IEC 61496-2:2013

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)

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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

– 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

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

– 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
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