Safety of machinery - Two-hand control devices - Principles for design and selection (ISO 13851:2019)

This document specifies the safety requirements of a two-hand control device (THCD) and the dependency of the output signal from the actuation by hand of the control actuating devices.
This document describes the main characteristics of THCDs for the achievement of safety and sets out combinations of functional characteristics for three types. It does not apply to devices intended to be used as enabling devices, as hold-to-run devices or as special control devices.
This document does not specify with which machines THCDs shall be used. It also does not specify which types of two-hand-control device shall be used for a specific application. Moreover, while guidance is given, it does not specify the required distance between the THCD and the danger zone (see 8.8).
This document provides requirements for design and guidance on the selection (based on a risk assessment) of THCDs including the prevention of defeat, the avoidance of faults and verification of compliance.
NOTE 1 A THCD only offers protection for the person using it.
NOTE 2 For specific machines, the suitability of a two-hand control as a suitable protective device can be defined in a type-C standard. If such a standard does not exist or is not appropriate, the risk assessment and determination of suitable protective measures is the responsibility of the manufacturer of the machine.
This document applies to all THCDs, independent of the energy used, including:
— THCDs which are fully assembled for installation;
— THCDs which are assembled by the machine manufacturer or integrator.
This document is not applicable to THCDs manufactured before the date of its publication.

Sicherheit von Maschinen - Zweihandschaltungen - Funktionelle Aspekte und Gestaltungsleitsätze (ISO 13851:2019)

Dieses Dokument legt die Sicherheitsanforderungen an eine Zweihandschaltung und die Abhängigkeit des Ausgangssignals von der manuellen Betätigung der Stellteile fest.
Dieses Dokument beschreibt die Haupteigenschaften von Zweihandschaltungen zur Erlangung von Sicherheit und führt Kombinationen von funktionalen Eigenschaften für 3 Typen auf. Dieses Dokument gilt nicht für Einrichtungen, die für die Verwendung als Zustimmungseinrichtung, Steuerungseinrichtung mit selbsttätiger Rückstellung (Tippschalter) oder als spezielle Steuereinrichtung bestimmt sind.
Dieses Dokument legt nicht fest, mit welchen Maschinen Zweihandschaltungen angewendet werden müssen. Es legt ebenfalls nicht fest, welche Typen von Zweihandschaltungen für eine bestimmte Anwendung verwendet werden müssen. Darüber hinaus legt es nicht den erforderlichen Abstand zwischen der Zweihandschaltung und dem Gefahrbereich fest (siehe 8.8), auch wenn hierzu Anleitungen gegeben werden.
Dieses Dokument stellt Anforderungen an die Gestaltung und Anleitungen zur Auswahl (als Ergebnis einer Risikobeurteilung) von Zweihandschaltungen einschließlich der Verhinderung des Umgehens, des Vermeidens von Ausfällen und der Konformitätsüberprüfung zur Verfügung.
ANMERKUNG 1   Eine Zweihandschaltung bietet nur der Person Schutz, die sie verwendet.
ANMERKUNG 2   Für spezifische Maschinen kann die Eignung einer Zweihandschaltung als geeignete Schutzeinrichtung in einer Typ-C-Norm festgelegt werden. Falls eine solche Norm nicht existiert oder nicht zutrifft, liegt die Risikobeurteilung und die Bestimmung geeigneter Schutzmaßnahmen in der Verantwortung des Maschinenherstellers.
Dieses Dokument gilt für alle Zweihandschaltungen, unabhängig von der verwendeten Energie, einschließlich:
   Zweihandschaltungen, die für die Montage komplett zusammengebaut vorliegen;
   Zweihandschaltungen, die vom Maschinenhersteller oder -integrierer zusammengebaut werden.
Dieses Dokument gilt nicht für Zweihandschaltungen, die vor dem Veröffentlichungsdatum dieses Dokuments hergestellt wurden.

Sécurité des machines - Dispositifs de commande bimanuelle - Principes de conception et de choix (ISO 13851:2019)

Le présent document spécifie les spécifications de sécurité d'un dispositif de commande bimanuelle et l'interdépendance du signal de sortie et de l'actionnement manuel des organes de service.
Le présent document décrit les principales caractéristiques des dispositifs de commande bimanuelle permettant d'assurer la sécurité, et établit des combinaisons de caractéristiques fonctionnelles pour trois types. Il ne s'applique pas aux dispositifs destinés à être utilisés comme dispositifs de validation, comme dispositifs de commande nécessitant une action maintenue, ou comme dispositifs de commande spéciaux.
Le présent document ne spécifie pas avec quelles machines les dispositifs de commande bimanuelle doivent être utilisés. Il ne spécifie pas non plus quels types de dispositifs de commande bimanuelle doivent être utilisés pour une application spécifique. Enfin, il ne spécifie pas la distance entre le dispositif de commande bimanuelle et la zone dangereuse (voir 8.8).
Le présent document fournit des exigences sur la conception et des conseils sur le choix (basés sur l'appréciation du risque) de dispositifs de commande bimanuelle y compris la vérification de conformité, et la prévention de la fraude et des défauts.
NOTE 1 Un dispositif de commande bimanuelle n'offre de protection qu'à son utilisateur.
NOTE 2 La pertinence de l'utilisation d'un dispositif de commande bimanuelle comme dispositif de protection pour les machines spécifiques peut être définie dans une norme de type C. Si une telle norme n'existe pas ou n'est pas adaptée, l'appréciation du risque et la détermination de mesures de protection adéquates relève de la responsabilité du fabricant de la machine.
Le présent document s'applique à tous les dispositifs de commande bimanuelle, indépendamment de l'énergie utilisée, y compris:
— les dispositifs de commande bimanuelle entièrement assemblés pour installation;
— les dispositifs de commande bimanuelle assemblés par le fabricant de machine ou l'intégrateur.
Le présent document n'est pas applicable aux dispositifs de commande bimanuelle fabriqués avant la date de sa publication.

Varnost strojev - Dvoročne krmilne naprave - Načela za načrtovanje in izbiro (ISO 13851:2019)

Ta evropski standard določa varnostne zahteve za dvoročne krmilne naprave in odvisnost izhodnega signala od vhodnih signalov ter opisuje glavne značilnosti dvoročnih krmilnih naprav za zagotavljanje varnosti in določa kombinacije funkcijskih značilnosti za tri tipe. Ne uporablja se za naprave, ki se uporabljajo kot vklopne, zadrževalne ali posebne krmilne naprave. Ta evropski standard podaja zahteve in smernice za načrtovanje in izbiro (na podlagi ocene tveganja) dvoročnih krmilnih naprav, vključno z njihovo oceno ter preprečevanjem odklopa in okvar. Prav tako podaja zahteve in smernice za dvoročne krmilne naprave, ki vsebujejo programirljive elektronske sisteme. Uporablja se za vse dvoročne krmilne naprave ne glede na uporabljeno energijo, vključno z dvoročnimi krmilnimi napravami, ki so ali niso sestavni del stroja, in dvoročnimi krmilnimi napravami, ki so sestavljene iz enega ali več ločenih elementov.

General Information

Status
Published
Publication Date
16-Apr-2019
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
17-Apr-2019
Completion Date
17-Apr-2019

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SLOVENSKI STANDARD
SIST EN ISO 13851:2019
01-oktober-2019
Nadomešča:
SIST EN 574:1998+A1:2008

Varnost strojev - Dvoročne krmilne naprave - Načela za načrtovanje in izbiro (ISO

13851:2019)

Safety of machinery - Two-hand control devices - Principles for design and selection

(ISO 13851:2019)
Sicherheit von Maschinen - Zweihandschaltungen - Funktionelle Aspekte und
Gestaltungsleitsätze (ISO 13851:2019)

Sécurité des machines - Dispositifs de commande bimanuelle - Principes de conception

et de choix (ISO 13851:2019)
Ta slovenski standard je istoveten z: EN ISO 13851:2019
ICS:
13.110 Varnost strojev Safety of machinery
SIST EN ISO 13851:2019 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 13851:2019
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SIST EN ISO 13851:2019
EN ISO 13851
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2019
EUROPÄISCHE NORM
ICS 13.110 Supersedes EN 574:1996+A1:2008
English Version
Safety of machinery - Two-hand control devices -
Principles for design and selection (ISO 13851:2019)

Sécurité des machines - Dispositifs de commande Sicherheit von Maschinen - Zweihandschaltungen -

bimanuelle - Principes de conception et de choix (ISO Funktionelle Aspekte und Gestaltungsleitsätze (ISO

13851:2019) 13851:2019)
This European Standard was approved by CEN on 28 February 2019.

CEN 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 CEN

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 CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 13851:2019 E

worldwide for CEN national Members.
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SIST EN ISO 13851:2019
EN ISO 13851:2019 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

Annex ZA (informative) Relationship between this European Standard and the essential

requirements of Directive 2006/42/EC aimed to be covered ........................................................ 4

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SIST EN ISO 13851:2019
EN ISO 13851:2019 (E)
European foreword

This document (EN ISO 13851:2019) has been prepared by Technical Committee ISO/TC 199 "Safety of

machinery" in collaboration with Technical Committee CEN/TC 114 “Safety of machinery” the

secretariat of which is held by DIN.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by October 2019, and conflicting national standards shall

be withdrawn at the latest by October 2019.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 574:1996+A1:2008.

This document has been prepared under a mandate given to CEN by the European Commission and the

European Free Trade Association, and supports essential requirements of EU Directive(s).

For the relationship with EU Directive(s) see informative Annex ZA, which is an integral part of this

document.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,

France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,

Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
Endorsement notice

The text of ISO 13851:2019 has been approved by CEN as EN ISO 13851:2019 without any modification.

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SIST EN ISO 13851:2019
EN ISO 13851:2019 (E)
Annex ZA
(informative)
Relationship between this European Standard and the essential
requirements of Directive 2006/42/EC aimed to be covered

This European Standard has been prepared under a Commission’s standardization request „M/396

Mandate to CEN and CENELEC for Standardisation in the field of machinery“ to provide one voluntary

means of conforming to essential requirements of Directive 2006/42/EC of the European Parliament

and of the Council of 17 May 2006 on machinery, and amending Directive 95/16/EC (recast).

Once this standard is cited in the Official Journal of the European Union under that Directive,

compliance with the normative clauses of this standard given in Table ZA.1 confers, within the limits of

the scope of this standard, a presumption of conformity with the corresponding essential requirements

of that Directive and associated EFTA regulations.

Table ZA.1 — Correspondence between this European Standard and Annex I of Directive

2006/42/EC
Essential Requirement of
Clause(s)/subclause(s) of this EN Remarks/Notes
Directive
Essential Requirement 1.2.1 4.1 and 4.2 None
Essential Requirement 1.2.2 7.1, 7.2, 7.3, 7.4, 7.5, 7.6 and 7.7 None
Essential Requirement 1.2.3 5.1 5.2, 5.3, 5.4, 5.5 and 5.8. None
Essential Requirement 1.2.4 6.2 None

WARNING 1 — Presumption of conformity stays valid only as long as a reference to this European

Standard is maintained in the list published in the Official Journal of the European Union. Users of this

standard should consult frequently the latest list published in the Official Journal of the European

Union.

WARNING 2 — Other Union legislation may be applicable to the products falling within the scope of

this standard.
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SIST EN ISO 13851:2019
INTERNATIONAL ISO
STANDARD 13851
Second edition
2019-03
Safety of machinery — Two-hand
control devices — Principles for
design and selection
Sécurité des machines — Dispositifs de commande bimanuelle —
Principes de conception et de choix
Reference number
ISO 13851:2019(E)
ISO 2019
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SIST EN ISO 13851:2019
ISO 13851:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
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SIST EN ISO 13851:2019
ISO 13851:2019(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

Introduction ................................................................................................................................................................................................................................vi

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 THCD selection and THCD types........................................................................................................................................................... 3

4.1 Selection........................................................................................................................................................................................................ 3

4.2 Types of THCD ......................................................................................................................................................................................... 4

5 Requirements for the design of two-hand control devices ....................................................................................... 4

5.1 General ........................................................................................................................................................................................................... 4

5.2 Use of both hands (simultaneous actuation) ................................................................................................................ 4

5.3 Relationship between actuation by hand and output signal(s) .................................................................... 4

5.4 Cessation of the output signal .................................................................................................................................................... 5

5.5 Prevention of accidental operation ....................................................................................................................................... 5

5.6 Prevention of defeat ........................................................................................................................................................................... 5

5.7 Re-initiation of the output signal ............................................................................................................................................ 5

5.8 Synchronous actuation .................................................................................................................................................................... 5

6 Two hand control safety functions .................................................................................................................................................... 6

6.1 Prevention of unexpected start-up ........................................................................................................................................ 6

6.2 Releasing of actuators ....................................................................................................................................................................... 6

6.3 Synchronous actuation .................................................................................................................................................................... 6

7 Prevention of accidental actuation and of defeat ............................................................................................................... 6

7.1 Common considerations ................................................................................................................................................................. 6

7.2 Prevention of defeat using one hand ................................................................................................................................... 7

7.3 Prevention of defeat using the hand and elbow of the same arm ............................................................... 7

7.4 Prevention of defeat using the forearm(s) or elbow(s) ....................................................................................... 7

7.5 Prevention of defeat using one hand and any other part of the body .................................................... 7

7.6 Measures to prevent blocking of control actuating device(s) ........................................................................ 8

7.7 Accidental actuation ........................................................................................................................................................................... 8

8 General requirements ..................................................................................................................................................................................... 8

8.1 Ergonomic requirements ............................................................................................................................................................... 8

8.2 Operating conditions and environmental influences ............................................................................................ 8

8.3 Enclosures ................................................................................................................................................................................................... 9

8.4 Selection, design and installation of control actuating devices .................................................................... 9

8.5 Prevention of unintended output signals by acceleration forces ................................................................ 9

8.6 Unintended operation of hand-held machines ............................................................................................................ 9

8.7 Relocatable THCDs ...........................................................................................................................................................................10

8.8 Safety distance......................................................................................................................................................................................10

9 Verification and validation .....................................................................................................................................................................11

9.1 General requirements for verification and validation........................................................................................11

9.2 Visual inspection ................................................................................................................................................................................12

9.3 Performance test ................................................................................................................................................................................12

9.4 Measurement .........................................................................................................................................................................................12

9.5 Prevention of defeat ........................................................................................................................................................................12

10 Marking .......................................................................................................................................................................................................................12

11 Information for installation, use and maintenance ......................................................................................................13

11.1 Information for use ..........................................................................................................................................................................13

11.2 Installation instructions ...............................................................................................................................................................13

11.3 Operating instructions ..................................................................................................................................................................14

11.4 Maintenance instructions ...........................................................................................................................................................14

© ISO 2019 – All rights reserved iii
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SIST EN ISO 13851:2019
ISO 13851:2019(E)

Annex A (normative) Measurement test for the prevention of defeat ...........................................................................15

Bibliography .............................................................................................................................................................................................................................21

iv © ISO 2019 – All rights reserved
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SIST EN ISO 13851:2019
ISO 13851:2019(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso

.org/iso/foreword .html.

This document was prepared by Technical Committee ISO/TC 199, Safety of machinery.

This second edition cancels and replaces the first edition (ISO 13851:2002), which has been technically

revised.

The main change compared to the previous edition is the adaptation of the safety-related parts of the

control system from the categories to the Performance Level (PL) (according to ISO 13849-1) or SIL

with the allocated HTF (according to IEC 62061).

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/members .html.
© ISO 2019 – All rights reserved v
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SIST EN ISO 13851:2019
ISO 13851:2019(E)
Introduction
The structure of safety standards in the field of machinery is as follows:

a) type-A standards (basic safety standards) giving basic concepts, principles for design and general

aspects that can be applied to all machinery;

b) type-B standards (generic safety standards) dealing with one safety aspect or one or more type(s)

of safeguard that can be used across a wide range of machinery:

— type-B1 standards on particular safety aspects (e.g. safety distances, surface temperature, noise);

— type-B2 standards on safeguards (e.g. two-hand controls, interlocking devices, pressure

sensitive devices, guards);

c) type-C standards (machine safety standards) dealing with detailed safety requirements for a

particular machine or group of machines.
This document is a type-B2 standard as stated in ISO 12100.

This document is of relevance, in particular, for the following stakeholder groups representing the

market players with regard to machinery safety:
— machine manufacturers (small, medium and large enterprises);

— health and safety bodies (regulators, accident prevention organizations, market surveillance etc.).

Others can be affected by the level of machinery safety achieved with the means of the document by the

above-mentioned stakeholder groups:
— machine users/employers (small, medium and large enterprises);

— machine users/employees (e.g. trade unions, organizations for people with special needs);

— service providers, e.g. for maintenance (small, medium and large enterprises);
— consumers (in case of machinery intended for use by consumers).

The above-mentioned stakeholder groups have been given the possibility to participate at the drafting

process of this document.

In addition, this document is intended for standardization bodies elaborating type-C standards.

The requirements of this document can be supplemented or modified by a type-C standard.

For machines that are covered by the scope of a type-C standard and have been designed and built

according to the requirements of that standard, the requirements of that type-C standard take

precedence.

A two-hand control device (THCD) is a protective device. It provides protection for the operator against

reaching danger zones during hazardous situations by locating the control actuating devices in a

specific position and distance from the danger zone(s).

The selection of a THCD as an appropriate safety device depends upon the risk assessment made by

designers, standard makers and others in accordance with ISO 12100.

The definition of a THCD is given in 3.1 and takes precedence over the definition given in ISO 12100.

In some arrangements, enabling devices (see ISO 12100) and/or hold-to-run devices (see ISO 12100)

may comply with the definition of a THCD in this document. Additionally, some special control devices

— such as some crane controls — require the use of two hands and can comply with the definition of a

THCD in this document.
vi © ISO 2019 – All rights reserved
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SIST EN ISO 13851:2019
INTERNATIONAL STANDARD ISO 13851:2019(E)
Safety of machinery — Two-hand control devices —
Principles for design and selection
1 Scope

This document specifies the safety requirements of a two-hand control device (THCD) and the

dependency of the output signal from the actuation by hand of the control actuating devices.

This document describes the main characteristics of THCDs for the achievement of safety and sets out

combinations of functional characteristics for three types. It does not apply to devices intended to be

used as enabling devices, as hold-to-run devices or as special control devices.

This document does not specify with which machines THCDs shall be used. It also does not specify which

types of two-hand-control device shall be used for a specific application. Moreover, while guidance is

given, it does not specify the required distance between the THCD and the danger zone (see 8.8).

This document provides requirements for design and guidance on the selection (based on a risk

assessment) of THCDs including the prevention of defeat, the avoidance of faults and verification of

compliance.
NOTE 1 A THCD only offers protection for the person using it.

NOTE 2 For specific machines, the suitability of a two-hand control as a suitable protective device can be

defined in a type-C standard. If such a standard does not exist or is not appropriate, the risk assessment and

determination of suitable protective measures is the responsibility of the manufacturer of the machine.

This document applies to all THCDs, independent of the energy used, including:
— THCDs which are fully assembled for installation;
— THCDs which are assembled by the machine manufacturer or integrator.

This document is not applicable to THCDs manufactured before the date of its publication.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 12100:2010, Safety of machinery — General principles for design — Risk assessment and risk reduction

ISO 13849-1:2015, Safety of machinery — Safety-related parts of control systems — Part 1: General

principles for design

ISO 13849-2:2012, Safety of machinery — Safety-related parts of control systems — Part 2: Validation

ISO 13855:2010, Safety of machinery — Positioning of safeguards with respect to the approach speeds of

parts of the human body

IEC 62061:2005+AMD1: 2012+AMD2: 2015, Safety of machinery — Functional safety of safety-related

electrical, electronic and programmable electronic control systems
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 12100 and the following apply.

© ISO 2019 – All rights reserved 1
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SIST EN ISO 13851:2019
ISO 13851:2019(E)

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
two-hand control device
THCD

device which requires simultaneous actuation by the use of both hands in order to initiate and to

maintain hazardous machine functions, thus providing protective measure only for the person who

actuates it
Note 1 to entry: See Figure 1.
Key
1 actuation by hands 5 signal processor(s)
2 THCD 6 output signal(s)
3 control actuating devices (actuators) 7 logic unit
4 signal converter(s)
Figure 1 — Schematic representation of a THCD

Note 2 to entry: Inclusion of Figure 1 is a modification of ISO 12100:2010, 3.28.4.

3.2
input signal
externally actuated signal applied by hand to a control actuating device (3.3)
Note 1 to entry: See Figure 1.
3.3
control actuating device
actuator

component of the THCD (3.1) which senses an input signal (3.2) from one hand and transmits it to a

signal converter (3.6)
Note 1 to entry: See Figure 1.
2 © ISO 2019 – All rights reserved
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SIST EN ISO 13851:2019
ISO 13851:2019(E)
3.4
simultaneous actuation

continuing actuation of both control actuating devices (3.3) during the same time period, whatever the

time lag is between the start of one input signal (3.2) and the start of the other

Note 1 to entry: See Figure 2.
3.5
synchronous actuation
particular case of simultaneous actuation (3.4) within a defined time period
Note 1 to entry: See also 5.8.
3.6
signal converter

component of the THCD (3.1) which receives an input signal (3.2) from a control actuating device (3.3)

and which transmits and/or converts this signal into a form acceptable to the signal processor (3.7)

Note 1 to entry: See Figure 1.
3.7
signal processor

part of the THCD (3.1) which generates the output signal (3.8) as a consequence of the actuation by hands

Note 1 to entry: See Figure 1.
3.8
output signal
signal generated by the THCD (3.1) intended to be processed by a control system
Note 1 to entry: See Figure 1.
3.9
response time

time between the release of a control actuating device (3.3) and the cessation of the output signal (3.8)

Note 1 to entry: See also 8.8.
3.10
relocatable THCD

device which can be moved and used in more than one definable position relative to the danger zone of

the machine with which it is interfaced
4 THCD selection and THCD types
4.1 Selection

The selection of a THCD as a protective device depends upon the risk assessment (e.g. made by machine

manufacturer and integrators, designers and standards requirements).
The selection and the design of the type (see Table 1) of the THCD depend on
— the hazard(s) present;
— the risk assessment in accordance with ISO 12100;
— experience in use of the technology;

— other factors, which shall be specified for each application [e.g. the prevention of accidental actuati

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