SIST EN 61496-2:2014

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

This clause of Part 1 is replaced by the following: This part of IEC 61496 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 may include optional safetyrelated functions, the requirements for which are given in Annex A of IEC 61946-1:2012 and of this part. This part of IEC 61496 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 part are AOPDs employing radiation at wavelengths outside the range 400 nm to 1500 nm. This part of IEC 61496 may 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 may be necessary, for example, when the materials that are to be recognized by the sensing function have different properties from those of persons. This part does of IEC 61496 not deal with EMC emission requirements.

Sicherheit von Maschinen - Berührungslos wirkende Schutzeinrichtungen - Teil 2: Besondere Anforderungen an Einrichtungen, welche nach dem aktiven opto-elektronischen Prinzip arbeiten

Sécurité des machines - Equipement de protection électrosensible - Partie 2: Exigences particulières à un équipement utilisant des dispositifs protecteurs optoélectroniques actifs (AOPD)

La CEI 61496-2:2013 définit les exigences de conception, de construction et d'essai d'équipements de protection électro-sensibles (ESPE) conçus spécialement pour détecter des personnes, comme partie d'un système relatif à la sécurité, utilisant des appareils 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 optionnelles; les exigences pour ces fonctions sont données à l'Annexe A de la CEI 61946-1:2012 et de la présente Partie. Cette troisième édition annule et remplace la deuxième édition parue en 2006. Elle constitue une révision technique et inclut les modifications techniques majeures suivantes:  - Les exigences ont été corrigées et sont plus faciles à comprendre.  - Les méthodes d'essai ont été révisées pour être plus faciles à réaliser et pour améliorer la répétabilité.  - Des recommandations sont fournies pour l'évaluation et la vérification des appareils protecteurs optoélectroniques actifs (AOPD) utilisant des techniques de conception pour lesquelles les méthodes d'essai de la présente partie ne sont pas suffisantes.

Varnost strojev - Električno občutljiva zaščitna oprema - 2. del: Posebne zahteve za opremo, ki uporablja aktivne optoelektronske zaščitne elemente (IEC 61496-2:2013)

To točko 1. dela nadomešča naslednje besedilo: Ta del standarda IEC 61496 navaja zahteve za načrtovanje, sestavo in preskušanje električno občutljive zaščitne opreme (ESPE), posebej zasnovane za zaznavanje oseb kot del varnostnega sistema, ki za zaznavanje uporablja optoelektronske zaščitne naprave (AOPD). Posebna pozornost je namenjena lastnostim, ki omogočajo ustrezno opravljanje varnostnih nalog. Električno občutljiva zaščitna oprema lahko vključuje izbirne funkcije, povezane z varnostjo, zahteve za katere so podane v dodatku A standarda IEC 61946-1:2012 in tega dela. Ta del standarda IEC 61496 ne navaja dimenzij ali oblike zaznavnega območja in njegove dispozicije v povezavi z nevarnimi deli za katero koli aplikacijo, niti ne opredeljuje, kaj je nevarno stanje za kateri koli stroj. Omejuje se na delovanje električno občutljive zaščitne opreme in njene povezave s strojem. Iz tega dela so izključene optoelektronske zaščitne naprave, ki uporabljajo sevanje pri valovnih dolžinah zunaj območja 400 nm do 1500 nm. Ta del standarda IEC 61496 se lahko uporablja tudi za primere rabe opreme, pri kateri cilj ni zaščita oseb, kot je varnost strojev ali izdelkov pred mehanskimi poškodbami. V teh primerih so morda potrebne dodatne zahteve, npr. ko imajo materiali, ki jih morajo funkcije za zaznavanje prepoznati, drugačne lastnosti kot osebe. Ta del standarda IEC 61496 ne obravnava zahtev glede oddajanja motenj v zvezi z elektromagnetno združljivostjo.

General Information

• Status: Withdrawn
• Publication Date: 14-May-2014
• Withdrawal Date: 30-May-2023
• ICS: 13.110 - Safety of machinery
• ICS: 31.260 - Optoelectronics. Laser equipment
• Technical Committee: MOV - Measuring equipment for electromagnetic quantities
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 30-May-2023
• Due Date: 22-Jun-2023
• Completion Date: 31-May-2023
• Ref Project: EN 61496-2:2013 - Safety of machinery - Electro-sensitive protective equipment - Part 2: Particular requirements for equipment using active opto-electronic protective devices (AOPDs)

Relations

• Replaced By: SIST EN 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)
• Effective Date: 29-Sep-2020
• Revised: SIST-TS CLC/TS 61496-2:2006 - Safety of machinery - Electro-sensitive protective equipment -- Part 2: Particular requirements for equipment using active opto-electronic protective devices (AOPDs)
• Effective Date: 06-May-2014

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 61496-2:2014
01-junij-2014
9DUQRVWVWURMHY(OHNWULþQRREþXWOMLYD]DãþLWQDRSUHPDGHO3RVHEQH]DKWHYH
]DRSUHPRNLXSRUDEOMDDNWLYQHRSWRHOHNWURQVNH]DãþLWQHHOHPHQWH,(&

Safety of machinery - Electro-sensitive protective equipment - Part 2: Particular
requirements for equipment using active opto-electronic protective devices (AOPDs)
Sicherheit von Maschinen - Berührungslos wirkende Schutzeinrichtungen - Teil 2:
Besondere Anforderungen an Einrichtungen, welche nach dem aktiven opto-
elektronischen Prinzip arbeiten
Sécurité des machines - Equipement de protection électrosensible - Partie 2: Exigences
particulières à un équipement utilisant des dispositifs protecteurs optoélectroniques actifs
(AOPD)
Ta slovenski standard je istoveten z: EN 61496-2:2013
ICS:
13.110 Varnost strojev Safety of machinery
31.260 Optoelektronika, laserska Optoelectronics. Laser
oprema equipment
SIST EN 61496-2:2014 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST EN 61496-2:2014

---------------------- Page: 2 ----------------------

SIST EN 61496-2:2014

EUROPEAN STANDARD
EN 61496-2

NORME EUROPÉENNE
December 2013
EUROPÄISCHE NORM

ICS 13.110; 29.260.99 Supersedes CLC/TS 61496-2:2006


English version


Safety of machinery -
Electro-sensitive protective equipment -
Part 2: Particular requirements for equipment
using active opto-electronic protective devices (AOPDs)
(IEC 61496-2:2013)


Sécurité des machines -  Sicherheit von Maschinen -
Equipements de protection électro-sensibles - Berührungslos wirkende Schutzeinrichtungen -
Partie 2: Exigences particulières à un Teil 2: Besondere Anforderungen an
équipement utilisant des appareils protecteurs Einrichtungen, welche nach dem aktiven opto-
optoélectroniques actifs (AOPD) elektronischen Prinzip arbeiten
(CEI 61496-2:2013) (IEC 61496-2:2013)





This European Standard was approved by CENELEC on 2013-07-12. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the CEN-CENELEC Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the CEN-CENELEC Management Centre has the same status as the official versions.

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

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

CEN-CENELEC Management Centre: Avenue Marnix 17, B - 1000 Brussels


© 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61496-2:2013 E

---------------------- Page: 3 ----------------------

SIST EN 61496-2:2014
EN 61496-2:2013 - 2 -
Foreword
The text of document 44/651/CDV, future edition 3 of IEC 61496-2, prepared by IEC/TC 44 "Safety of
machinery - Electrotechnical aspects" was submitted to the IEC-CENELEC parallel vote and approved
by CENELEC as EN 61496-2:2013.
The following dates are fixed:
– latest date by which the document has to be implemented at (dop) 2014-06-13
national level by publication of an identical national
standard or by endorsement
– latest date by which the national standards conflicting with (dow) 2016-07-12
the document have to be withdrawn

This document supersedes CLC/TS 61496-2:2006.
EN 61496-2:2013 includes the following significant technical changes with respect to
CLC/TS 61496-2:2006:
– requirements have been corrected and made easier to understand;
– test procedures have been revised to make them easier to perform and to improve repeatability;
– guidance is provided for the evaluation and verification of AOPDs using design techniques for
which the test procedures of this part are not sufficient.
This standard is to be used in conjunction with EN 61496-1:2013.
This part supplements or modifies the corresponding clauses in EN 61496-1.
Where a particular clause or subclause of Part 1 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 Part 1 is adapted accordingly.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
Endorsement notice
The text of the International Standard IEC 61496-2:2013 was approved by CENELEC as a European
Standard without any modification.

---------------------- Page: 4 ----------------------

SIST EN 61496-2:2014
- 3 - EN 61496-2:2013
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE  When an international publication has been modified by common modifications, indicated by (mod), the
relevant EN/HD applies.

Publication Year Title EN/HD Year
IEC 60825-1 2007 Safety of laser products - EN 60825-1 2007
Part 1: Equipment classification and
requirements
IEC 61496-1 2012 Safety of machinery - Electro-sensitive EN 61496-1 2013
protective equipment
Part 1: General requirements and tests
IEC 62471 - Photobiological safety of lamps and lamp EN 62471 -
systems
ISO 13855 - Safety of machinery - Positioning of EN ISO 13855 -
protective equipment with respect to the
approach speeds of parts of the human
body
- - High-visibility warning clothing for EN 471 2003
professional use - Test methods and
requirements

---------------------- Page: 5 ----------------------

SIST EN 61496-2:2014

---------------------- Page: 6 ----------------------

SIST EN 61496-2:2014




IEC 61496-2

®


Edition 3.0 2013-01




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 électro-sensibles –

Partie 2: Exigences particulières à un équipement utilisant des appareils


protecteurs optoélectroniques actifs (AOPD)













INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE

PRICE CODE
INTERNATIONALE

CODE PRIX XA


ICS 13.110; 29.260.99 ISBN 978-2-83220-587-7



Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

---------------------- Page: 7 ----------------------

SIST EN 61496-2:2014
– 2 – 61496-2 © IEC:2013
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Functional, design and environmental requirements . 9
4.1 Functional requirements . 9
4.2 Design requirements . 11
4.3 Environmental requirements . 14
5 Testing . 14
5.1 General . 14
5.2 Functional tests . 17
5.4 Environmental tests . 34
6 Marking for identification and safe use. 42
6.1 General . 42
7 Accompanying documents . 42
Annex A (normative) Optional functions of the ESPE . 44
Annex B (normative) Catalogue of single faults affecting the electrical equipment of
the ESPE, to be applied as specified in 5.3 . 48
Annex AA (informative) Type 2 AOPD periodic test configurations . 49
Bibliography . 51
Index . 52

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° . 19
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 – Design calculations for a wedge prism . 27
Figure 12 – Example of optical subsystem: Emitter on left – Receiver on right . 27
Figure 13 – Example of SMD LED Model . 28
Figure 14 – Example of intensity distribution of emitting element . 28
Figure 15 – Example of emitter model with beams internally blocked by aperture stop . 28
Figure 16 – Example of receiving unit with off axis beam portion reflected internally on
mechanical elements . 29
Figure 17 – Example of test piece inside model of optical subsystem with passing
radiation on the receiver . 30

---------------------- Page: 8 ----------------------

SIST EN 61496-2:2014
61496-2 © IEC:2013 – 3 –
Figure 18 – Example of emitting unit adjusted at the limit . 31
Figure 19 – Extraneous reflection test with mirror outside of limit area . 32
Figure 20 – AOPD misalignment test . 33
Figure 21 – Light interference test – Direct method . 35
Figure 22 – Light interference test – Test set-up with incandescent light source . 36
Figure 23 – Light interference test – Test set-up with fluorescent light source . 37
Figure 24 – Light interference test – Test set-up with flashing beacon light source . 38
Figure 25 – Light interference test – Test set-up with stroboscopic light source . 39
Figure AA.1 – Single beam sensing device . 49
Figure AA.2 – Series connection of single beam sensing devices . 49
Figure AA.3 – Assembly of multiple beams tested individually. 49
Figure AA.4 – Example of type 2 AOPD with internal test . 50

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 4 ESPE
depending on the dimensions of the light curtain . 32

---------------------- Page: 9 ----------------------

SIST EN 61496-2:2014
– 4 – 61496-2 © IEC:2013
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 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.
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 third edition cancels and replaces the second edition published in 2006. It constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:

a) Requirements have been corrected and made easier to understand.
b) Test procedures have been revised to make them easier to perform and to improve
repeatability.
c) Guidance is provided for the evaluation and verification of AOPDs using design
techniques for which the test procedures of this part are not sufficient.

---------------------- Page: 10 ----------------------

SIST EN 61496-2:2014
61496-2 © IEC:2013 – 5 –
This standard has the status of a product family standard and may 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 61496-1:2012.
This part supplements or modifies the corresponding clauses in IEC 61496-1.
Where a particular clause or subclause of Part 1 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 Part 1 is adapted accordingly.
The text of this standard is based on the following documents:
CDV Report on voting
44/651/CDV 44/670/RVC

Full information on the voting for the approval of this standard 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.
A list of all parts in the IEC 61496 series, published under the general title Safety of
machinery – Electro-sensitive protective equipment can be found on the IEC website.
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.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.

---------------------- Page: 11 ----------------------

SIST EN 61496-2:2014
– 6 – 61496-2 © IEC:2013
INTRODUCTION
Electro-sensitive protective equipment (ESPE) is applied to machinery that presents a risk of
personal injury. It provides protection by causing the machine to revert to a safe condition
before a person can be placed in a hazardous situation.
This part of IEC 61496 provides particular requirements for the design, construction and
testing of electro-sensitive protective equipment (ESPE) for the safeguarding of machinery,
employing active opto-electronic protective devices (AOPDs) for the sensing function.
Each type of machine presents its own particular hazards, and it is not the purpose of this
standard to recommend the manner of application of the ESPE to any particular machine. The
application of the ESPE should be a matter for agreement between the equipment supplier,
the machine user and the enforcing authority; in this context, attention is drawn to the relevant
guidance established internationally, for example, ISO 12100.
Due to the complexity of the technology of ESPEs there are many issues that are highly
dependent on analysis and expertise in specific test and measurement techniques. In order to
provide a high level of confidence, independent review by relevant expertise is recommended.

---------------------- Page: 12 ----------------------

SIST EN 61496-2:2014
61496-2 © IEC:2013 – 7 –
SAFETY OF MACHINERY –
ELECTRO-SENSITIVE PROTECTIVE EQUIPMENT –

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



1 Scope
This clause of Part 1 is replaced by the following:
This part of IEC 61496 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 may include optional safety-
related functions, the requirements for which are given in Annex A of IEC 61946-1:2012 and
of this part.
This part of IEC 61496 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 part are AOPDs employing radiation at wavelengths outside the range
400 nm to 1500 nm.
This part of IEC 61496 may 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 may be necessary, for example, when the
materials that are to be recognized by the sensing function have different properties from
those of persons.
This part does of IEC 61496 not deal with EMC emission requirements.
2 Normative references
This clause of Part 1 is applicable except as follows:
Additional references:
IEC 60825-1:2007, Safety of laser products – Part 1: Equipment classification and
requirements
IEC 61496-1:2012, Safety of machinery – Electro-sensitive protective equipment – Part 1:
General requirements and tests
IEC 62471, Photobiological safety of lamps and lamp systems
ISO 13855, Safety of machinery – Positioning of safeguards with respect to the approach
speeds of parts of the human body
EN 471:2003, High-visibility warning clothing for professional use – Test methods and
requirements.

---------------------- Page: 13 ----------------------

SIST EN 61496-2:2014
– 8 – 61496-2 © IEC:2013
3 Terms and definitions
NOTE At the end of this standard there is an index which lists, in alphabetical order, the terms and acronyms
defined in Clause 3 and indicates where they are used in the text.
This clause of Part 1 is applicable except as follows:
Additional definitions:
3.201
active opto-electronic protective device
AOPD
device whose sensing function is performed by opto-electronic emitting and receiving
elements detecting the interruption of optical radiations generated, within the device, by an
opaque object present in the specified detection zone (or for a light beam device, on the axis
of the light beam)
Note 1 to entry: This note applies to the French language only.
3.202
beam centre-line
optical path joining the optical centre of an emitting element to the optical centre of the
corresponding receiving element that is intended to respond to light from that emitting
element during normal operation
Note 1 to entry: The optical axis of a light beam is not always on the beam centre-line.
Note 2 to entry: Physical displacement of the beam centre-line may occur as a consequence of normal operation
(for example, by the use of a motor-driven mirror).
Note 3 to entry: For an AOPD that operates on a retro-reflective technique, the optical path is defined by the
retro-reflector target together with the emitting and receiving elements.
3.203
effective aperture angle
EAA
maximum angle of deviation from the optical alignment of the emitting element(s) and the
receiving element(s) within which the AOPD continues in normal operation
Note 1 to entry: This note applies to the French language only.
3.204
light beam device
AOPD comprising one or more emitting element(s) and corresponding receiving element(s),
where a detection zone is not specified by the supplier
3.205
light curtain
AOPD comprising an integrated assembly of one or more emitting element(s) and one or more
receiving element(s) forming a detection zone with a detection capability specified by the
supplier
Note 1 to entry: A light curtain with a large detection capability is sometimes referred to as a light grid.
3.206
test piece
opaque cylindrical element used to verify the detection capability of the AOPD
3.207
geometrically restricted optical design
GROD
AOPD using an optic design where

---------------------- Page: 14 ----------------------

SIST EN 61496-2:2014
61496-2 © IEC:2013 – 9 –
– the effective aperture angle (EAA) of each emitting and each receiving element does not
exceed the values given in Figure 6 and
– the axes of the optical beams are parallel and
– side lobes are minimized and
– the spacing between beam centre-lines is uniform and
– the value of detection capability is based on the complete obscuration of at least one
beam for any and all positions of the test piece within the detection zone (see Figure 7).
Note 1 to entry: This note applies to the French language only.
Replacement:
3.3
detection capability
dimension representing the diameter of the test piece which:
– for a light curtain, will actuate the sensing device when placed in the detection zone;
– for a single light beam device, will actuate the sensing device when placed in the beam
centre-line;
– for a multiple light beam device, will actuate the sensing device when placed in any beam
centre-line
Note 1 to entry: The term “detection capability” can also be used to mean the ability to detect a test piece of the
specified diameter.
4 Functional, design and environmental requirements
This clause of Part 1 is applicable except as follows:
4.1 Functional requirements
4.1.2 Sensing function

Replacement:
4.1.2.1 General requirements
The sensing function shall be effective over the detection zone specified by the supplier. No
adjustment of the detection zone, detection capability or blanking function shall be possible
without the use of a key, key-word or tool.
The sensing device of a light curtain shall be actuated and the OSSD(s) shall go to the OFF-
state when a test piece in accordance with 4.2.13 is placed anywhere within the detection
zone either static (at any angle) or moving (with the axis of the cylinder normal to the plane of
the detection zone), at any speed between 0 m/s and 1,6 m/s.
The sensing device of a light beam device shall be actuated and the OSSD(s) shall go to the
OFF-state when a test piece in accordance with 4.2.13 is present in the beam centre-line, at
any point throughout the operating distance, with the axis of the cylinder normal to the axis of
the beam.
NOTE The purpose of this requirement is to ensure that the OSSD(s) go to the OFF-state when a person or part
of a person passes through
...