IEC 61666:2010

Industrial systems, installations and equipment and industrial products - Identification of terminals within a system

IEC 61666:2010 establishes general principles for the identification of terminals of objects within a system, applicable to all technical areas (for example mechanical engineering, electrical engineering, construction engineering, process engineering). They can be used for systems based on different technologies or for systems combining several technologies. This second edition cancels and replaces the first edition of IEC 61666 published in 1997 and edition constitutes a technical revision. It includes the following substantial changes with respect to the previous edition:
- the terminology used in the publication has been adapted to the one used in IEC 81346-1 Ed. 2;
- a more comprehensive description of the designation principles is provided;
- additional examples illustrating terminal designations related to the function aspect and location aspect are provided;
- an additional example illustrating the use of terminal designation sets is provided;
- the former informative Annex A has been turned into a clause in the standard.
IEC 61666:2010 has the status of a horizontal standard in accordance with IEC Guide 108

Systèmes industriels, installations et appareils, et produits industriels - Identification des bornes dans le cadre d'un système

L'IEC 61666:2010 établit les principes généraux en vue de l'identification des bornes des objets à l'intérieur d'un système, applicables à tous les domaines techniques (par exemple l'ingénierie mécanique, l'ingénierie électrique, l'ingénierie de la construction, l'ingénierie des procédés). Ils peuvent être appliqués à des systèmes reposant sur des techniques différentes ou combinant plusieurs techniques. Les exigences relatives au marquage des désignations de bornes sur les produits ne font pas partie de la présente publication. Cette deuxième édition annule et remplace la première édition publiée en 1997. Cette édition constitue une révision technique. Cette édition inclut les modifications substantielles suivantes par rapport à l'édition précédente:
- la terminologie utilisée dans la publication a été adaptée à celle utilisée dans l'IEC 81346-1 Ed. 2;
- une description plus complète des principes de désignation est fournie;
- des exemples additionnels illustrant des désignations de bornes se rapportant à l'aspect de fonction et l'aspect d'emplacement sont fournis;
- un exemple additionnel illustrant l'utilisation des ensembles de désignation de bornes est fourni;
- l'ancienne Annexe A (informative) a été transformée en un article de la norme.
L'IEC 61666:2010 a le statut de norme horizontale conformément au Guide IEC 108.

General Information

• Status: Published
• Publication Date: 18-Aug-2010
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 01.080.30 - Graphical symbols for use on mechanical engineering and construction drawings, diagrams, plans, maps and in relevant technical product documentation
• Technical Committee: TC 3 - Documentation, graphical symbols and representations of technical information
• Current Stage: PPUB - Publication issued
• Start Date: 19-Aug-2010
• Completion Date: 19-Aug-2010

Standards Content (sample)

IEC 61666
Edition 2.0 2010-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
HORIZONTAL STANDARD
NORME HORIZONTALE
Industrial systems, installations and equipment and industrial products –
Identification of terminals within a system
Systèmes industriels, installations et appareils, et produits industriels –
Identification des bornes dans le cadre d’un système
IEC 61666:2010
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61666
Edition 2.0 2010-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
HORIZONTAL STANDARD
NORME HORIZONTALE
Industrial systems, installations and equipment and industrial products –
Identification of terminals within a system
Systèmes industriels, installations et appareils, et produits industriels –
Identification des bornes dans le cadre d’un système
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 01.080.30 ISBN 978-2-88912-148-9
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – 61666 © IEC:2010
CONTENTS

FOREWORD...........................................................................................................................3

1 Scope...............................................................................................................................5

2 Normative references .......................................................................................................5

3 Terms and definitions .......................................................................................................5

4 Terminal designation ........................................................................................................7

4.1 General ...................................................................................................................7

4.2 Designation of terminals with respect to the product aspect.....................................8

4.3 Designation of terminals with respect to the function aspect ....................................9

4.4 Designation of terminals with respect to the location aspect ..................................10

4.5 Terminal designation set .......................................................................................11

5 Classification of terminals...............................................................................................13

Annex A (informative) Examples of terminal designations not specified by a

manufacturer ........................................................................................................................14

Bibliography..........................................................................................................................16

Figure 1 – Principle of terminal designation ............................................................................7

Figure 2 – Example of designation of terminals for a 3-phase squirrel-cage motor ..................9

Figure 3 – A device shown with function labels on which the terminal designations

related to the function aspect are based, as well as terminal designations (pins) related

to the product aspect ............................................................................................................10

Figure 4 – Example of a symbol for a motor starter provided with terminal designations

related to the function aspect................................................................................................10

Figure 5 – Example of a terminal board for cross-connection where the terminals are

designated related to their location aspect ............................................................................11

Figure 6 – Example of a terminal designation set..................................................................12

Figure 7 – Example of a design with terminal designations related to the function

aspect...................................................................................................................................12

Figure 8 – Example of an implemented design based on Figure 7 with terminal

designations related to the product aspect............................................................................13

Figure 9 – Example of an implemented design based on Figure 7 with terminal

designation sets related to the function and product aspects ................................................13

Figure A.1 – Four terminal blocks composing one terminal assembly (each terminal

block is considered as an object) ..........................................................................................14

Figure A.2 – One terminal block with eight terminals (the complete unit is an object) ............15

Figure A.3 – One terminal block with eight terminals with two entry points each ...................15

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61666  IEC:2010 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL SYSTEMS, INSTALLATIONS
AND EQUIPMENT AND INDUSTRIAL PRODUCTS –
IDENTIFICATION OF TERMINALS WITHIN A SYSTEM
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

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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

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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 61666 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.

This second edition cancels and replaces the first edition of IEC 61666 published in 1997.

This edition constitutes a technical revision.

This edition includes the following substantial changes with respect to the previous edition:

 the terminology used in the publication has been adapted to the one used in IEC 81346-1 Ed.2;

 a more comprehensive description of the designation principles is provided;

 additional examples illustrating terminal designations related to the function aspect and

location aspect are provided;

 an additional example illustrating the use of terminal designation sets is provided;

 the former informative Annex A has been turned into a clause in the standard.
---------------------- Page: 5 ----------------------
– 4 – 61666 © IEC:2010
The text of this standard is based on the following documents:
FDIS Report on voting
3/1001/FDIS 3/1008/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.

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.
---------------------- Page: 6 ----------------------
61666 © IEC:2010 – 5 –
INDUSTRIAL SYSTEMS, INSTALLATIONS
AND EQUIPMENT AND INDUSTRIAL PRODUCTS –
IDENTIFICATION OF TERMINALS WITHIN A SYSTEM
1 Scope

This International Standard establishes general principles for the identification of terminals of

objects within a system, applicable to all technical areas (for example mechanical

engineering, electrical engineering, construction engineering, process engineering). They can

be used for systems based on different technologies or for systems combining several

technologies.

Requirements for marking of terminal designations on products are not part of this publication.

NOTE The standard is based on the general principles for the structuring of systems including structuring of the

information about systems, established in the International Standard ISO/IEC 81346 series, published jointly by

IEC and ISO.
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 60417, Graphical symbols for use on equipment

IEC 60445, Basic and safety principles for man-machine interface, marking and identification

– Identification of equipment terminals and conductor terminations
IEC 60757, Code for designation of colours

IEC 61082-1:2006, Preparation of documents used in electrotechnology – Part 1: Basic rules

IEC 81346-1, Industrial systems, installations and equipment and industrial products –

Structuring principles and reference designations – Part 1: Rules

IEC 81714-3, Design of graphical symbols for use in the technical documentation of products

– Part 3: Classification of connect nodes, networks and their encoding
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
object
entity treated in a process of development, implementation, usage and disposal

NOTE 1 The object may refer to a physical or non-physical “thing”, i.e. anything that might exist, exists or did

exist.
NOTE 2 The object has information associated to it..
[IEC 81346-1, definition 3.1]
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– 6 – 61666 © IEC:2010
3.2
system

set of interrelated objects considered in a defined context as a whole and separated from their

environment

NOTE 1 A system is generally defined with the view of achieving a given objective, e.g. by performing a definite

function.

NOTE 2 Elements of a system may be natural or man-made material objects, as well as modes of thinking and the

results thereof (e.g. forms of organisation, mathematical methods, programming languages).

NOTE 3 The system is considered to be separated from the environment and from the other external systems by

an imaginary surface, which cuts the links between them and the system.

NOTE 4 The term “system” should be qualified when it is not clear from the context to what it refers, e.g. control

system, colorimetric system, system of units, transmission system.

NOTE 5 When a system is part of another system, it may be considered as an object as defined in this standard.

[IEV 151-11-27, modified]
3.3
aspect
specified way of viewing an object
[IEC 81346-1, definition 3.3]
3.4
function
intended or accomplished purpose or task
[IEC 81346-1, definition 3.5]
3.5
product
intended or accomplished result of labour, or of a natural or artificial process
[IEC 81346-1, definition 3.6]
3.6
component
product used as a constituent in an assembled product, system or plant
[IEC 81346-1, definition 3.7]
3.7
identifier

attribute associated with an object or system to unambiguously distinguish it from other

objects or systems within a specified domain
[IEC 81346-1, definition 3.10, modified]
3.8
reference designation

identifier of a specific object formed with respect to the system of which the object is a

constituent, based on one or more aspects of that system
[IEC 81346-1, definition 3.11]
3.9
terminal
point of access to an object intended for connection to an external network
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61666 © IEC:2010 – 7 –

NOTE 1 The connection may refer to: a) a physical interface between conductors and/or contacts, or piping

and/or duct systems to provide a signal, energy or material flow path; b) an association of functional nature

established between logical elements, software modules, etc. for conveying information.

NOTE 2 The external networks may be of different nature and accordingly they may be classified. IEC 81714-3

provides such classifications.
3.10
terminal designation

identifier of a terminal with respect to the object to which it belongs, related to one defined

aspect
3.11
terminal designation set

group of terminal designations, each identifying the same terminal from different aspects

3.12
object designation
identifier of a specific object in a given context

NOTE Examples of such designations are: reference designation, type number, serial number, name.

[IEC 61355, 3.13]
4 Terminal designation
4.1 General

Terminals establish the interface of objects for connecting them to other objects in a network,

for example connecting to an electrical network, logic function network, logic network in

software, piping network, etc.
An object may be associated with any number of terminals.

Each terminal shall be unambiguously identified with respect to the object itself as well as to

the system to which this object belongs.

Figure 1 illustrates the principle of constructing an unambiguous terminal designation.

IEC 1956/10
Figure 1 – Principle of terminal designation
---------------------- Page: 9 ----------------------
– 8 – 61666 © IEC:2010

The terminal designation shall consist of the terminal marking as defined by the manufacturer

or designer of the object used as component in the system or of the identifier as defined in

the documentation of the object.

If it is necessary to indicate the aspect of the terminal that the terminal designation relates to

(for example within human readable presentations), the terminal designation shall be

preceded by a prefix sign identifying the aspect.
NOTE 1 This prefix sign will exist in addition to the separator sign.
NOTE 2 The prefix sign is considered to be part of the terminal designation.
The terminal designation shall be formed according to 4.2, 4.3, or 4.4.

The terminal designation shall be presented, in documentation, in accordance with

IEC 61082-1.

The object designation shall unambiguously identify the object to which a terminal is

assigned. This implies that an object designation shall be (or be made) unambiguous in a

specified context, i. e. within the considered network.

NOTE 3 This requirement can be fulfilled by reference designations in accordance with IEC 81346-1 and such

designations are therefore used in the following text.
4.2 Designation of terminals with respect to the product aspect

A terminal designation provided with respect to the product aspect shall consist of the

designation of the physical terminal that is:
• marked on the product; or
• assigned by the manufacturer; or
• defined in relevant IEC publications; or
• known from convention.

Examples of the three last possibilities are a dual-in-line package or a contactor.

NOTE 1 Some product standards such as IEC 60034-8, IEC 60191-3 and IEC 60616 include requirements for

terminal markings of products.

If indication of the product aspect is needed in the terminal designation, the prefix sign “-“

shall be applied.
NOTE 2 The prefix sign is considered to be part of the terminal designation.

If there is no designation of the physical terminal assigned by the manufacturer of the

product, arbitrary terminal designations shall be assigned and shall be explained in the

document or in supporting documentation. The same applies also if the designation assigned

by the manufacturer is, for some reason, insufficient for unambiguous identification. See also

Annex A .

If the designation of the physical terminal has the form of a graphical symbol or colour, an

equivalent standardized letter symbol may be used in the documentation, for example, PE

instead of the graphical symbol for protective earth (see IEC 60445), BU for blue colour.

Letter codes for colours shall be in accordance with IEC 60757.
Figure 2 shows an example of designation of terminals for a motor.
---------------------- Page: 10 ----------------------
61666 © IEC:2010 – 9 –
IEC 1957/10
Figure 2 – Example of designation of terminals for a 3-phase squirrel-cage motor
4.3 Designation of terminals with respect to the function aspect

A terminal designation provided with respect to the function aspect shall consist of a

designation based on the function(s) related to the terminal.

For functions of devices described by a data sheet or similar supporting document, a function

terminal designation should be based on the function label associated with terminal name

defined in the data sheet or the similar supporting document.

NOTE 1 Such terminal designations are for example defined in accordance with application note A00317 of

IEC 60617-S00317 (2001-07).

NOTE 2 Examples in IEC 60617 do not always provide labels that are unambiguous function terminal

designations. Whenever used as terminal designations, such labels need to be made unambiguous.

If indication of the function aspect is needed in the terminal designation, the prefix sign “=“

shall be applied.
NOTE 3 The prefix sign is considered to be part of the terminal designation.

Figure 3 shows an example of a device with function labels and terminal markings of the

terminals shown.
---------------------- Page: 11 ----------------------
– 10 – 61666 © IEC:2010
RAM 16x4
Function label on which
1C2[WRITE]
Terminal designation the terminal designation
1EN[READ]
(2) related to the (G1) related to the
product aspect G1 function aspect is based
4 5
A, 2D
6 7
10 9
12 11
IEC 1958/10
Figure 3 – A device shown with function labels on which the terminal
designations related to the function aspect are based, as well as terminal
designations (pins) related to the product aspect

Figure 4 shows an example of a motor starter used as component with known functionality but

unknown physical implementation (i.e. the product to be used has not yet been selected). The

terminal designations are assigned from the function aspect by the designer of the complete

system in which such a motor starter may form part. These designations are used during the

system design and, during the detailed engineering, supplemented or replaced (by computer-

aided automatic means) by the terminal designations from the product aspect assigned by the

manufacturer of the product used for the implementation in each specific case.
NOTE 4 Clause 11 of IEC 61082-1 describes a mapping method for this.
IEC 1959/10
Figure 4 – Example of a symbol for a motor starter provided
with terminal designations related to the function aspect
4.4 Designation of terminals with respect to the location aspect

A terminal designation provided with respect to the location aspect shall consist of a

designation based on the location related to the terminal.

If the indication of the location aspect is needed in the terminal designation, the prefix sign “+“

shall be applied.
---------------------- Page: 12 ----------------------
61666 © IEC:2010 – 11 –
NOTE 1 The prefix sign is considered to be part of the terminal designation.

The method used (e.g. a grid system) for location designation of terminals should be

explained in the document or in supporting documentation.

NOTE 2 Some methods for assigning location designations are provided in IEC 81346-1.

Figure 5 shows an example of a terminal board used for cross connection with a number of

terminals organized in a matrix where the rows along the x-axis are identified by letters and

the rows along the y-axis by numbers. Any terminal on the board can be identified by its xy

position.
IEC 1960/10
Figure 5 – Example of a terminal board for cross-connection
where the terminals are designated related to their location aspect
4.5 Terminal designation set

A terminal of an object can be associated with more than one terminal designation, and the

object to which the terminal belongs can at the same time be associated with a reference

designation set. This means that basically each member of the reference designation set can

be combined with each of the different terminal designations, each combination establishing

an identifying “terminal designation within a system”. If more than one of these terminal

designations needs to be indicated together, a terminal designation set shall be provided.

For a terminal designation set the following applies:

• each terminal designation shall be constructed according to the rules defined in 4.1, 4.2,

4.3, and 4.4;
• each terminal designation shall be clearly distinguishable from the others.

Figure 6 shows an example of a device with a terminal associated with a terminal designation

set.

Figure 7 shows an example of a design with terminal designations related to the function

aspect indicated.

Figure 8 shows an implementation of the same design, now with terminal designations related

to the product aspect indicated.

Figure 9 shows the implementation of the design with terminal designation sets indicated.

---------------------- Page: 13 ----------------------
– 12 – 61666 © IEC:2010
=T1=K2
RAM 16x4
Terminal designation set:
=T1=K2:=1EN terminal designation related to the function aspect
=T1=K2:-3 terminal designation related to the product aspect
1C2[WRITE]
1EN[READ]
4 5
A, 2D
6 7
10 9
12 11
IEC 1961/10
Figure 6 – Example of a terminal designation set
IEC 1962/10

Figure 7 – Example of a design with terminal designations related to the function aspect

---------------------- Page: 14 ----------------------
61666 © IEC:2010 – 13 –
IEC 1962/10
Figure 8 – Example of an implemented design based on Figure 7 with terminal
designations related to the product aspect
IEC 1963/10
Figure 9 – Example of an implemented design based on Figure 7 with terminal
designation sets related to the function and product aspects
5 Classification of terminals

Products may be provided with multiple kinds of terminals designed for connection to different

kinds of networks, e.g. electrical, mechanical etc. These kinds of terminals shall be classified

according to IEC 81714-3. In such cases, where an object is equipped with different kinds of

terminals and presented in a common documentation, the accompanying documentation shall

clearly indicate what kind of terminal is provided. For this purpose the connect node code

given in IEC 81714-3 shall be used.
---------------------- Page: 15 ----------------------
– 14 – 61666 © IEC:2010
Annex A
(informative)
Examples of terminal designations
...