SIST EN 81714-2:2008

SLOVENSKI STANDARD
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Design of graphical symbols for use in the technical documentation of products - Part 2:
Specification for graphical symbols in a computer sensible form, including graphical
symbols for a reference library, and requirements for their interchange (IEC 81714-
2:2006)
Gestaltung von graphischen Symbolen zur Anwendung in der technischen
Produktdokumentation - Teil 2: Spezifikation für graphische Symbole in
rechnerinterpretierbarer Form einschließlich graphischer Symbole für eine
Referenzbibliothek und Anforderungen für ihren Datenaustausch (IEC 81714-2:2006)
Création de symboles graphiques utilisables dans la documentation technique de
produits - Partie 2: Spécification pour symboles graphiques sous forme adaptée à
l'ordinateur, y compris les symboles pour bibliothèque de références et exigences
relatives à leur échange (IEC 81714-2:2006)
Ta slovenski standard je istoveten z: EN 81714-2:2007
ICS:
01.080.50
35.240.01
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 81714-2
NORME EUROPÉENNE
March 2007
EUROPÄISCHE NORM
ICS 01.080.50 Supersedes EN 81714-2:1998

English version
Design of graphical symbols
for use in the technical documentation of products -
Part 2: Specification for graphical symbols
in a computer sensible form, including graphical symbols
for a reference library, and requirements for their interchange
(IEC 81714-2:2006)
Création de symboles graphiques Gestaltung von graphischen Symbolen
utilisables dans la documentation zur Anwendung in der technischen
technique de produits - Produktdokumentation -
Partie 2: Spécification Teil 2: Spezifikation für graphische
pour symboles graphiques Symbole in rechnerinterpretierbarer Form
sous forme adaptée à l'ordinateur, einschließlich graphischer Symbole
y compris les symboles pour bibliothèque für eine Referenzbibliothek
de références et exigences relatives und Anforderungen
à leur échange für ihren Datenaustausch
(CEI 81714-2:2006) (IEC 81714-2:2006)

This European Standard was approved by CENELEC on 2006-10-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 81714-2:2007 E
Foreword
The text of the International Standard IEC 81714-2:2006, prepared by IEC TC 3, Information structures,
documentation and graphical symbols, in cooperation with ISO subcommittee SC 1, Basic conventions, of
ISO technical committee 10, Technical product documentation, was submitted to the formal vote and was
approved by CENELEC as EN 81714-2 on 2006-10-01 without any modification.
This European Standard supersedes EN 81714-2:1998.
The main changes with respect to EN 81714-2:1998 are as follows:
Subclauses 6.16, 6.18 and Annex D contain the major changes; other changes are basically updates.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2007-10-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2009-10-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 81714-2:2006 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:
ISO 10303-1 NOTE  Harmonized as ENV ISO 10303-1:1995 (not modified).
ISO 10303-11 NOTE  Harmonized as ENV ISO 10303-11:1995 (not modified).
ISO 10303-21 NOTE  Harmonized as ENV ISO 10303-21:1995 (not modified).
IEC 60445 NOTE  Harmonized as EN 60445:2000 (not modified).
__________
- 3 - EN 81714-2:2007
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application 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.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

IEC 60617 Data- Graphical symbols for diagrams - -
base
1) 2)
IEC 61082-1 - Preparation of documents used in EN 61082-1 2006
electrotechnology -
Part 1: Rules
IEC 61286 (mod) 2001 Information technology - Coded graphic EN 61286 2002
character set for use in the preparation of
documents used in electrotechnology and for
information interchange
IEC 61346-1 1996 Industrial systems, installations and EN 61346-1 1996
equipment and industrial products -
Structuring principles and reference
designations -
Part 1: Basic rules
IEC 61346-2 2000 Industrial systems, installations and EN 61346-2 2000
equipment and industrial products -
Structuring principles and reference
designations -
Part 2: Classification of objects and codes for
classes
IEC 61360-1 2002 Standard data element types with associated EN 61360-1 2002
A1 2003 classification scheme for electric A1 2004
components -
Part 1: Definitions - Principles and methods

1) 2)
IEC 61360-4 - Standard data element types with associated EN 61360-4 2005
classification scheme for electric + corr. December 2005
components -
Part 4: IEC reference collection of standard
data element types and component classes

IEC 61666 1997 Industrial systems, installations and EN 61666 1997
equipment and industrial products -
Identification of terminals within a system

1)
Undated reference.
2)
Valid edition at date of issue.

Publication Year Title EN/HD Year
IEC 61966-2-1 1999 Multimedia systems and equipment - Colour EN 61966-2-1 2000
measurement and management -
Part 2-1: Colour management - Default RGB
colour space - sRGB
IEC 81714-3 2004 Design of graphical symbols for use in the - -
technical documentation of products -
Part 3: Classification of connect nodes,
networks and their encoding
ISO/IEC 646 1991 Information technology - ISO 7-bit coded - -
character set for information interchange

ISO/IEC 7942-1 1994 Information technology - Computer graphics EN ISO/IEC 7942-1 1995
and image processing - Graphical Kernel
System (GKS) -
Part 1: Functional description

ISO/IEC 9592-1 1997 Information technology - Computer graphics - -
and image processing - Programmer's
Hierarchical Interactive Graphics System
(PHIGS) -
Part 1: Functional description

ISO 128-20 1996 Technical drawings - General principles of EN ISO 128-20 2001
presentation -
Part 20: Basic conventions for lines

ISO 128-21 1997 Technical drawings - General principles of EN ISO 128-21 2001
presentation -
Part 21: Preparation of lines by CAD systems

ISO 639-1 2002 Codes for the representation of names of - -
languages -
Part 1: Alpha-2 code
ISO 3098-0 1997 Technical product documentation - Lettering - EN ISO 3098-0 1997
Part 0: General requirements
ISO 3098-5 1997 Technical product documentation - Lettering - EN ISO 3098-5 1997
Part 5: CAD lettering of the Latin alphabet,
numerals and marks
ISO 3166-1 1997 Codes for the representation of names of EN ISO 3166-1 1997
countries and their subdivisions -
Part 1: Country codes
ISO 6428 1982 Technical drawings - Requirements for EN ISO 6428 1999
microcopying
ISO 6523-1 1998 Information technology - Structure for the - -
identification of organizations and
organization parts -
Part 1: Identification of organization
identification schemes
ISO 10303-201 1994 Industrial automation systems and ENV ISO 10303-201 1995
integration - Product data representation and
exchange -
Part 201: Application protocol: Explicit
draughting
- 5 - EN 81714-2:2007
Publication Year Title EN/HD Year
ISO 81714-1 1999 Design of graphical symbols for use in the EN ISO 81714-1 1999
technical documentation of products -
Part 1: Basic rules
NORME CEI
INTERNATIONALE
IEC
81714-2
INTERNATIONAL
Deuxième édition
STANDARD
Second edition
2006-06
Création de symboles graphiques utilisables
dans la documentation technique de produits –
Partie 2:
Spécification pour symboles graphiques
sous forme adaptée à l'ordinateur, y compris
les symboles pour bibliothèque de références
et exigences relatives à leur échange

Design of graphical symbols for use in the
technical documentation of products –
Part 2:
Specification for graphical symbols in a computer
sensible form, including graphical symbols
for a reference library, and requirements for
their interchange
 IEC 2006 Droits de reproduction réservés  Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
CODE PRIX
XC
PRICE CODE
Pour prix, voir catalogue en vigueur
For price, see current catalogue

81714-2  IEC:2006 – 3 –
CONTENTS
FOREWORD.9

1 Scope.15
2 Normative references .15
3 Terms and definitions .19
3.1 Graphical symbols for use on documents .19
3.2 Nodes .19
3.3 Administration of openings .21
3.4 Graphical constructs.23
3.5 Routing and placing of graphical symbols in diagrams.23
3.6 Administration of graphical symbols .23
3.7 Text.25
4 Markers .27
4.1 Markers for reference points and connect nodes .27
4.2 Markers for alignment of text .27
5 Reference symbols.27
6 Specifications for symbols including symbols for a reference library .29
6.1 General .29
6.2 Variants of graphical symbols.31
6.3 Scaling .35
6.4 Module sizes in reference libraries .37
6.5 Use of layer technique.39
6.6 Constructs used in the creation of graphical symbols .39
6.7 Text.43
6.8 Connect nodes .49
6.9 Reference point of reference symbols .57
6.10 Identification of schematic connect nodes .59
6.11 Routing and placing of symbols .61
6.12 Identifying block .65
6.13 Descriptive data block .65
6.14 Defaulted location of identifying and descriptive block.69
)
6.15 Creation of reference symbols not shown in IEC 60617 nor in ISO 14617 .69
6.16 Classification of graphical symbols .71
6.17 Description of symbols .73
6.18 Reference symbol identifier .75

)
Annex A (informative) Relations to IEC 60617 and ISO 14617 .79
Annex B (informative) Interchange of diagrams and symbol libraries.81
Annex C (informative) Application reference model.89
Annex D (informative) Product identification .129
Annex E (normative) Data types, value formats, recommended lengths, defaults .131
Annex F (normative) Requirements concerning lines.137
Annex G (normative) Requirements concerning text.143

81714-2  IEC:2006 – 5 –
Annex H (informative) Examples of pattern definitions .151
Annex I (normative) Library versions – Conformance requirements.155
Annex J (normative) Requirements concerning global definitions in a library.157
Annex K (informative) Data element type specification.161

Bibliography.169

Figure 1 – Examples of presentation of connect node linkage .21
Figure 2 – Encoding of text alignment .27
Figure 3 – Variants of a graphical symbol .31
Figure 4 – Example of variants of a graphical symbol representing a thyristor.33
Figure 5 – Example of variants of a graphical symbol representing a variable resistor
showing terminal designations with respect to the product aspect.33
Figure 6 – Example of variants of a graphical symbol representing a resistor.35
Figure 7 – Graphical symbols indicating a delayed action .35
Figure 8 – Example of enlarging a symbol with a scaling factor 1:2.37
Figure 9 – Example of a change of the module size .39
Figure 10 – Example of use of the spline function .41
Figure 11 – Recommended colours.41
Figure 12 – General labels in graphical symbols and their alignment .47
Figure 13 – Use of general labels in graphical symbols.47
Figure 14 – Examples of location of schematic connect nodes .49
Figure 15 – Examples of locations of schematic connect nodes .51
Figure 16 – Example of position of the textfield for product terminal designations .53
Figure 17 – Example of position of the textfield for product terminal designations for
symbols without terminal lines .55
Figure 18 – Example of position of the textfields for product terminal and function
terminal designations.55
Figure 19 – Reference point of symbols .57
Figure 20 – Connect node identification .59
Figure 21 –Schematic connect node identification.59
Figure 22 – Examples of embedded areas .61
Figure 23 – Examples of sectors for drawing connecting lines onto a schematic
connect node .61
Figure 24 – Example of graphical swapping of schematic connect nodes .63
Figure 25 – Example of graphical swapping of schematic connect nodes .63
Figure 26 – Sequence and justification of the textfields associated with the identifying
block.65
Figure 27 – Justification and sequence of the textfields associated with the descriptive
block.67
Figure 28 – Example of defaulted locations of ib, db, and textfield for the product
terminal designation.69
Figure 29 – Examples taken from the section on recording, integrating and measuring
instruments.71

81714-2  IEC:2006 – 7 –
Figure 30 – Structure of the symbol identifier.75
Figure 31 – Examples of symbol identifiers of reference symbols.77
Figure B.1 – Data interchange .83
Figure C.1 – EXPRESS-G model of the graphical part of a symbol.91
Figure C.2 – Hatching patterns .99
Figure C.3 – EXPRESS–G model concerning text requirements.103
Figure C.4 – EXPRESS–G symbol part .109
Figure C.5 – Symbol variant text block part.123
Figure F.1 – Line end types and their codes .139
Figure F.2 – Line corner types and their codes .141
Figure F.3 – Grouping of lines.141
Figure G.1 – Character slant angle .143
Figure G.2 – Character spacing .145
Figure G.3 – Tabular lettering .145
Figure G.4 – Examples of proportional lettering with different character spacing.147
Figure G.5 – Possible alignments of a textstring using a character slant angle of 0° and
a rotation of 0°.149

81714-2  IEC:2006 – 9 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DESIGN OF GRAPHICAL SYMBOLS FOR USE
IN THE TECHNICAL DOCUMENTATION OF PRODUCTS –

Part 2: Specification for graphical symbols in a computer sensible form,
including graphical symbols for a reference library, and requirements
for their interchange
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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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 81714-2 has been prepared by IEC technical committee 3:
Information structures, documentation and graphical symbols in cooperation with ISO
subcommittee SC 1: Basic conventions of ISO technical committee 10: Technical product
documentation.
This publication is published as a double logo standard.
This second edition cancels and replaces the first edition published in 1998. It constitutes a
technical revision. The main changes with respect to the previous edition are as follows:
Subclauses 6.16, 6.18 and Annex D contain the major changes; other changes are basically
updates.
81714-2  IEC:2006 – 11 –
The text of this standard is based on the following documents of IEC:
CDV Report on voting
3/738/CDV 3/760A/RVC
Full information on the voting for the approval of this part of this standard can be found in the
report on voting indicated in the above table. In ISO, the standard has been approved by 8 P
members out of 8 having cast a vote.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
In order to collect all requirements concerning relevant graphical symbols within one single
numerical series, IEC technical committee 3 in conjunction with ISO technical committee 10:
Technical product documentation, agreed to publish all parts of this International Standard
within the 81714 series.
The Technical Management Board of ISO and the Standardization Management Board of IEC
have decided that, for each part of this series, one organization shall be chosen responsible.
The technical committees involved have agreed not to change any part of International
Standard 81714 without mutual agreement.
International Standard 81714 consists of the following parts, under the general title Design of
graphical symbols for use in the technical documentation of products:
Part 1: Basic rules (published by ISO)
Part 2: Specification for graphical symbols in a computer sensible form, including graphical
symbols for a reference library, and requirements for their interchange
(published by IEC)
Part 3: Classification of connect nodes, networks and their encoding
(published by IEC)
Part 2 serves as the basis for the design of graphical symbols for use in CAx-systems in all
fields of the technical documentation of products. Applications of the standard are, for
example, IEC 60617 and ISO 14617 as well as the web based databases of those standards.
st
This standard has been updated and is kept compatible with the 1 edition of this part of IEC
81714.
Annex A describes the relations between this standard, IEC 60617 and the edition of
ISO 14617 [8] .
Annex B contains information concerning the interchange of graphical symbol libraries among
computer-aided systems.
Annex C contains the EXPRESS-G [2] ,[12] model of the requirements specified in this
standard.
Annex E lists data types, recommended lengths and default values of the attributes used in
the EXPRESS–G model of annex D.
———————
)
Figures in square brackets refer to the bibliography.

81714-2  IEC:2006 – 13 –
Annex F contains requirements concerning lines actually not included in the present edition of
the ISO 128 series.
Annex G contains requirements concerning text actually not included in the present editions of
ISO 3098-0:1997 and 3098-5:1997.
Annex H specifies predefined hatching patterns for possible use in drawings and graphical
symbols.
Annex I contains a description of different library versions which may be produced by
implementing this standard.
Annex J contains requirements concerning global definitions of graphical symbols within a
library.
Annex K specifies examples of data element types used in the context of IEC 60617.
A bibliography exists at the end of this standard.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result 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.
81714-2  IEC:2006 – 15 –
DESIGN OF GRAPHICAL SYMBOLS FOR USE
IN THE TECHNICAL DOCUMENTATION OF PRODUCTS –

Part 2: Specification for graphical symbols in a computer sensible form,
including graphical symbols for a reference library, and requirements
for their interchange
1 Scope
This part of International Standard 81714 specifies requirements for graphical symbols to be
included in a reference symbol library in a computer sensible form, and requirements for their
interchange among computer aided tools. The reference symbol library may be used as a
basis for the design and editing of documents, and for the interchange of documents and
graphical symbol libraries among computer-aided tools.
The specification of a physical file format required for the interchange is not included in this
standard.
2 Normative references
The following referenced documents are indispensable for the application 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.
IEC 60617-DB, Graphical symbols for diagrams
IEC 61082-1, Preparation of documents used in electrotechnology – Part 1: General
requirements
IEC 61286:2001, Information technology – Coded graphic character set for use in the
preparation of documents used in electrotechnology and for information interchange
IEC 61346-1:1996, Industrial systems, installations and equipment, and industrial products –
Structuring principles and reference designations – Part 1: Basic rules
IEC 61346-2:2000, Industrial systems, installations and equipment, and industrial products –
Structuring principles and reference designations – Part 2: Classification of objects and codes
for classes
IEC 61360-1:2004, Standard data element types with associated classification scheme for
electric components – Part 1: Definitions – Principles and methods
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
81714-2  IEC:2006 – 17 –
IEC 61666:1997, Industrial systems, installations and equipment and industrial products –
Identification of terminals within a system
IEC 61966-2-1:1999, Multimedia systems and equipment – Colour measurement and
management – Part 2-1: Colour management – Default RGB colour space – sRGB
IEC 81714-3:2004, Design of graphical symbols for use in the technical documentation of
products – Part 3: Classification of connect nodes, networks and their encoding
ISO/IEC 646:1991, Information technology – ISO 7-bit coded character set for information
interchange
ISO/IEC 7942-1:1994, Information technology – Computer graphics and image processing –
Graphical Kernel System (GKS) – Part 1: Functional description
ISO/IEC 9592-1:1997, Information technology – Computer graphics and image processing –
Programmer’s Hierarchical Interactive Graphics System (PHIGS) – Part 1: Functional
description
ISO 128-20:1996, Technical drawings – General principles of presentation – Part 20: Basic
conventions for lines
ISO 128-21:1997, Technical drawings – General principles of presentation – Part 21:
Preparation of lines by CAD-systems
ISO 639-1:2002, Codes for the representation of names of languages – Part 1: Alpha-2-code
ISO 3098-0:1997, Technical product documentation – Lettering – Part 0: General
requirements
ISO 3098-5:1997, Technical product documentation – Lettering – Part 5: CAD lettering of the
Latin alphabet, numerals and marks
ISO 3166-1:1997, Codes for the representation of names of countries and their subdivisions –
Part 1: Country codes
ISO 6428:1982, Technical drawings – Requirements for micro copying
ISO 6523-1:1998, Information technology – Structure for the identification of organizations
and organization parts –Part 1: Identification of organization identification schemes
ISO 10303-201:1994, Industrial automation systems and integration – Product data
representation and exchange – Part 201: Application protocol: Explicit draughting
ISO 81714-1:1999, Design of graphical symbols for use in the technical documentation of
products – Part 1: Basic rules

81714-2  IEC:2006 – 19 –
3 Terms and definitions
For the purposes of this document, and in addition to the definitions contained in ISO 81714-1
and IEC 61346-1, the following terms and definitions apply.
3.1 Graphical symbols for use on documents
3.1.1
function symbol
graphical symbol representing an object with a defined behaviour, and provided with input and
output functional nodes
NOTE Example of function symbol: the symbol S01567 in IEC 60617 for an AND-function.
3.1.2
product symbol
graphical symbol representing an object with a defined behaviour, and provided with nodes,
specifically implemented in either hardware or software
NOTE Example of product symbol: the symbol S01579 of IEC 60617 for an AND-gate with negated output (part of
SN7410).
3.1.3
graphical symbol occurrence
graphical symbol presented in a diagram including the presentation of data associated with
the object being represented
3.1.4
reference symbol
graphical symbol unambiguously identified and provided with openings for presentation of
data associated with an object represented in a diagram by a graphical symbol occurrence
NOTE Examples for graphical symbols equipped with openings are shown in Figures 12 and 13.
3.2 Nodes
3.2.1
connect node; port; terminal
point of access of an object intended for connection
NOTE The connection may refer to
a) a physical interface among conductors and/or contacts, or piping and/or duct systems to provide a signal or
energy or material flow path;
b) an association of functional nature established among logical elements, software modules, etc. for conveying
information.
3.2.2
(schematic) connect node
location on a graphical symbol intended for connection
NOTE 1 (Schematic) connect nodes represent the terminals of the object of interest.
NOTE 2 A (schematic) connect node may not have a graphical shape. It may consist of an imaginary point
associated with a graphical symbol.
3.2.3
node name
identification of a connect node.
3.2.4
coded connect node class
encoded classification of a connect node

81714-2  IEC:2006 – 21 –
3.2.5
(schematic) electrical node
connect node designed for connecting to a representation of an electrical network
3.2.6
(schematic) functional node
connect node designed for connecting to a representation of a functional network
3.2.7
(schematic) linkage node
connect node designed for connecting to a representation of a mechanical linkage network
NOTE Figure 1 shows examples of linkage nodes and networks.

Figure 1 – Examples of presentation of connect node linkage
3.2.8
(schematic) matter node
connect node designed for connecting to a representation of a network intended for transport
of matters
NOTE Matters are gas, fluid or solid.
3.2.9
(schematic) optical node
connect node designed for connecting to a representation of an optical fibre network
3.2.10
(schematic) wave node
connect node designed for connecting to a representation of a wave propagation network
NOTE Examples of wave propagation networks: infrared light, radio transmission.
3.3 Administration of openings
3.3.1
opening
definition of a possibility to enter information associated with the object being represented by
a graphical symbol occurrence
3.3.2
descriptive block
openings intended for the presentation of descriptive information

81714-2  IEC:2006 – 23 –
3.3.3
identifying block
openings intended for the presentation of reference designations
3.3.4
connect block
openings intended for the presentation of data associated with a connect node
3.3.5
text
collection of alphabetical, numerical and/or other characters conveying human interpretable
information
3.4 Graphical constructs
3.4.1
graphical primitives
constructs like lines, circular arcs, polylines, ellipsis, etc., needed to draw a figure in a
computer-aided drawing system
3.4.2
scaling factor
factor by which the coordinates of all defined points of the symbol will be enlarged or reduced
in size in relation to the reference point of the symbol
3.5 Routing and placing of graphical symbols in diagrams
3.5.1
embedded area
area containing the graphical symbol
3.5.2
connecting line directions
specification of directions under which connecting lines may be drawn onto a schematic
connect node
3.6 Administration of graphical symbols
3.6.1
layer
self-contained group of data that can be manipulated or displayed individually
3.6.2
symbol classification
classification of an object represented by a graphical symbol
3.6.3
symbol classification code
encoded classification of an object represented by a graphical symbol
3.6.4
symbol description
textual description of the meaning of a graphical symbol
3.6.5
symbol name
identifier of a graphical symbol within a symbol library

81714-2  IEC:2006 – 25 –
3.6.6
symbol type
attribute for a classification of a graphical symbol used, e.g. for a simplified management of
symbols in CAE-systems and allowing special evaluations (e.g. for terminals, devices,
detached representation, attached representation, etc.)
3.6.7
variant name
identifying name of a variant of a symbol
3.7 Text
3.7.1
character body
rectangle used to enclose a single character shape
NOTE All character bodies of the same type face have the same height (see ISO 7942).
3.7.2
character aspect ratio [ISO 10303-201];
character expansion factor [ISO/IEC 9592-1]
relation of width to height of a character body
3.7.3
character justification
alignment of a character in its character body
[ISO/IEC 9592-1]
3.7.4
character spacing factor
space between sequent character bodies
[ISO/IEC 9592-1]
3.7.5
tabular lettering
lettering with characters having a constant width of all character bodies
NOTE The width of the character body is defined by its width to height (b/h) ratio.
3.7.6
proportional lettering
lettering with characters having individual width of character bodies
NOTE The width of the character body is defined by the appearance of the character.
3.7.7
line distance factor
factor defining the distance between succeeding base lines of a text in relation to the lettering
height of the characters
81714-2  IEC:2006 – 27 –
4 Markers
4.1 Markers for reference points and connect nodes
In this standard the following markers are used for documentation purposes.
Reference point Connect node
Reference point and connect node

Where it is necessary to specify in this standard the type of a (schematic) connect node, the
asterisk (*) is replaced by the letter code indicating the type according to IEC 81714-3.
4.2 Markers for alignment of text
For the documentation of alignment and reading direction of connect block, descriptive block,
identifying block and textfields, the following markers are used in this standard. In accordance
with ISO 3098-5 each alignment is encoded by a number as shown in Figure 2. See also
Annex G.
Top
Centre
Bottom
Left Centre Right
Figure 2 – Encoding of text alignment
5 Reference symbols
Good and user-oriented documentation of products is of vital interest to users. As the
preparation of documentation is an essential cost factor, companies preparing documentation
aim to prepare documentation at low cost, with a minimum of time and in sufficient and
consistent quality. Therefore, it is of high industrial interest to have a very efficient tool for the
preparation of such documentation.
Diagrams contain a number of graphical symbols, each symbol associated with the
presentation of other information belonging to the object being represented. In the preparation
of graphical symbols, attention shall be given, concerning the readability of this information, to
different flow directions of information and/or energy in the diagram, and to the overall
understanding of the diagram. In order to reduce the amount of work in the preparation of
diagrams, graphical symbols are stored in symbol libraries.
In a diagram, only an occurrence of the definition of a graphical symbol contained in a library
is used. By this method, the system need not incorporate a graphical symbol as an embedded
object within the diagram. If used in a diagram, it simply refers to the relevant symbol
definition in the relevant library. This is an effective method of keeping data volume of a
diagram very low.
81714-2  IEC:2006 – 29 –
The graphical symbol definition contained in a library does not know where it will be applied.
Therefore the variable data belonging to the object of interest that the graphical symbol is
intended to represent, need to be entered when occurring (presented) on a diagram and will
then be associated with the diagram. Data associated with the occurrence of a symbol in a
diagram will normally override possible defaults specified in the symbo
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