un système relatif à la sécurité, utilisant des dispositifs protecteurs optoélectroniques actifs (AOPD) pour la fonction de détection. Une attention particulière est portée sur les caractéristiques assurant qu'une performance relative à la sécurité appropriée est atteinte. Un ESPE peut comporter des fonctions de sécurité facultatives. Les exigences pour ces fonctions sont données à l'Annexe A de l'IEC 61496 1:2020 et du présent document.
Le présent document ne spécifie ni les dimensions et configurations de la zone de détection, ni sa disposition par rapport aux parties dangereuses dans une application particulière, ni ce qui constitue un état dangereux pour toute machine donnée. Il se limite au fonctionnement de l'ESPE et à son interface avec la machine.
Le présent document ne traite pas des AOPD qui utilisent des longueurs d'ondes hors de la plage de 400 nm à 1 500 nm.
Le présent document peut être pertinent pour des applications autres que la protection des personnes, par exemple la protection des machines ou des produits contre des dommages mécaniques. Dans ces applications, des exigences complémentaires peuvent être nécessaires, par exemple lorsque les matériaux qui doivent être reconnus par le dispositif de détection ont des caractéristiques différentes de celles des personnes.
Le présent document ne traite pas des exigences CEM (compatibilité électromagnétique) relatives aux émissions électromagnétiques.
L'IEC 61496-2:2020 annule et remplace la troisième édition parue en 2013. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) Les exigences et procédures d’essai de la Partie 2 qui se sont révélées être communes à tous les ESPE ont été déplacées vers la Partie 1. Les procédures d’essai qui dépendent de la technologie de détection restent dans la Partie 2.

General Information

• Status: Published
• Publication Date: 14-Jul-2020
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 13.110 - Safety of machinery
• ICS: 29.260.99 - Other electrical equipment for working in special conditions
• Technical Committee: TC 44 - Safety of machinery - Electrotechnical aspects
• Drafting Committee: MT 61496-1&2 - TC 44/MT 61496-1&2
• Current Stage: PPUB - Publication issued
• Start Date: 03-Jul-2020
• Completion Date: 15-Jul-2020

Relations

• Revises: IEC 61496-2:2013 - Safety of machinery - Electro-sensitive protective equipment - Part 2: Particular requirements for equipment using active opto-electronic protective devices (AOPDs)
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61496-2 ®
Edition 4.0 2020-07
INTERNATIONAL
STANDARD
colour
inside
Safety of machinery – Electro-sensitive protective equipment –
Part 2: Particular requirements for equipment using active opto-electronic
protective devices (AOPDs)
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.

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About the IEC
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International Standards for all electrical, electronic and related technologies.

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IEC 61496-2 ®
Edition 4.0 2020-07
INTERNATIONAL
STANDARD
colour
inside
Safety of machinery – Electro-sensitive protective equipment –

Part 2: Particular requirements for equipment using active opto-electronic

protective devices (AOPDs)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 13.110; 29.260.99 ISBN 978-2-8322-8452-0

– 2 – IEC 61496-2:2020 © IEC 2020
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Functional, design and environmental requirements . 9
5 Testing . 14
6 Marking for identification and safe use . 40
7 Accompanying documents . 41
Annex A (normative) Optional functions of the ESPE . 42
Annex AA (informative) Type 2 AOPD periodic test configurations . 46

Figure 1 – Limit area for the protection against the risk of beam bypass . 12
Figure 2 – Limit of vertical and horizontal misalignment . 13
Figure 3 – Test piece at 45° . 18
Figure 4 – Test piece at 90° . 18
Figure 5 – Verifying sensing function by moving the test piece (TP) through the
detection zone near the emitter, near the receiver/retro-reflector target and at the
midpoint . 19
Figure 6 – Limit values for the effective aperture angle (EAA) . 21
Figure 7 – Determination of the minimum detection capability . 22
Figure 8 – Measuring method for EAA (direction) . 23
Figure 9 – Prism test to measure EAA of each beam . 25
Figure 10 – EAA test using prism . 26
Figure 11 – Example of optical subsystem . 27
Figure 12 – Example of SMD LED Model . 28
Figure 13 – Example of intensity distribution of emitting element . 28
Figure 14 – Example of emitter model with beams internally blocked by aperture stop . 29
Figure 15 – Example of receiving unit with off axis beam portion reflected internally on
mechanical elements . 29
Figure 16 – Example of test piece inside model of optical subsystem with passing
radiation on the receiver . 30
Figure 17 – Example of emitting unit adjusted at the limit . 31
Figure 18 – Extraneous reflection test with mirror outside of limit area . 32
Figure 19 – AOPD misalignment test . 34
Figure 20 – Light interference test – Direct method . 36
Figure 21 – Light interference test – Test set-up with incandescent light source . 37
Figure 22 – Light interference test – Test set-up with fluorescent light source . 38
Figure 23 – Light interference test – Test set-up with flashing beaconlight source . 39
Figure AA.1 – Single beam sensing device . 46
Figure AA.2 – Series connection of single beam sensing devices . 46
Figure AA.3 – Assembly of multiple beams tested individually. 46
Figure AA.4 – Example of type 2 AOPD with internal test . 47

Table 1 – Correspondences of requirements/testing and AOPD designs . 15
Table 2 – Maximum permissible angle of misalignment (in degrees) for a type 2 ESPE
depending on the dimensions of the light curtain . 32
Table 3 – Maximum permissible angle of misalignment (in degrees) for a type 3 ESPE
depending on the dimensions of the light curtain . 33
Table 4 – Maximum permissible angle of misalignment (in degrees) for a type 4 ESPE
depending on the dimensions of the light curtain . 33

– 4 – IEC 61496-2:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SAFETY OF MACHINERY –
ELECTRO-SENSITIVE PROTECTIVE EQUIPMENT –

Part 2: Particular requirements for equipment using
active opto-electronic protective devices (AOPDs)

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
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Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
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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.
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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61496-2 has been prepared by IEC technical committee 44: Safety
of machinery – Electrotechnical aspects, in collaboration with CENELEC technical committee
44X: Safety of machinery – Electrotechnical aspects.
This fourth edition cancels and replaces the third edition published in 2013. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Requirements and test procedures in Part 2 that were found to be common to all ESPEs
have been moved to Part 1. Test procedures that are dependent on the sensing
technology remain in Part 2.
The text of this International Standard is based on the following documents:
FDIS Report on voting
44/875/FDIS 44/878/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
This standard has the status of a product family standard and can be used as a normative
reference in a dedicated product standard for the safety of machinery.
This standard is to be used in conjunction with IEC 61496-1:2020.
This part supplements or modifies the corresponding clauses in IEC 61496-1:2020.
Where a particular clause or subclause of IEC 61496-1:2020 is not mentioned in this Part 2,
that clause or subclause applies as far as is reasonable. Where this part states "Addition",
"Modification" or "Replacement", the relevant text of IEC 61496-1:2020 is adapted
accordingly.
Clauses and subclauses which are additional to those of Part 1 are numbered sequentially,
following on the last available number in Part 1. Terminological entries (in Clause 3) which are
additional to those in Part 1 are numbered starting from 3.201. Additional annexes are
lettered from AA onwards.
A list of all parts in the IEC 61496 series, published under the general title Safety of
machinery – Electro-sensitive protective equipme
...

IEC 61496-2 ®
Edition 4.0 2020-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Safety of machinery – Electro-sensitive protective equipment –
Part 2: Particular requirements for equipment using active opto-electronic
protective devices (AOPDs)
Sécurité des machines – Équipements de protection électrosensibles –
Partie 2: Exigences particulières pour un équipement utilisant des dispositifs
protecteurs optoélectroniques actifs (AOPD)

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International Standards for all electrical, electronic and related technologies.

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IEC 61496-2 ®
Edition 4.0 2020-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Safety of machinery – Electro-sensitive protective equipment –

Part 2: Particular requirements for equipment using active opto-electronic

protective devices (AOPDs)
Sécurité des machines – Équipements de protection électrosensibles –

Partie 2: Exigences particulières pour un équipement utilisant des dispositifs

protecteurs optoélectroniques actifs (AOPD)

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.110; 29.260.99 ISBN 978-2-8322-9447-5

– 2 – IEC 61496-2:2020 © IEC 2020
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Functional, design and environmental requirements . 9
5 Testing . 14
6 Marking for identification and safe use . 40
7 Accompanying documents . 41
Annex A (normative) Optional functions of the ESPE . 42
Annex AA (informative) Type 2 AOPD periodic test configurations . 46

Figure 1 – Limit area for the protection against the risk of beam bypass . 12
Figure 2 – Limit of vertical and horizontal misalignment . 13
Figure 3 – Test piece at 45° . 18
Figure 4 – Test piece at 90° . 18
Figure 5 – Verifying sensing function by moving the test piece (TP) through the
detection zone near the emitter, near the receiver/retro-reflector target and at the
midpoint . 19
Figure 6 – Limit values for the effective aperture angle (EAA) . 21
Figure 7 – Determination of the minimum detection capability . 22
Figure 8 – Measuring method for EAA (direction) . 23
Figure 9 – Prism test to measure EAA of each beam . 25
Figure 10 – EAA test using prism . 26
Figure 11 – Example of optical subsystem . 27
Figure 12 – Example of SMD LED Model . 28
Figure 13 – Example of intensity distribution of emitting element . 28
Figure 14 – Example of emitter model with beams internally blocked by aperture stop . 29
Figure 15 – Example of receiving unit with off axis beam portion reflected internally on
mechanical elements . 29
Figure 16 – Example of test piece inside model of optical subsystem with passing
radiation on the receiver . 30
Figure 17 – Example of emitting unit adjusted at the limit . 31
Figure 18 – Extraneous reflection test with mirror outside of limit area . 32
Figure 19 – AOPD misalignment test . 34
Figure 20 – Light interference test – Direct method . 36
Figure 21 – Light interference test – Test set-up with incandescent light source . 37
Figure 22 – Light interference test – Test set-up with fluorescent light source . 38
Figure 23 – Light interference test – Test set-up with flashing beaconlight source . 39
Figure AA.1 – Single beam sensing device . 46
Figure AA.2 – Series connection of single beam sensing devices . 46
Figure AA.3 – Assembly of multiple beams tested individually. 46
Figure AA.4 – Example of type 2 AOPD with internal test . 47

Table 1 – Correspondences of requirements/testing and AOPD designs . 15
Table 2 – Maximum permissible angle of misalignment (in degrees) for a type 2 ESPE
depending on the dimensions of the light curtain . 32
Table 3 – Maximum permissible angle of misalignment (in degrees) for a type 3 ESPE
depending on the dimensions of the light curtain . 33
Table 4 – Maximum permissible angle of misalignment (in degrees) for a type 4 ESPE
depending on the dimensions of the light curtain . 33

– 4 – IEC 61496-2:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SAFETY OF MACHINERY –
ELECTRO-SENSITIVE PROTECTIVE EQUIPMENT –

Part 2: Particular requirements for equipment using
active opto-electronic protective devices (AOPDs)

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
...