SIST EN 62744:2015

Dynamic representation of Graphical symbols (IEC 62744:2014)

This international standard provides generic rules for the representation of states of objects
by graphical symbols standardized in IEC 60617, ISO 14617, IEC 60417, for example, and for
future graphical symbols included in these standards.
NOTE 1 Graphical symbols in IEC 60617, ISO 14617 and IEC 60417 are mostly presented with a single graphic,
not representing the different operational states of objects occurring during their life cycle, e.g. in operation, of the
object that the graphical symbol represents.
NOTE 2 The graphical symbols in IEC 60617 and ISO 14617 are – at the time of writing of the first edition of this
standard – generally shown in the operational state “not energized”.
NOTE 3 Within the different periods of an object within its life cycle, i.e. design, manufacturing, operation,
disposal, each period counts with different states. However, this standard focuses only on those states occurring
during the active operation period from an object put into service until it is taken out of service.
This horizontal standard has the purpose of:
• ensuring the coherence of the corpus of standardization documents;
• avoiding duplication of work and contradictory requirements.
The standard provides operational states of an object as examples that typically occur and
which need to be represented by standardized graphical symbols and defines generic rules to
be applied. It specifies which types of presentation facilities are recommended to present the
different operational states to humans.
States concerning the different types of alarm, their classification and management are not
dealt with in this standard.
This standard does neither define rules for the design of static graphical symbols for
diagrams as provided in IEC 61082 and the ISO/IEC 81714 series nor for icons and graphical
symbols for use on equipment as provided in IEC 60417, ISO 7000 and in the ISO/IEC
11581 series.
This horizontal standard is primarily intended for use by technical committees in the
preparation of standards in accordance with the principles laid down in IEC Guide 108.
One of the responsibilities of a technical committee is, wherever applicable, to make use of
horizontal standards in the preparation of its publications. The content of this horizontal
standard will not apply unless specifically referred to or included in the relevant publications.

Darstellung von Objektzuständen mittels grafischer Symbole (IEC 62744:2014)

Représentation d'états d'objets par des symboles graphiques (CEI 62744:2014)

L'IEC 62744:2014 fournit les règles génériques pour la représentation d'états d'objets par des symboles graphiques normalisés dans les normes IEC 60617, ISO 14617, IEC 60417, par exemple, et pour les symboles graphiques futurs inclus dans ces normes. Elle fournit éfalement les états opérationnels d'un objet à titre d'exemples qui se produisent typiquement et qu'il est nécessaire de représenter par des symboles graphiques normalisés. Elle définit également les règles génériques à appliquer. Elle spécifie les types de moyens de représentation recommandés pour présenter les différents états opérationnels aux êtres humains.

Dinamična predstavitev grafičnih simbolov (IEC 62744:2014)

Ta mednarodni standard določa splošna pravila za predstavitev stanj predmetov z grafičnimi simboli, ki so standardizirani npr. v standardih IEC 60617, ISO 14617 in IEC 60417 ter za prihodnje grafične simbole, ki so vključeni v teh standardih.
OPOMBA 1 Grafični simboli v standardih IEC 60617, ISO 14617 in IEC 60417 so v večini primerov predstavljeni z eno grafiko (ki ne predstavlja različnih obratovalnih stanj predmetov v času njihove življenjske dobe, npr. med delovanjem) predmeta, ki ga predstavlja za grafični simbol.
OPOMBA 2 Grafični simboli v standardih IEC 60617 in ISO 14617 so – v času pisanja prve izdaje tega standarda – običajno prikazani v obratovalnem stanju »brez napajanja«.
OPOMBA 3 Različna obdobja objekta v okviru njegove življenjske dobe, t. j. oblikovanja, izdelave, delovanja in odstranjevanja, so zaznamovana z različnimi stanji. Kljub temu se ta standard osredotoča le na tista stanja, ki nastanejo med aktivnim obratovalnim obdobjem, t. j. od začetka uporabe predmeta do njegove odstranitve.
Namen tega horizontalnega standarda je:
• zagotoviti koherenco korpusa standardiziranih dokumentov;
• izogibanje podvajanja dela in nasprotujočih si zahtev.
Ta standard določa obratovalna stanja predmeta kot primere, ki se običajno pripetijo in jih je treba predstaviti s standardiziranimi grafičnimi simboli, ter splošna pravila, ki jih je treba uporabiti. Določa, katere vrste predstavitvene opreme so priporočene za predstavitev različnih obratovalnih stanj ljudem.
Stanja, povezana z različnimi vrstami alarmov, njihova razvrstitev in upravljanje niso zajeta v tem standardu.
Ta standard ne določa pravil niti za načrtovanje statičnih grafičnih simbolov za diagrame, kot je določeno s skupinama standardov IEC 61082 in ISO/IEC 81714 niti za ikone in grafične simbole za uporabo na opremi, kot je določeno v skupinah standardov IEC 60417, ISO 7000 in ISO/IEC 11581.
Ta horizontalni standard je namenjen predvsem tehničnim odborom za pripravo standardov v skladu z načeli vodila IEC Guide 108.
Ena od pristojnosti tehničnih odborov je, da med pripravo publikacij uporabljajo horizontalne standarde, kadar je to primerno. Vsebina tega horizontalnega standarda se ne uporablja, razen če je izrecno navedena ali zajeta v ustreznih publikacijah.

General Information

• Status: Published
• Publication Date: 17-Mar-2015
• ICS: 01.080.01 - Graphical symbols in general
• Technical Committee: EDO - Documentation and graphical symbols
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 16-Jan-2015
• Due Date: 23-Mar-2015
• Completion Date: 18-Mar-2015
• Ref Project: EN 62744:2015 - Representation of states of objects by graphical symbols

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 62744:2015
01-april-2015
'LQDPLþQDSUHGVWDYLWHYJUDILþQLKVLPERORY,(&
Dynamic representation of Graphical symbols (IEC 62744:2014)
Darstellung von Objektzuständen mittels grafischer Symbole (IEC 62744:2014)
Représentation d'états d'objets par des symboles graphiques (CEI 62744:2014)
Ta slovenski standard je istoveten z: EN 62744:2015
ICS:
01.080.01 *UDILþQLVLPEROLQDVSORãQR Graphical symbols in general
SIST EN 62744:2015 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 62744:2015

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SIST EN 62744:2015


EUROPEAN STANDARD EN 62744

NORME EUROPÉENNE

EUROPÄISCHE NORM
January 2015
ICS 01.080.20

English Version
Representation of states of objects by graphical symbols
(IEC 62744:2014)
Représentation d'états d'objets par des symboles Darstellung von Objektzuständen mittels grafischer
graphiques Symbole
(IEC 62744:2014) (IEC 62744:2014)
This European Standard was approved by CENELEC on 2015-01-01. 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.


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
© 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN 62744:2015 E

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SIST EN 62744:2015
EN 62744:2015 - 2 -
Foreword
The text of document 3/1194A/FDIS, future edition 1 of IEC 62744, prepared by IEC/TC 3 "Information
structures, documentation and graphical symbols" was submitted to the IEC-CENELEC parallel vote
and approved by CENELEC as EN 62744:2015.
The following dates are fixed:
(dop) 2015-10-01
• latest date by which the document has to be implemented at
national level by publication of an identical national
standard or by endorsement
(dow) 2018-01-01
• latest date by which the national standards conflicting with
the document have to be withdrawn

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 62744:2014 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60447:2004 NOTE Harmonized as EN 60447:2004 (not modified).
IEC 61082-1:2006 NOTE Harmonized as EN 61082-1:2006 (not modified).
IEC 61310-1:2007 NOTE Harmonized as EN 61310-1.
IEC 61355 NOTE Harmonized as EN 61355.
IEC 61966-2-1:1999 NOTE Harmonized as EN 61966-2-1:2000 (not modified).
IEC 61966-2-1:1999/A1:2003 NOTE Harmonized as EN 61966-2-1:2000/A1:2003 (not modified).
IEC 62542:2013 NOTE Harmonized as EN 62542:2013 (not modified).
1)
IEC 62682:2014 NOTE Harmonized as EN 62682:2014 (not modified).
IEC 80416-1:2008 NOTE Harmonized as EN 80416-1:2009 (not modified).
IEC 81346-1:2009 NOTE Harmonized as EN 81346-1:2009 (not modified).

1) To be published.

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SIST EN 62744:2015
- 3 - EN 62744:2015
IEC 81714-2:2006 NOTE Harmonized as EN 81714-2:2007 (not modified).
ISO/IEC 81714-1:2010 NOTE Harmonized as EN ISO 81714-1:2010 (not modified).
ISO 7731:2003 NOTE Harmonized as EN ISO 7731:2008 (not modified).
ISO 24502:2010 NOTE Harmonized as EN ISO 24502:2010 (not modified).

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SIST EN 62744:2015
EN 62744:2015 - 4 -
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 1 When an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is
available here: www.cenelec.eu.

Publication Year Title EN/HD Year
IEC 60073 2002 Basic and safety principles for man- EN 60073 2002
machine interface, marking and
identification - Coding principles for
indicators and actuators
IEC 60417 -  Graphical symbols for use on equipment - -
IEC 60617 -  Graphical symbols for diagrams - -
IEC 61360-4 -  Standard data element types with EN 61360-4 -
associated classification scheme for
electric components -
Part 4: IEC reference collection of standard
data element types and component classes
IEC Guide 108 -  Guidelines for ensuring the coherency of - -
IEC publications - Application of horizontal
standards
ISO 7000 -  Graphical symbols for use on equipment - - -
Registered symbols
ISO 14617 series Graphical symbols for diagrams - -

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SIST EN 62744:2015




IEC 62744

®


Edition 1.0 2014-11




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE
colour

inside



HORIZONTAL STANDARD

NORME HORIZONTALE




Representation of states of objects by graphical symbols



Représentation d'états d'objets par des symboles graphiques



















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE

PRICE CODE
INTERNATIONALE

CODE PRIX V


ICS 01.080.20 ISBN 978-2-8322-1935-5



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

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SIST EN 62744:2015
– 2 – IEC 62744:2014 © IEC 2014
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and abbreviations . 8
3.1 Terms and definitions . 8
3.2 Abbreviations . 12
4 General . 12
5 Reasons for dynamic representation of objects . 13
5.1 General . 13
5.2 Change of state of an object in the supervised process . 13
5.3 Operators command/action . 14
5.4 Time controlled activities . 15
5.5 Sporadic change . 15
6 Area of application . 16
6.1 General . 16
6.2 SCADA user interface . 16
6.3 Process control user interface . 16
6.4 Engineering and configuration tool interface . 16
6.5 Different operator displays of product with interactive functions . 16
6.6 Graphical symbols related to safety signal words such as danger, warning
and caution . 17
6.6.1 Graphical symbols related to safety . 17
6.6.2 Symbols in alarm and signalling displays . 18
6.7 Representation of actuators . 18
6.7.1 General . 18
6.7.2 Recommended location of information associated with graphical
symbols . 18
6.8 Instructions for use in electronic form . 20
7 Types of presentation – Rules and examples . 20
7.1 General . 20
7.2 Change of shape . 21
7.2.1 General . 21
7.2.2 Usage of symbols . 21
7.3 Change of colours . 21
7.3.1 General . 21
7.3.2 Use of background colours . 22
7.3.3 Colour contrast . 22
7.3.4 Operational states and associated recommended colours . 22
7.3.5 Flashing . 22
7.4 Change size . 23
7.5 Acoustic codes . 23
7.6 Actuators as parts of a pictorial presentation on a video display unit . 23
7.7 Add-in or change letters/text . 23
7.8 Combination of presentation types on the same graphical symbol . 24
8 Consideration of regional or national legislation . 28

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SIST EN 62744:2015
IEC 62744:2014 © IEC 2014 – 3 –
Annex A (informative) Example of presentation of a graphical symbol in different
forms for use on equipment . 29
Bibliography . 30

Figure 1 – Example of changing the operational state from OFF to ON . 15
Figure 2 – Recommended location of information associated with graphical symbols . 19
Figure 3 – Examples of graphical symbols including related information . 20

Table 1 – Generic operational states used during operation of an object (informative /
exemplary) . 13
Table 2 – General principles for meaning of basic shapes . 17
Table 3 – Meaning of indication codes with respect to the operational states . 25
Table A.1 – Example of presentation of the graphical symbol ISO 7000-0034
representing different operational temperature states . 29

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SIST EN 62744:2015
– 4 – IEC 62744:2014 © IEC 2014
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

REPRESENTATION OF STATES OF
OBJECTS BY GRAPHICAL SYMBOLS

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 62744 has been prepared by IEC technical committee 3:
Information structures, documentation and graphical symbols.
It has the status of a horizontal standard in accordance with IEC Guide 108.
The text of this standard is based on the following documents:
FDIS Report on voting
3/1194A/FDIS 3/1205/RVD

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.

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SIST EN 62744:2015
IEC 62744:2014 © IEC 2014 – 5 –
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.

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SIST EN 62744:2015
– 6 – IEC 62744:2014 © IEC 2014
INTRODUCTION
This international standard deals with the representation of operational states of objects by
standardized graphical symbols. The graphical symbols presented in standards like
IEC 60417, IEC 60617 and ISO 14617 are actually presented in a static form. This standard
establishes rules and recommendations for how objects being represented by graphical
symbols can be presented with a dynamic behaviour indicating the operational states of
objects occurring in practice. This standard provides guidance for developers and designers
of graphical symbols, for example in IEC 60617, ISO 14617, IEC 60417 or any other pictorial
representation of an object if being requested to consider additional forms for the presentation
of operational states.
This standard also provides information relevant to designers of HMI systems, to be installed
in rooms with appropriate ambient conditions (e.g. used for supervising systems).
This standard does not define rules for the design of static graphical symbols for diagrams as
provided in IEC 61082 and the ISO/IEC 81714 series or for icons and graphical symbols for
use on equipment as provided in IEC 60417, ISO 7000 and in the ISO/IEC 11581 series.
This standard does not define a list indicating which existing graphical symbols are available
to be used to represent objects in their operational states following the rules established in
this standard.

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SIST EN 62744:2015
IEC 62744:2014 © IEC 2014 – 7 –
REPRESENTATION OF STATES OF
OBJECTS BY GRAPHICAL SYMBOLS



1 Scope
This international standard provides generic rules for the representation of states of objects
by graphical symbols standardized in IEC 60617, ISO 14617, IEC 60417, for example, and for
future graphical symbols included in these standards.
NOTE 1 Graphical symbols in IEC 60617, ISO 14617 and IEC 60417 are mostly presented with a single graphic,
not representing the different operational states of objects occurring during their life cycle, e.g. in operation, of the
object that the graphical symbol represents.
NOTE 2 The graphical symbols in IEC 60617 and ISO 14617 are – at the time of writing of the first edition of this
standard – generally shown in the operational state “not energized”.
NOTE 3 Within the different periods of an object within its life cycle, i.e. design, manufacturing, operation,
disposal, each period counts with different states. However, this standard focuses only on those states occurring
during the active operation period from an object put into service until it is taken out of service.
This horizontal standard has the purpose of:
• ensuring the coherence of the corpus of standardization documents;
• avoiding duplication of work and contradictory requirements.
The standard provides operational states of an object as examples that typically occur and
which need to be represented by standardized graphical symbols and defines generic rules to
be applied. It specifies which types of presentation facilities are recommended to present the
different operational states to humans.
States concerning the different types of alarm, their classification and management are not
dealt with in this standard.
This standard does neither define rules for the design of static graphical symbols for
diagrams as provided in IEC 61082 and the ISO/IEC 81714 series nor for icons and graphical
symbols for use on equipment as provided in IEC 60417, ISO 7000 and in the ISO/IEC
11581 series.
This horizontal standard is primarily intended for use by technical committees in the
preparation of standards in accordance with the principles laid down in IEC Guide 108.
One of the responsibilities of a technical committee is, wherever applicable, to make use of
horizontal standards in the preparation of its publications. The content of this horizontal
standard will not apply unless specifically referred to or included in the relevant publications.
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.
IEC 60073:2002, Basic and safety principles for man-machine interface, marking and
identification – Coding principles for indicators and actuators

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SIST EN 62744:2015
– 8 – IEC 62744:2014 © IEC 2014
IEC 60417, Graphical symbols for use on equipment. Available from http://www.graphical-
symbols.info/equipment
IEC 60617, Graphical symbols for diagrams. Available from IEC 60617 – Graphical Symbols
for Diagrams
IEC 61360-4, Standard data element types with associated classification scheme for electric
components – Part 4: IEC reference collection of standard data element types and component
classes. Available from http://std.iec.ch/iec61360
IEC Guide 108, Guidelines for ensuring the coherency of IEC publications - Application of
horizontal standards
ISO 14617 (all parts), Graphical symbols for diagrams;
ISO 7000, Graphical symbols for use on equipment – Index and synopsis; Registered symbols
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
graphical symbol
visually perceptible figure with a particular meaning used to transmit information
independently of language
Note 1 to entry: The graphical symbol may represent objects, such as products, functions or requirements for
manufacturing and use, quality control, etc.
Note 2 to entry: A graphical symbol is not to be confused with the simplified representation of products which is
normally drawn to scale and which can look like a picture.
[SOURCE: ISO 81714-1:2010, 3.1, modified – "and use" added in Note 1, "…like a graphical
symbol" replaced by "…like a picture" in Note 2.]
3.1.2
presentation set (of objects)
set of discrete presentation forms of a graphical symbol representing an object, each form
representing a defined operational state of the object, used for dynamic presentation
Note 1 to entry: The different forms of a graphical symbol are derived from a basic graphical symbol, such
forming a symbol family.
Note 2 to entry: According to IEC 61082-1 a graphical symbol will represent the object in a de-energized
operational state, i.e. in the position OFF.
Note 3 to entry: This includes audible and visible but not tangible (e.g. BRAILLE) presentation facilities
3.1.3
operational state
defined states within the being-in-service period which an object can have
3.1.4
acoustic signal; auditory signal
message conveyed by means of tone, frequency and intermittency, emanating from a sound
source
[SOURCE: IEC 60073:2002, 3.2.1]

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SIST EN 62744:2015
IEC 62744:2014 © IEC 2014 – 9 –
3.1.5
tactile signal
message conveyed by means of vibration, force, surface roughness, contour or position
[SOURCE: IEC 60073:2002, 3.2.2]
3.1.6
visual signal
message conveyed by means of brightness, contrast, colour, shape, size or position
Note 1 to entry: Flashing visual characteristics may be used to attract attention, and especially to give additional
emphasis
[SOURCE: IEC 60073:2002, 3.2.3, modified – Note 1 to entry added.]
3.1.7
actuator
part of the actuating system which receives a human actuating action
Note 1 to entry: For the purposes of this standard, the actuator in the case of an interactive screen display is
considered to be that part of the screen display which represents the actuator functions.
[SOURCE: IEC 60447:2004, 3.1, modified – The notes have been replaced by Note 1 to
entry.]
3.1.8
man-machine interface
MMI
human-machine interface
HMI
part of the equipment intended to provide a direct means of communication between the
operator and the equipment, and which enables the operator to control and monitor the
operation of the equipment
Note 1 to entry: Such parts may include manually operated actuators, indicators and screens.
[SOURCE: IEC 60447:2004, 3.3, modified – addition of "human-machine interface (HMI)".]
3.1.9
brightness
attribute of a visual sensation according to which an area appears to emit more or less light
[SOURCE: IEC 60050-845:1987, 845-02-28]
3.1.10
contrast
1) in the perceptual sense: Assessment of the difference in appearance of two or more parts
of a field seen simultaneously or successively (hence: brightness contrast, lightness
contrast, colour contrast, simultaneous contrast, successive contrast, etc.)
2) in the physical sense: Quantity intended to correlate with the perceived brightness
contrast, usually defined by one of a number of formulae which involve the luminance of
the stimuli considered, for example: ∆L / L near the luminance threshold or L /L for much
1 2
higher luminance
[SOURCE: IEC 60050-845:1987, 845-02-47]

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SIST EN 62744:2015
– 10 – IEC 62744:2014 © IEC 2014
3.1.11
perceived colour
colour
attribute of visual perception consisting of any combination of chromatic and achromatic
content. This attribute can be described by chromatic colour names such as yellow, orange,
brown, red, pink, green, blue, purple, etc., or by achromatic colour names such as white, grey,
black, etc., and qualified by bright, dim, light, dark, etc., or by combinations of such names.
Note 1 to entry: Perceived colour depends on the spectral distribution of the colour stimulus, on the size, shape,
structure and surround of the stimulus area, on the state of adaptation of the observer's visual system, and on the
observer's experience of the prevailing and similar situations of observation.
Note 2 to entry: See Notes 1 and 2 to IEC 60050-845:1987, 845-03-01.
Note 3 to entry: Perceived colour may appear in several modes of colour appearance. The names for various
modes of appearance are intended to distinguish among qualitative and geometric differences of colour
perceptions. Some of the more important terms of the modes of colour appearance are given in
IEC 60050-845:1987, 845-02-19, 20, 21.
Other modes of colour appearance include film colour, volume colour, illuminant colour, body colour, and Ganzfeld
colour. Each of these modes of colour appearance may be further qualified by adjectives to describe combinations
of colour or their spatial and temporal relationships. Other terms that relate to qualitative differences among
colours perceived in various modes of col
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