SIST EN ISO 13856-2:2013

Safety of machinery - Pressure-sensitive protective devices - Part 2: General principles for design and testing of pressure-sensitive edges and pressure-sensitive bars (ISO 13856-2:2013)

ISO 13856-2:2012 establishes general principles and specifies requirements for the design and testing of pressure-sensitive edges and pressure-sensitive bars used as safeguards and not as actuating devices for normal operation.
ISO 13856-2:2012 is applicable to pressure-sensitive edges and pressure-sensitive bars, with or without an external reset facility, used to detect persons or body parts that can be exposed to hazards such as those caused by the moving parts of machines.
It is not applicable to determining the suitability of a pressure-sensitive edge or pressure-sensitive bar for a particular safeguarding application, selection of an appropriate performance level for safety-related parts of control systems (SRP/CSs) other than to give minimum values,dimensioning or configuring of the effective sensing area of pressure-sensitive edges or pressure-sensitive bars in relation to any particular application or to stopping devices according to IEC 60204-1 used only for normal operation, including emergency stopping of machinery.

Sicherheit von Maschinen - Druckempfindliche Schutzeinrichtungen - Teil 2: Allgemeine Leitsätze für die Gestaltung und Prüfung von Schaltleisten und Schaltstangen (ISO 13856-2:2013)

Dieser Teil von ISO 13856 stellt allgemeine Leitsätze auf und legt Anforderungen an die Gestaltung und Prüfung von Schaltleisten und Schaltstangen fest, die als Schutzeinrichtungen und nicht als Betätigungseinrichtungen für den Normalbetrieb eingesetzt werden.
Dieser Teil von ISO 13856 gilt für Schaltleisten und Schaltstangen mit oder ohne Rückstelleinrichtung, die verwendet werden, um Personen bzw. deren Körperteile zu erkennen, die Gefährdungen ausgesetzt sein können, wie jenen die durch sich bewegende Teile von Maschinen bedingt sind.
Das Dokument gilt nicht,
-  um die Eignung einer Schaltleiste bzw. Schaltstange für eine bestimmte Anwendung technischer Schutzmaßnahmen festzustellen;
-  um neben der Angabe von Mindestwerten einen entsprechenden Performance Level für sicherheitsbezogene Teile von Steuerungen (SRP/CSs) auszuwählen;
-  für die Maße bzw. die Anordnungsform der wirksamen Betätigungsfläche von Schaltleisten bzw. Schaltstangen im Hinblick auf eine bestimmte Anwendung;
-  für Stoppeinrichtungen ("Einrichtungen zum Stillsetzen") nach IEC 60204-1, die nur für den Normalbetrieb, einschließlich Not-Halt, von Maschinen verwendet werden.
Anforderungen an die "Informationen", die vom Hersteller zur Verfügung gestellt werden müssen, werden aufgeführt, um die Auswahl einer geeigneten Schaltleiste bzw. Schaltstange und deren Einsatz zu unterstützen.
Zusätzliche Anforderungen können dort erforderlich sein, wo Schaltleisten bzw. Schaltstangen an Orten zum Einsatz kommen, die für alte oder behinderte Menschen oder Kinder zugänglich sind.

Sécurité des machines - Dispositifs de protection sensibles à la pression - Partie 2: Principes généraux de conception et d'essai des bords et barres sensibles à la pression (ISO 13856-2:2013)

L'ISO 13856-2:2013 établit les principes généraux et spécifie les exigences relatives à la conception et aux essais des bords et barres sensibles à la pression utilisés comme des moyens de protection et non comme des dispositifs d'actionnement pour le fonctionnement normal.
L'ISO 13856-2:2013 est applicable aux bords et barres sensibles à la pression, avec ou sans dispositif de réarmement externe, utilisés pour détecter des personnes ou des parties de corps de personnes qui sont exposées à des dangers tels que ceux causés par des éléments mobiles de machines.
L'ISO 13856-2:2013 n'est pas applicable:
à la détermination de l'aptitude d'un bord sensible à la pression ou d'une barre sensible à la pression à protéger pour une application de protection particulière;
au choix d'un niveau de performance (PL) approprié pour les parties des systèmes de commande relatives à la sécurité (SRP/CS) sauf à fournir des valeurs minimales;
aux dimensions ou à la configuration de la zone sensible effective des bords ou barres sensibles à la pression pour une application particulière;
aux dispositifs d'arrêt conformes à la CEI 60204-1 utilisés uniquement pour le fonctionnement normal des machines, y compris l'arrêt d'urgence.
Les exigences relatives aux informations à fournir par le fabricant sont données comme aide au choix d'un bord ou d'une barre sensible approprié(e) et adapté(e) à son application.
Des exigences supplémentaires peuvent être nécessaires lorsque les bords ou barres sensibles à la pression sont utilisés à des emplacements accessibles aux personnes âgées ou handicapées ou aux enfants.

Varnost strojev - Varovalne naprave, občutljive na tlak - 2. del: Splošna načela načrtovanja in preskušanja robov in letev, občutljivih na tlak (ISO 13856-2:2013)

Ta del standarda ISO 13856 vzpostavlja splošna načela in določa zahteve za načrtovanje in preskušanje robov in letev, občutljivih na tlak, ki se uporabljajo kot varovala in ne kot aktivacijske naprave za normalno delovanje. Ta del standarda ISO 13856 se uporablja za robove in letve, občutljive na tlak, z zunanjo funkcijo ponastavitve ali brez nje, ki se uporabljajo za zaznavanje oseb ali delov telesa, ki so lahko izpostavljeni nevarnostim, npr. zaradi gibljivih delov strojev. Ne uporablja se za – ugotavljanje primernosti roba ali letve, občutljive na tlak, za posamezno vrsto uporabe za varovanje, – izbiro ustrezne ravni učinkovitosti varnostnih delov nadzornih sistemov (SRP/CS), razen določanja minimalnih vrednosti, – dimenzioniranje ali konfiguriranje efektivnega območja zaznavanja robov in letev, občutljivih na tlak, v zvezi s posamezno vrsto uporabe, – naprave za zaustavljanje iz standarda IEC 60204-1, ki se uporabljajo samo za normalno delovanje, vključno z zaustavitvijo strojev v sili. Zahteve za informacije, ki jih mora priskrbeti proizvajalec, so podane kot pomoč pri izbiri ustreznega roba ali letve, občutljive na tlak, in njune uporabe. Dodatne zahteve so lahko potrebne, če se robovi ali letve, občutljivi na tlak, uporabljajo na mestih, do katerih imajo dostop ostareli, invalidi ali otroci.

General Information

• Status: Published
• Public Enquiry End Date: 19-Jan-2012
• Publication Date: 20-Oct-2013
• ICS: 13.110 - Safety of machinery
• Technical Committee: VSN - Safety of machinery
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 18-Oct-2013
• Due Date: 23-Dec-2013
• Completion Date: 21-Oct-2013
• Directive: 2006/42/EC - 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)
• Mandate: M/079 - Mandate to CEN and CENELEC for standardization in the field of machines
• Ref Project: EN ISO 13856-2:2013 - Safety of machinery - Pressure-sensitive protective devices - Part 2: General principles for design and testing of pressure-sensitive edges and pressure-sensitive bars (ISO 13856-2:2013)

Relations

• Replaces: SIST EN 1760-2:2002+A1:2009 - Safety of machinery - Pressure sensitive protective devices - Part 2: General principles for the design and testing of pressure sensitive edges and pressure sensitive bars
• Effective Date: 01-Nov-2013

Overview

SIST EN ISO 13856-2:2013 (ISO 13856-2:2013) defines general principles for the design and testing of pressure-sensitive edges and pressure-sensitive bars used as safety guards on machinery. It applies to pressure-sensitive protective devices intended to detect persons or body parts exposed to hazards from moving machine parts. The standard focuses on design, testing and verification of these sensors as safety components - not on selecting a device for a specific machine application or on detailed safety system performance sizing.

Keywords: pressure-sensitive edges, pressure-sensitive bars, safety of machinery, ISO 13856-2, pressure-sensitive protective devices, machine guarding, testing and design.

Key topics and technical requirements

The standard sets out requirements and test procedures covering the following technical topics:

• Effective sensing surface - definition and characteristics for reliable detection.
• Actuating force and force–travel relationships - test methods and measurement of force required to actuate sensors.
• Pre-travel, working travel and overtravel - mechanical travel characteristics that influence response and durability.
• Minimum operating speed, number of operations and durability - operational limits and lifetime testing.
• Sensor output and response behaviour - output signal requirements and interaction with switching devices.
• Reset function and inhibition/blocking - rules for reset behaviour and measures against bypassing.
• Environmental and power supply conditions - tests for performance under environmental stress and supply variations.
• Electrical, hydraulic and pneumatic integration - requirements when sensors interface with different types of control equipment.
• Enclosure, mounting, mechanical strength and recovery after deformation - robustness and installation considerations.
• Marking and information for selection/use - mandatory data to support safe selection, installation, commissioning and maintenance.
• Verification tests - a range of defined test procedures to validate compliance (e.g., actuator force, number of operations, environmental tests).

Note: ISO 13856-2 gives minimum values for SRP/CS (safety-related parts of control systems) but does not determine final performance level selection; it is not intended for dimensioning sensing areas for particular applications.

Practical applications and users

This standard is practical for anyone involved in the specification, design, testing, manufacture or assessment of pressure-sensitive protective devices used for machine guarding:

• Machine designers and OEMs specifying safety edges/bars for conveyors, doors, presses, robots and automated cells.
• Safety engineers responsible for safeguarding, risk assessment and integration of protective devices into safety systems.
• Test laboratories and manufacturers performing type testing, verification and compliance checks.
• Certification and conformity assessors verifying compliance with machinery safety directives.

Related standards and regulatory context

• ISO 13856-2 references and interacts with machine safety system standards (e.g., ISO 13849-1 for SRP/CS) and electrical safety standards (e.g., IEC 60204-1) when relevant.
• The document supports conformity with EU Machinery Directive requirements and has been adopted as a European Standard (EN ISO 13856-2:2013).

For safe, compliant machine guarding, use ISO 13856-2 to guide the design, testing and verification of pressure-sensitive edges and bars alongside system-level risk assessments and control system standards.

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2013
1DGRPHãþD
SIST EN 1760-2:2002+A1:2009
9DUQRVWVWURMHY9DURYDOQHQDSUDYHREþXWOMLYHQDWODNGHO6SORãQDQDþHOD
QDþUWRYDQMDLQSUHVNXãDQMDURERYLQOHWHYREþXWOMLYLKQDWODN,62
Safety of machinery - Pressure-sensitive protective devices - Part 2: General principles
for design and testing of pressure-sensitive edges and pressure-sensitive bars (ISO
13856-2:2013)
Sicherheit von Maschinen - Druckempfindliche Schutzeinrichtungen - Teil 2: Allgemeine
Leitsätze für die Gestaltung und Prüfung von Schaltleisten und Schaltstangen (ISO
13856-2:2013)
Sécurité des machines - Dispositifs de protection sensibles à la pression - Partie 2:
Principes généraux de conception et d'essai des bords et barres sensibles à la pression
(ISO 13856-2:2013)
Ta slovenski standard je istoveten z: EN ISO 13856-2:2013
ICS:
13.110 Varnost strojev Safety of machinery
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 13856-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2013
ICS 13.110 Supersedes EN 1760-2:2001+A1:2009
English Version
Safety of machinery - Pressure-sensitive protective devices -
Part 2: General principles for design and testing of pressure-
sensitive edges and pressure-sensitive bars (ISO 13856-2:2013)
Sécurité des machines - Dispositifs de protection sensibles Sicherheit von Maschinen - Druckempfindliche
à la pression - Partie 2: Principes généraux de conception Schutzeinrichtungen - Teil 2: Allgemeine Leitsätze für die
et d'essai des bords et barres sensibles à la pression (ISO Gestaltung und Prüfung von Schaltleisten und
13856-2:2013) Schaltstangen (ISO 13856-2:2013)
This European Standard was approved by CEN on 1 March 2013.

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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2013 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 13856-2:2013: E
worldwide for CEN national Members.

Contents Page
Foreword .3
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC .4

Foreword
This document (EN ISO 13856-2:2013) 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 2013, and conflicting national standards shall be withdrawn at
the latest by October 2013.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 1760-2:2001+A1:2009.
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.
For relationship with EU Directive, 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 13856-2:2013 has been approved by CEN as EN ISO 13856-2:2013 without any modification.
Annex ZA
(informative)
Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC
This European Standard has been prepared under a mandate given to CEN by the European Commission
and the European Free Trade Association to provide a means of conforming to Essential Requirements of the
New Approach Directive Machinery 2006/42/EC.
Once this standard is cited in the Official Journal of the European Union under that Directive and has been
implemented as a national standard in at least one Member State, 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 Directive 2006/42/EC
Clause(s)/sub-clause(s) of this Essential Requirements (ERs)
Qualifying remarks/Notes
European Standard of Directive 2006/42/EC
Clause 4 Annex I, 1.2 Control systems
Annex I, 1.3 Protection against mechanical
hazards
Annex I, 1.4 Required characteristics of
(guards and) protection devices
Annex I, 1.5 Risks due to other hazards
Annex I, 1.6 Maintenance
Clauses 5 and 6 Annex I, 1.7 Information

WARNING — Other requirements and other EU Directives may be applicable to the product(s) falling within
the scope of this standard.
INTERNATIONAL ISO
STANDARD 13856-2
Second edition
2013-04-15
Safety of machinery — Pressure-
sensitive protective devices —
Part 2:
General principles for design and
testing of pressure-sensitive edges
and pressure-sensitive bars
Sécurité des machines — Dispositifs de protection sensibles à la
pression —
Partie 2: Principes généraux de conception et d’essai des bords et
barres sensibles à la pression
Reference number
ISO 13856-2:2013(E)
©
ISO 2013
ISO 13856-2:2013(E)
© ISO 2013
All rights reserved. Unless otherwise specified, 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
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail [e-mail]
Web www.iso.org
Published in Switzerland
ii © ISO 2013 – All rights reserved

ISO 13856-2:2013(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Requirements for design and testing . 7
4.1 Effective sensing surface . 7
4.2 Actuating force for testing . 9
4.3 Pre-travel .10
4.4 Working travel .10
4.5 Overtravel .10
4.6 Force .
travel relationships .10
4.7 Minimum operating speed .12
4.8 Number of operations .12
4.9 Sensor output .13
4.10 Response of output signal switching device to actuating force .13
4.11 Reset function .13
4.12 Environmental conditions .14
4.13 Power supply variations .15
4.14 Electrical equipment .15
4.15 Hydraulic equipment .16
4.16 Pneumatic equipment .16
4.17 Enclosure .16
4.18 Additional coverings for sensors .17
4.19 Access .17
4.20 Performance levels and categories for SRP/CSs in accordance with ISO 13849-1 .17
4.21 Adjustments .18
4.22 Sensor fixing and mechanical strength .18
4.23 Recovery after deformation .18
4.24 Connections .19
4.25 Sharp corners, sharp edges and rough surfaces .19
4.26 Mechanical features .19
4.27 Inhibition and blocking.19
5 Marking .19
6 Information for selection and use .20
6.1 General .20
6.2 Essential data for the selection of suitable pressure-sensitive edge or
pressure-sensitive bar .20
6.3 Information for use .21
7 Verification of requirements .23
7.1 General .23
7.2 Test samples .24
7.3 Test pieces .24
7.4 Test No. 1 — Safety-related data for selection, installation, commissioning, operation and
maintenance of suitable pressure-sensitive edges or pressure-sensitive bars .25
7.5 Test No. 2 — Mounting orientations of sensors .25
7.6 Test No. 3 — Actuating force .26
7.7 Test No. 4 — Force.
travel relationship(s) .32
7.8 Test No. 5 — Number of operations .32
7.9 Test No. 6 — Output state of sensor and output signal switching device .33
ISO 13856-2:2013(E)
7.10 Test No. 7 — Response of output signal switching device to actuating force, reset and
state of power supply .33
7.11 Test No. 8 — Environmental conditions .33
7.12 Test No. 9 — Power supply variation .35
7.13 Test No. 10 — Electrical, hydraulic and pneumatic equipment.36
7.14 Test No. 11 — Enclosure .36
7.15 Test No. 12 — Additional coverings for sensors .36
7.16 Test No. 13 — Access .36
7.17 Test No. 14 — Performance Level (PL) according to ISO 13849-1 .36
7.18 Test No. 15 — Adjustments .37
7.19 Test No. 16 — Sensor fixing and mechanical strength .37
7.20 Test No. 17 — Recovery after deformation .37
7.21 Test No. 18 — Connections .37
7.22 Test No. 19 — Sharp corners, sharp edges and rough surfaces .37
7.23 Test No. 20 — Mechanical features .37
7.24 Test No. 21 — Inhibition and blocking .38
7.25 Test No. 22 — Marking .38
7.26 Test No. 23 — Information for selection and use .38
Annex A (normative) Timing diagrams for pressure-sensitive edges/bars with/without reset.39
Annex B (informative) Operating speed, force and travel — Explanatory remarks
and recommendations .43
Annex C (informative) Device selection guidance for machinery manufacturer/user .46
Annex D (informative) Design guidance .48
Annex E (informative) Application guidance .51
Annex F (informative) Guidance on commissioning and testing after installation .52
Annex G (informative) General considerations for systems meeting ISO 13849-1, category 2 .54
Bibliography .55
iv © ISO 2013 – All rights reserved

ISO 13856-2:2013(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International
Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies
casting a vote.
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.
ISO 13856-2 was prepared by Technical Committee ISO/TC 199, Safety of machinery and by Technical
Committee CEN/TC 114, Safety of machinery in collaboration.
This second edition cancels and replaces the first edition (ISO 13856-2:2005), which has been
technically revised.
ISO 13856 consists of the following parts, under the general title Safety of machinery — Pressure-sensitive
protective devices:
— Part 1: General principles for design and testing of pressure-sensitive mats and pressure-sensitive floors
— Part 2: General principles for design and testing of pressure-sensitive edges and pressure-sensitive bars
— Part 3: General principles for design and testing of pressure-sensitive bumpers, plates, wires and
similar devices
ISO 13856-2:2013(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 type 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.
The requirements of this document can be supplemented or modified by a type-C standard.
For machines which are covered by the scope of a type-C standard and which have been designed and built
according to the requirements of that standard, the requirements of that type-C standard take precedence.
The safeguarding of machinery (see ISO 12100:2010, 3.21) can be achieved by many different means.
These means include guards which prevent access to the hazard zone by means of a physical barrier
(for example, interlocking guards according to ISO 14119 or fixed guards according to ISO 14120) and
protective devices (for example, electro-sensitive protective equipment according to IEC 61496-1 or
pressure-sensitive protective devices according to this part of ISO 13856).
Type-C standards makers and designers of machinery/installations should consider the best way to
achieve the required level of safety taking into account the intended application and the results of the
risk assessment (see ISO 12100).
The required solution can also be to combine several of these different means. The machinery/installation
supplier and the user examine together carefully the existing hazards and constraints before making
their decision on the choice of safeguarding.
Pressure-sensitive edges and pressure-sensitive bars are safeguards of the mechanically-actuated trip
device type. General requirements for these safeguards (as well as others) are given in ISO 12100:2010,
6.3.1 and 6.3.2.
Pressure-sensitive edges and pressure-sensitive bars are used in a wide range of applications with
different conditions of use relating, for example, to extremes of loading or electrical, physical and
chemical environments. They are interfaced with machine controls to ensure that the machine reverts
to a safe condition if the sensitive protective equipment is actuated.
This part of ISO 13856 is restricted to the design of pressure-sensitive edges and pressure-sensitive
bars so that they can be used when the risk assessment carried out by the machine manufacturer and/or
relevant type-C standard, when available, shows this to be appropriate.
Pressure-sensitive edges and pressure-sensitive bars can be fitted to a fixed or moving part of a machine
or an obstacle to prevent trapping or crushing hazards from another part of a machine. Pressure-
sensitive edges and pressure-sensitive bars are designed, selected, installed and/or interfaced with the
control system of the machine so that the force/pressure applied to a person or parts of the body do not
exceed certain limits.
Pressure-sensitive edges, pressure-sensitive bars, pressure-sensitive bumpers and similar devices have
many similarities. Table 1 summarizes the differences which generally apply between the two types of
vi © ISO 2013 – All rights reserved

ISO 13856-2:2013(E)
pressure-sensitive protective devices covered by this part of ISO 13856 and pressure-sensitive bumpers
(covered by ISO 13856-3 and gives guidance for their application).
Table 1 — Characteristic features of pressure-sensitive edges, pressure-sensitive bars
and pressure-sensitive bumpers
Pressure-sensitive
Pressure-sensitive edge Pressure-sensitive bar
bumper
Cross-section
Regular Regular Regular/irregular
Length/width ratio >1 Any ratio Any ratio
Effective sensing sur- Deforms locally Moves as a whole Deforms locally and/or
face moves as a whole
Body part(s) intended Finger Finger —
to be detected
Hand Hand Hand
Arm Arm Arm
Leg Leg Leg
Head Head Head
Torso Torso Torso
INTERNATIONAL STANDARD ISO 13856-2:2013(E)
Safety of machinery — Pressure-sensitive protective
devices —
Part 2:
General principles for design and testing of pressure-
sensitive edges and pressure-sensitive bars
1 Scope
This part of ISO 13856 establishes general principles and specifies requirements for the design and
testing of pressure-sensitive edges and pressure-sensitive bars used as safeguards and not as actuating
devices for normal operation.
This part of ISO 13856 is applicable to pressure-sensitive edges and pressure-sensitive bars, with or
without an external reset facility, used to detect persons or body parts that can be exposed to hazards
such as those caused by the moving parts of machines.
It is not applicable to
— determining the suitability of a pressure-sensitive edge or pressure-sensitive bar for a particular
safeguarding application,
— selection of an appropriate performance level for safety-related parts of control systems (SRP/CSs)
other than to give minimum values,
— dimensioning or configuring of the effective sensing area of pressure-sensitive edges or pressure-
sensitive bars in relation to any particular application,
— stopping devices according to IEC 60204-1 used only for normal operation, including emergency
stopping of machinery.
Requirements for the information to be provided by the manufacturer are given to assist in the selection
of a suitable pressure-sensitive edge or pressure-sensitive bar and its application.
Additional requirements can be necessary where pressure-sensitive edges or pressure-sensitive bars
are used in locations accessible to elderly or disabled people or children.
2 Normative references
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.
ISO 4413, Hydraulic fluid power — General rules and safety requirements for systems and their components
ISO 4414, Pneumatic fluid power — General rules and safety requirements for systems and their components
ISO 12100:2010, Safety of machinery — General principles for design — Risk assessment and risk reduction
ISO 13849-1:2006, Safety of machinery — Safety-related parts of control systems — Part 1: General
principles for design
ISO 13849-2, Safety of machinery — Safety-related parts of control systems — Part 2: Validation
ISO 13856-2:2013(E)
IEC 60068-2-6, Environmental testing — Part 2-6: Tests — Test Fc: Vibration (sinusoidal)
IEC 60068-2-14, Environmental testing — Part 2-14: Tests — Test N: Change of temperature
IEC 60068-2-27, Environmental testing — Part 2-27: Tests — Test Ea and guidance: Shock
IEC 60068-2-78, Environmental testing — Part 2-78: Tests — Test Cab: Damp heat, steady state
IEC 60204-1:2005, Safety of machinery — Electrical equipment of machines — Part 1: General requirements
IEC 60529, Degrees of protection provided by enclosures (IP code)
IEC 60664-1:2007, Insulation coordination for equipment within low-voltage systems — Part 1: Principles,
requirements and tests
IEC 60947-5-1:2003, Low-voltage switchgear and controlgear — Part 5-1: Control circuit devices and
switching elements — Electromechanical control circuit devices
IEC 61000-4-2, Electromagnetic compatibility (EMC) — Part 4-2: Testing and measuring techniques —
Electrostatic discharge immunity test
IEC 61000-4-3, Electromagnetic compatibility (EMC) — Part 4-3: Testing and measurement techniques —
Radiated, radio-frequency, electromagnetic field immunity test
IEC 61000-4-4, Electromagnetic compatibility (EMC) — Part 4-4: Testing and measurement techniques —
Electrical fast transient/burst immunity test
IEC 61000-4-5, Electromagnetic compatibility (EMC) — Part 4-5: Testing and measurement techniques —
Surge immunity test
IEC 61000-4-6, Electromagnetic compatibility (EMC) — Part 4-6: Testing and measurement techniques —
Immunity to conducted disturbances, induced by radio-frequency fields
IEC 61000-6-2, Electromagnetic compatibility (EMC) — Part 6-2: Generic standards — Immunity for
industrial environments
IEC 61439-1:2011, Low-voltage switchgear and controlgear assemblies — Part 1: General rules
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 12100, ISO 13849-1 and the
following apply.
3.1
pressure-sensitive edge
sensitive protective equipment of the “mechanically activated trip” type comprising a sensor (3.3) or
sensors and a control unit and one or more output signal switching devices (3.5) intended to detect
contact with a person or body part of a person and where the effective sensing surface (3.9) is deformed
locally to actuate the sensor(s)
Note 1 to entry: The sensor or sensors generate(s) a signal when pressure is applied to part of its surface. The control
unit responds to the signal from the sensor and generates an output signal(s) to the control system of a machine.
Note 2 to entry: The length of the sensor(s) is greater than the width. The cross-section throughout the pressure-
sensitive area is constant and its width is usually within the range from 8 mm to 80 mm.
Note 3 to entry: For the definition of sensitive protective equipment see ISO 12100:2010, 3.28.5.
2 © ISO 2013 – All rights reserved

ISO 13856-2:2013(E)
3.2
pressure-sensitive bar
sensitive protective equipment of the “mechanically activated trip” type comprising a sensor (3.3) or
sensors and a control unit and one or more output signal switching devices (3.5) intended to detect
contact with a person or body part of a person and where the effective sensing surface (3.9) moves as a
whole to actuate the sensor(s)
Note 1 to entry: The sensor or sensors generate(s) a signal when pressure is applied to part of its surface. The control
unit responds to the signal from the sensor and generates an output signal(s) to the control system of a machine.
Note 2 to entry: The length of the sensor(s) is greater than the width. The cross-section throughout the pressure-
sensitive area is constant and its width is usually within the range from 8 mm to 80 mm.
Note 3 to entry: For the definition of sensitive protective equipment see ISO 12100:2010, 3.28.5.
3.3
sensor
part of the pressure-sensitive edge (3.1) or pressure-sensitive bar (3.2) which generates a signal in response
to sufficient pressure applied to part of its surface
Note 1 to entry: 3.3 to 3.5 define the functional components of a pressure-sensitive edge or pressure-sensitive
bar. These functions can be integrated into a single assembly or can be contained in any number of separate
assemblies (see Figure 1). For example, a simple pressure-sensitive edge or pressure-sensitive bar actuating a
position switch can be considered to be the sensor, the control unit, and the output signal switching device.
3.4
control unit
part of the pressure-sensitive edge (3.1) or pressure-sensitive bar (3.2) which responds to the condition of
the sensor (3.3) and generates output signals to the machine control system
Note 1 to entry: 3.3 to 3.5 define the functional components of a pressure-sensitive edge or pressure-sensitive
bar. These functions can be integrated into a single assembly or can be contained in any number of separate
assemblies (see Figure 1). For example, a simple pressure-sensitive edge or pressure-sensitive bar actuating a
position switch can be considered to be the sensor, the control unit, and the output signal switching device.
3.5
output signal switching device
part of the control unit of a pressure-sensitive edge (3.1) or pressure-sensitive bar (3.2) which is connected
to the machine control system and transmits output signals
Note 1 to entry: 3.3 to 3.5 define the functional components of a pressure-sensitive edge or pressure-sensitive
bar. These functions can be integrated into a single assembly or can be contained in any number of separate
assemblies (see Figure 1). For example, a simple pressure-sensitive edge or pressure-sensitive bar actuating a
position switch can be considered to be the sensor, the control unit, and the output signal switching device.
3.6
ON state
state in which the output circuit(s) of an output signal switching device (3.5) is complete and permits the
flow of current or fluid
3.7
OFF state
state in which the output circuit(s) of an output signal switching device (3.5) is broken and interrupts the
flow of current or fluid
3.8
actuating force
any force applied to the sensor (3.3) which causes an output signal switching device (3.5) to go to the
OFF state (3.7)
ISO 13856-2:2013(E)
3.9
effective sensing surface
part of the surface of the sensor (3.3) or a combination of sensors within the effective sensing angle (3.12)
and the effective sensing length (3.10) where the application of an actuating force (3.8) creates an OFF
state (3.7) in the output signal switching device (3.5)
Note 1 to entry: See, for example, Figures 2 and 3.
3.10
effective sensing length
length of the effective sensing surface (3.9)
3.11
reference axis
line in the direction of the length of the sensor (3.3), whose position in the cross-sectional view of the
sensor is used to define the effective sensing surface (3.9)
Note 1 to entry: See Figures 2 and 3.
3.12
effective sensing angle
angle around the reference axis (3.11) which limits the effective sensing surface (3.9) along the effective
sensing length (3.10)
Note 1 to entry: See Figures 2 and 3.
3.13
reference direction
direction of actuation, from a point on the effective sensing surface (3.9) towards the reference axis (3.11),
which bisects the effective sensing angle (3.12) and is perpendicular to the reference axis
Note 1 to entry: See Figures 2 and 3.
3.14
dead surface
part of the surface area of the sensor (3.3) outside the effective sensing surface (3.9)
Note 1 to entry: See Figures 2 and 3.
3.15
pre-travel
distance travelled by an object moving in a direction perpendicular to the reference axis (3.11) and in the
axis of the applied actuating force (3.8), measured from where this object touches the effective sensing
surface (3.9) to where the output signal switching device(s) (3.5) changes to an OFF state (3.7) under
specified conditions
Note 1 to entry: See Figure 4.
3.16
working travel
distance travelled by an object, moving in a direction perpendicular to the reference axis (3.11), from
where this object touches the effective sensing surface (3.9), under specified conditions, to where a stated
limit force is exerted on the object
Note 1 to entry: See Figure 4.
3.17
overtravel
difference between the working travel (3.16) and the pre-travel (3.15) when both are measured with the
same object applied under the same conditions
Note 1 to entry: See Figure 4.
4 © ISO 2013 – All rights reserved

ISO 13856-2:2013(E)
3.18
force–travel relationship
relationship between force applied perpendicular to the reference axis (3.11) and the distance travelled
by a specified object perpendicular to the reference axis under specified conditions
Note 1 to entry: See Figure 4.
3.19
reset
function which permits an ON state (3.6) in an output signal switching device (3.5) provided that certain
conditions are met
Note 1 to entry: See Annex A.
3.20
total travel
movement or deformation of the effective sensing surface (3.9) of a pressure-sensitive edge (3.1) or
pressure-sensitive bar (3.2) which is measured in the direction of the actuating force (3.8) from the point
of contact to the point at which no further significant deformation of the effective sensing surface occurs
(e.g. at a force of 600 N)
3.21
start interlock
means which prevents the start of an automatic machine when power (e.g. the electrical supply) is switched
on to the pressure-sensitive edge (3.1) or pressure-sensitive bar (3.2), or is interrupted and restored
3.22
operating speed
any speed at which an object is pressed against the sensor (3.3) and which causes the output signal
switching device (3.5) to go to the OFF state (3.7)
ISO 13856-2:2013(E)
Key
1 pressure-sensitive edge or pressure-sensitive bar
2 sensor(s)
3 control unit*
4 output signal switching device(s)*
5 part of the machine control system for pressure-sensitive edge or pressure-sensitive bar output signal
processing
a
Actuating force.
b
Sensor output signal.
c
ON state/OFF state signal.
d
Manual reset signal**.
e
Reset signal from machine control system (where appropriate).
f
Monitoring signals (optional).
g
Manual reset signal to machine control system***.
h
Machine control system(s).
* Can be located within the machine control system or as part of the machine control system.
** Where appropriate, this may be used as an alternative to g.
*** Where appropriate, this may be used as an alternative to d.
Figure 1 — Systematic sketch of pressure-sensitive edge or pressure-sensitive bar as
applied to machine
6 © ISO 2013 – All rights reserved

ISO 13856-2:2013(E)
4 Requirements for design and testing
4.1 Effective sensing surface
NOTE For the purposes of this part of ISO 13856, “normal operation” means compliance with the requirements
of Clause 4, verified according to Clause 7.
The manufacturer of the pressure-sensitive protective device shall state the effective sensing surface
by giving the dimensions X, Y, Z, the angles α and β and the effective sensing length L in accordance with
Figures 2 and 3.
The effective sensing angle of pressure-sensitive protective devices with heights (see Figure 2)
X + Z ≥ 40 mm shall be ≥ 90°.
The effective sensing angle of pressure-sensitive protective devices with heights X + Z < 40 mm shall be
at least 40°.
If the effective sensing angle is less than 90°, a clear warning shall be given in the information for use
(see Clause 6).
a) Symmetrical with dead surface at ends
b) Symmetrical without dead surface at ends
ISO 13856-2:2013(E)
c) Asymmetrical with dead surface at ends
d) Asymmetrical without dead surface at ends
Key
1 reference direction
2 reference axis
L effective sensing length
α effective sensing angle
β see 7.5.2
effective sensing surface
dead surface
Figure 2 — Effective sensing surfaces of pressure-sensitive edges
8 © ISO 2013 – All rights reserved

ISO 13856-2:2013(E)
Key
1 reference direction
2 reference axis
L effective sensing lengt
...