Industrial systems, installations and equipment and industrial products - Structuring principles and reference designations - Part 1: Basic rules (IEC 81346-1:2022)

This part of IEC 81346, published jointly by IEC and ISO, establishes general principles for the structuring of systems including structuring of the information about systems.
Based on these principles, rules and guidance are given for the formulation of unambiguous reference designations for objects in any system.
The reference designation identifies objects for the purpose of creation and retrieval of information about an object, and where realized about its corresponding component.
A reference designation labelled at a component is the key to find information about that object among different kinds of documents.
The principles are general and are 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 document is also a horizontal publication intended for use by technical committees in preparation of publications related to reference designations in accordance with the principles laid down in IEC Guide 108.

Industrielle Systeme, Anlagen und Ausrüstungen und Industrieprodukte - Strukturierungsprinzipien und Referenzkennzeichnung - Teil 1: Allgemeine Regeln (IEC 81346-1:2022)

Systèmes industriels, installations et appareils, et produits industriels - Principes de structuration et désignations de référence - Partie 1: Règles de base (IEC 81346-1:2022)

L'IEC 81346-1:2022 établit les principes généraux pour la structuration des systèmes, y compris la structuration des informations sur ces systèmes. Sur la base de ces principes, des règles et des recommandations sont données pour la formulation de désignations de référence non ambiguës applicables aux objets d’un système, quel qu’il soit. La désignation de référence identifie des objets dans le but de créer et de récupérer des informations sur un objet et, lorsqu’elle est réalisée, au sujet de son composant correspondant. Une désignation de référence rattachée à un composant est la clef qui permet de trouver des informations sur cet objet parmi différentes sortes de documents. Les principes énoncés sont généraux et applicables à tous les domaines techniques (par exemple génie mécanique, électrique, civil ou des procédés). Ils peuvent être utilisés pour des systèmes basés sur des technologies différentes, ou pour des systèmes combinant plusieurs technologies. Le présent document est également une publication horizontale destinée à être utilisée par les comités techniques pour l’établissement de publications liées aux désignations de référence conformément aux principes exposés dans l’IEC Guide 108. L'IEC 81346-1:2022 annule et remplace la première édition, publiée en 2009. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente: a) ajout d’une référence au Guide IEC 108 dans le domaine d’application, en tant que publication horizontale; b) alignement sur l’IEC 81346-2:2019 et l’ISO 81346-12:2018; c) introduction de l’aspect de type; d) introduction d’un modèle d’information du système de désignation de référence; e) introduction d’un modèle d’information dans le cadre du système de désignation de référence conformément à la série de Normes internationales 81346; f) introduction d’une recommandation relative aux métadonnées pour la gestion de la structure de conception; g) introduction de règles et d’une méthode pour la désignation des relations entre les objets; h) introduction d’exigences relatives au développement de parties de la série de Normes internationales 81346 spécifiques à certains secteurs; i) introduction d’exigences concernant l’incorporation de sous-objets dans les structures à objets; j) introduction de recommandations sur la documentation de l’application de la série de Normes internationales 81346; k) ajout de définitions de nouveaux termes utilisés; l) ajout de nouvelles règles et modification des règles existantes; m) conversion des notes relatives aux règles en texte normatif en tant que "Commentaire à la règle nn".

Industrijski sistemi, inštalacije in oprema ter industrijski izdelki - Načela strukturiranja in referenčne oznake - 1. del: Osnovna pravila (IEC 81346-1:2022)

General Information

Status
Published
Public Enquiry End Date
30-Jan-2021
Publication Date
14-Nov-2022
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
19-May-2022
Due Date
24-Jul-2022
Completion Date
15-Nov-2022

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SLOVENSKI STANDARD
SIST EN IEC 81346-1:2022
01-december-2022
Nadomešča:
SIST EN 81346-1:2009
Industrijski sistemi, inštalacije in oprema ter industrijski izdelki - Načela

strukturiranja in referenčne oznake - 1. del: Osnovna pravila (IEC 81346-1:2022)

Industrial systems, installations and equipment and industrial products - Structuring

principles and reference designations - Part 1: Basic rules (IEC 81346-1:2022)
Industrielle Systeme, Anlagen und Ausrüstungen und Industrieprodukte -

Strukturierungsprinzipien und Referenzkennzeichnung - Teil 1: Allgemeine Regeln (IEC

81346-1:2022)

Systèmes industriels, installations et appareils, et produits industriels - Principes de

structuration et désignations de référence - Partie 1: Règles de base (IEC 81346-

1:2022)
Ta slovenski standard je istoveten z: EN IEC 81346-1:2022
ICS:
01.110 Tehnična dokumentacija za Technical product
izdelke documentation
29.020 Elektrotehnika na splošno Electrical engineering in
general
SIST EN IEC 81346-1:2022 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN IEC 81346-1:2022
---------------------- Page: 2 ----------------------
SIST EN IEC 81346-1:2022
EUROPEAN STANDARD EN IEC 81346-1
NORME EUROPÉENNE
EUROPÄISCHE NORM May 2022
ICS 01.110; 29.020 Supersedes EN 81346-1:2009
English Version
Industrial systems, installations and equipment and industrial
products - Structuring principles and reference designations -
Part 1: Basic rules
(IEC 81346-1:2022)

Systèmes industriels, installations et appareils, et produits Industrielle Systeme, Anlagen und Ausrüstungen und

industriels - Principes de structuration et désignations de Industrieprodukte - Strukturierungsprinzipien und

référence - Partie 1: Règles de base Referenzkennzeichnung - Teil 1: Allgemeine Regeln

(IEC 81346-1:2022) (IEC 81346-1:2022)

This European Standard was approved by CENELEC on 2022-05-04. 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the

Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, 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: Rue de la Science 23, B-1040 Brussels

© 2022 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 81346-1:2022 E
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SIST EN IEC 81346-1:2022
EN IEC 81346-1:2022 (E)
European foreword

The text of document 3/1541/FDIS, future edition 2 of IEC 81346-1, prepared by IEC/TC 3

"Documentation, graphical symbols and representations of technical information" was submitted to the

IEC-CENELEC parallel vote and approved by CENELEC as EN IEC 81346-1:2022.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2023-02-04

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2025-05-04

document have to be withdrawn

This document supersedes EN 81346-1:2009 and all of its amendments and corrigenda (if any).

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

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

Any feedback and questions on this document should be directed to the users’ national committee. A

complete listing of these bodies can be found on the CENELEC website.
Endorsement notice

The text of the International Standard IEC 81346-1:2022 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 60297-3-100 NOTE Harmonized as EN 60297-3-100
IEC 60297-3-101:2004 NOTE Harmonized as EN 60297-3-101:2004 (not modified)
IEC 61175-1:2015 NOTE Harmonized as EN 61175-1:2015 (not modified)
IEC 61355-1:2008 NOTE Harmonized as EN 61355-1:2008 (not modified)
IEC 61666:2010 NOTE Harmonized as EN 61666:2010 (not modified)
IEC 61666:2010/A1:2021 NOTE Harmonized as EN 61666:2010/A1:2021 (not modified)
IEC 62023 NOTE Harmonized as EN 62023
IEC 62027 NOTE Harmonized as EN 62027
IEC 62424:2016 NOTE Harmonized as EN 62424:2016 (not modified)
IEC 62491:2008 NOTE Harmonized as EN 62491:2008 (not modified)
IEC 81714-3 NOTE Harmonized as EN 81714-3
IEC 82045-1 NOTE Harmonized as EN 82045-1
IEC 82045-2:2004 NOTE Harmonized as EN 82045-2:2005 (not modified)
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SIST EN IEC 81346-1:2022
EN IEC 81346-1:2022 (E)
IEC/IEEE 82079-1:2019 NOTE Harmonized as EN IEC/IEEE 82079-1:2020 (not modified)
ISO 3166-1 NOTE Harmonized as EN ISO 3166-1
ISO 4157 (series) NOTE Harmonized as EN ISO 4157 (series)
ISO 4157-3 NOTE Harmonized as EN ISO 4157-3
ISO 9000:2015 NOTE Harmonized as EN ISO 9000:2015 (not modified)
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SIST EN IEC 81346-1:2022
EN IEC 81346-1:2022 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

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

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

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

applies.

NOTE 1 Where 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 81346-2 2019 Industrial systems, installations and EN IEC 81346-2 2019
equipment and industrial products -
Structuring principles and reference
designations - Part 2: Classification of
objects and codes for classes
ISO/IEC 646 - Information technology; ISO 7-bit coded - -
character set for information interchange
ISO 81346-10 — Industrial systems, installations and - -
equipment and industrial products -
Structuring principles and reference
designation - Part 10: Power plants
ISO 81346-12 2018 Industrial systems, installations and - -
equipment and industrial products -
Structuring principles and reference
designations - Part 12: Construction works
and building services
In preparation. Stage at time of publication: ISO DIS 81346-10:2021.
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SIST EN IEC 81346-1:2022
IEC 81346-1
Edition 2.0 2022-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
HORIZONTAL PUBLICATION
PUBLICATION HORIZONTALE
Industrial systems, installations and equipment and industrial products –
Structuring principles and reference designations –
Part 1: Basic rules
Systèmes industriels, installations et appareils, et produits industriels –
Principes de structuration et désignations de référence –
Partie 1: Règles de base
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 01.110; 29.020 ISBN 978-2-8322-1077-7

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.

---------------------- Page: 7 ----------------------
SIST EN IEC 81346-1:2022
– 2 – IEC 81346-1:2022 © IEC 2022
CONTENTS

FOREWORD ........................................................................................................................... 8

INTRODUCTION ................................................................................................................... 11

1 Scope ............................................................................................................................ 13

2 Normative references .................................................................................................... 13

3 Terms and definitions .................................................................................................... 14

4 Concepts ....................................................................................................................... 16

4.1 Object ................................................................................................................... 16

4.2 Aspect .................................................................................................................. 17

4.3 Systems ................................................................................................................ 19

4.4 Structuring ............................................................................................................ 19

4.5 Function ................................................................................................................ 19

4.6 Products and components ..................................................................................... 20

4.7 Location ................................................................................................................ 21

4.8 Types.................................................................................................................... 21

4.9 Object occurrences and product individuals .......................................................... 21

4.10 Relations between concepts ................................................................................. 22

5 Structuring principles ..................................................................................................... 23

5.1 General ................................................................................................................. 23

5.2 Forming structures ................................................................................................ 26

5.3 Function-oriented structure ................................................................................... 28

5.4 Product-oriented structure..................................................................................... 29

5.5 Location-oriented structure ................................................................................... 30

5.6 Type-oriented structure ......................................................................................... 31

5.7 Structures based on "other aspects" ..................................................................... 31

5.8 Structures based on more than one aspect ........................................................... 33

6 Construction of reference designations .......................................................................... 34

6.1 General ................................................................................................................. 34

6.2 Format of reference designations .......................................................................... 35

6.2.1 Single level .................................................................................................... 35

6.2.2 Multi-level ...................................................................................................... 36

6.2.3 Use of letter codes ........................................................................................ 36

6.3 Different structures within the same aspect ........................................................... 37

7 Reference designation set ............................................................................................. 37

8 Designation of locations ................................................................................................ 39

8.1 General ................................................................................................................. 39

8.2 Assemblies ........................................................................................................... 39

9 Presentation of reference designations .......................................................................... 41

9.1 Reference designations ........................................................................................ 41

9.2 Reference designation set .................................................................................... 42

9.3 Presentation of identifiers for the top-node ............................................................ 43

10 Labelling ........................................................................................................................ 44

11 Presentation of properties for an object ......................................................................... 45

12 Application of the reference designation system ............................................................ 46

Annex A (informative) Information model on the reference designation system .................... 47

A.1 General ................................................................................................................. 47

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SIST EN IEC 81346-1:2022
IEC 81346-1:2022 © IEC 2022 – 3 –

A.2 EXPRESS-G model ............................................................................................... 47

A.3 Entity descriptions ................................................................................................ 48

A.3.1 object ............................................................................................................ 48

A.3.2 aspect ........................................................................................................... 48

A.3.3 object_occurrence ......................................................................................... 48

A.3.4 function_occurrence ...................................................................................... 48

A.3.5 product_occurrence ....................................................................................... 49

A.3.6 location_occurrence....................................................................................... 49

A.3.7 type_occurrence ............................................................................................ 49

A.3.8 other_aspect_occurrence............................................................................... 49

A.3.9 reference_designation ................................................................................... 49

A.3.10 single_level_reference_designation ............................................................... 49

A.3.11 multi_level_reference_designation ................................................................. 50

A.3.12 reference_designation_set ............................................................................. 50

A.3.13 classification_scheme .................................................................................... 50

A.3.14 class .............................................................................................................. 50

A.3.15 top_node_identifier ........................................................................................ 51

A.3.16 product_individual ......................................................................................... 51

A.4 Enumerations ........................................................................................................ 51

A.4.1 aspect_kind ................................................................................................... 51

A.4.2 81346_classification_domain ......................................................................... 51

A.5 EXPRESS code .................................................................................................... 52

Annex B (informative) Establishment and life cycle of objects .............................................. 54

B.1 Establishment and validity of objects .................................................................... 54

B.2 Life cycle story of an object................................................................................... 55

B.2.1 Overview ....................................................................................................... 55

B.2.2 Function aspect and function based on a function-oriented structure (A)........ 55

B.2.3 Functional requirement specification FR1 (B) ................................................. 57

B.2.4 Location aspect and reference designation based on a location-oriented

structure (C) .................................................................................................. 57

B.2.5 Component type specification CT1 (D) ........................................................... 57

B.2.6 Function list for system design FL1 and location list for physical design

LL1 (E) .......................................................................................................... 58

B.2.7 Product specification PS1 (F) ........................................................................ 58

B.2.8 Parts list for manufacturing/installation PL1 (G) ............................................. 58

B.2.9 Transport specification (H) ............................................................................. 59

B.2.10 Installation (J) ................................................................................................ 59

B.2.11 Commissioning (K) ........................................................................................ 59

B.2.12 Acceptance and individual log IL1 (L) ............................................................ 59

B.2.13 Operation and maintenance (M) ..................................................................... 59

B.2.14 Alternative motor product individual (N) ......................................................... 60

B.2.15 Alternative motor type and supplier CT2, PS2 (P) .......................................... 60

B.2.16 Process modification (R) ................................................................................ 60

B.2.17 Location extension (S) ................................................................................... 60

B.2.18 Etc. (T) .......................................................................................................... 60

B.2.19 Closing down (U) ........................................................................................... 60

B.2.20 Dismantling (V) .............................................................................................. 60

B.2.21 Life cycle end (X) ........................................................................................... 61

B.3 Discussion on the concept "object" ................................................................................ 61

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SIST EN IEC 81346-1:2022
– 4 – IEC 81346-1:2022 © IEC 2022

B.3.1 Different meanings of "motor" ........................................................................ 61

B.3.2 Definition of "object" ...................................................................................... 61

B.4 Discussion on different life cycles .................................................................................. 62

Annex C (informative) Manipulation of objects ..................................................................... 63

C.1 General ................................................................................................................. 63

C.2 Establishment and validity of objects .................................................................... 63

C.2.1 Structuring ..................................................................................................... 63

C.2.2 Ending the structuring .................................................................................... 64

C.2.3 Relations between closely related objects ...................................................... 64

C.2.4 The roles of the reference designations set ................................................... 66

C.2.5 Example ........................................................................................................ 66

C.3 Life cycle situations .............................................................................................. 71

C.3.1 One object for all aspects .............................................................................. 71

C.3.2 One object for each aspect ............................................................................ 72

Annex D (informative) Interpretation of reference designations using different aspects ........ 74

Annex E (normative) Object represented with several top nodes in an aspect ...................... 77

E.1 General ................................................................................................................. 77

E.2 Example using aspect shift in structures ............................................................... 77

E.3 Example using aspect-oriented structures ............................................................. 78

Annex F (informative) Examples of multiple structures based on the same aspect ............... 80

F.1 Different function-oriented structures for a process plant ...................................... 80

F.2 Topographical location of a system versus locations within an assembly............... 81

F.3 Different structuring for different needs ................................................................. 82

Annex G (normative) Incorporating sub-objects in object structures ..................................... 84

G.1 General ................................................................................................................. 84

G.2 Example................................................................................................................ 84

Annex H (informative) Example of reference designations within a system ........................... 88

Annex I (normative) Designation of relations between objects .............................................. 94

I.1 General ................................................................................................................. 94

I.2 Basic principles ..................................................................................................... 94

I.3 Designation of associative relations ...................................................................... 94

I.4 Classification of relation kinds ............................................................................... 95

I.5 Example of designation of associative relations .................................................... 95

Annex J (normative) Requirements for developing sector-specific parts of the

International Standard 81346 series .............................................................................. 97

J.1 General ................................................................................................................. 97

J.2 81346 framework information model...................................................................... 97

J.2.1 EXPRESS-G model ....................................................................................... 97

J.2.2 Entity descriptions ......................................................................................... 98

J.2.3 Enumerations – 81346_classification_domain .............................................. 100

J.2.4 EXPRESS code ........................................................................................... 102

Annex K (informative) Metadata resource for structure management .................................. 103

Annex L (informative) Recommendations for documentation of the application of the

reference designation system ............................................................................................. 105

Annex M (informative) Fundamental ideas for this document.............................................. 111

M.1 General ............................................................................................................... 111

M.2 Basic requirements for a reference designation system ....................................... 111

M.3 Required properties for a reference designation system ...................................... 111

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SIST EN IEC 81346-1:2022
IEC 81346-1:2022 © IEC 2022 – 5 –

Annex N (informative) Relationship to other standards ....................................................... 112

N.1 General ............................................................................................................... 112

N.2 Use together with ISO/IEC/IEEE 42010:2011 ...................................................... 112

N.2.1 General ....................................................................................................... 112

N.2.2 Architecture description and architecture description language .................... 112

N.3 Use together with IEC 61355-1:2008 ................................................................... 113

N.3.1 General ....................................................................................................... 113

N.3.2 Document designation ................................................................................. 113

N.4 Use together with IEC 61175-1:2015 ................................................................... 114

N.4.1 General ....................................................................................................... 114

N.4.2 Signal designation ....................................................................................... 114

N.5 Use together with IEC 61666:2010 ...................................................................... 115

N.5.1 General ....................................................................................................... 115

N.5.2 Terminal designation ................................................................................... 115

Bibliography ........................................................................................................................ 116

Figure 1 – International Standards providing a consistent system for designation,

documentation and presentation of information ..................................................................... 12

Figure 2 – Illustration of an object ......................................................................................... 17

Figure 3 – Aspects of an object ............................................................................................. 18

Figure 4 – Generic relation between the functionality of a technical system and a

technical process .................................................................................................................. 19

Figure 5 – Example of functionality of a technical system and a technical process ................ 20

Figure 6 – Illustration of the concept’s product, component, type, individual and

occurrence ............................................................................................................................ 22

Figure 7 – Illustration of structural decomposition of an object from different aspects ........... 24

Figure 8 – Illustration of a function-oriented decomposition and product-oriented

composition .......................................................................................................................... 25

Figure 9 – Structure tree of object A (alternative 1) ............................................................... 26

Figure 10 – Structure tree of object A (alternative 2) ............................................................. 26

Figure 11 – Constituents in one aspect of object type 1 ........................................................ 27

Figure 12 – Constituents in one aspect of object type 2 ........................................................ 27

Figure 13 – Constituents in one aspect of object type 5 ........................................................ 27

Figure 14 – Structure tree of object type 1 ............................................................................ 28

Figure 15 – Illustration of a function-oriented structure ......................................................... 29

Figure 16 – Illustration of a product-oriented struct
...

SLOVENSKI STANDARD
oSIST prEN IEC 81346-1:2021
01-januar-2021
Industrijski sistemi, inštalacije in oprema ter industrijski izdelki - Načela
strukturiranja in referenčne oznake - 1. del: Osnovna pravila

Industrial systems, installations and equipment and industrial products - Structuring

principles and reference designations - Part 1: Basic rules
Industrielle Systeme, Anlagen und Ausrüstungen und Industrieprodukte -
Strukturierungsprinzipien und Referenzkennzeichnung - Teil 1: Allgemeine Regeln

Systèmes industriels, installations et appareils, et produits industriels - Principes de

structuration et désignations de référence - Partie 1: Règles de base
Ta slovenski standard je istoveten z: prEN IEC 81346-1:2020
ICS:
01.110 Tehnična dokumentacija za Technical product
izdelke documentation
29.020 Elektrotehnika na splošno Electrical engineering in
general
oSIST prEN IEC 81346-1:2021 en,fr,de

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

---------------------- Page: 1 ----------------------
oSIST prEN IEC 81346-1:2021
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oSIST prEN IEC 81346-1:2021
3/1463/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 81346-1 ED2
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2020-11-27 2021-02-19
SUPERSEDES DOCUMENTS:
3/1439/CD, 3/1448B/CC

IEC TC 3 : DOCUMENTATION, GRAPHICAL SYMBOLS AND REPRESENTATIONS OF TECHNICAL INFORMATION

SECRETARIAT: SECRETARY:
Sweden Mr Thomas Borglin
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
Other TC/SCs are requested to indicate their interest, if any,
in this CDV to the secretary.
FUNCTIONS CONCERNED:
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SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING

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The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft for
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The CENELEC members are invited to vote through the
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This document is still under study and subject to change. It should not be used for reference purposes.

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TITLE:

Industrial systems, installations and equipment and industrial products - Structuring principles and

reference designations - Part 1: Basic rules
PROPOSED STABILITY DATE: 2026
NOTE FROM TC/SC OFFICERS:

Copyright © 2020 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to download this

electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.

You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without

permission in writing from IEC.
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oSIST prEN IEC 81346-1:2021
IEC CDV 81346-1  IEC:2020 – 2 – 3/1463/CDV
CONTENTS

1 FOREWORD ........................................................................................................................... 6

2 INTRODUCTION ..................................................................................................................... 8

3 0.1 General ................................................................................................................... 8

4 0.2 Basic requirements for this standard ....................................................................... 8

5 0.3 Required properties of the standard ........................................................................ 9

6 0.4 Framework of the IEC/ISO 81346 series ................................................................ 10

7 1 Scope ............................................................................................................................. 11

8 2 Normative references ..................................................................................................... 11

9 3 Terms and definitions ..................................................................................................... 12

10 4 Concepts ........................................................................................................................ 14

11 Object ................................................................................................................... 14

12 Aspect ................................................................................................................... 15

13 Systems ................................................................................................................ 16

14 Structuring ............................................................................................................ 16

15 Function ................................................................................................................ 17

16 Products and components ..................................................................................... 18

17 Location ................................................................................................................ 18

18 Types .................................................................................................................... 18

19 Object occurrences and product individuals ........................................................... 19

20 Relations between concepts .................................................................................. 19

21 5 Structuring principles ...................................................................................................... 21

22 General ................................................................................................................. 21

23 Forming structures ................................................................................................ 22

24 Function-oriented structure .................................................................................... 25

25 Product-oriented structure ..................................................................................... 26

26 Location-oriented structure .................................................................................... 27

27 Type-oriented structure ......................................................................................... 28

28 Structures based on “other aspects” ...................................................................... 28

29 Structures based on more than one aspect ............................................................ 30

30 6 Construction of reference designations ........................................................................... 31

31 General ................................................................................................................. 31

32 Format of reference designations .......................................................................... 31

33 Single level ................................................................................................ 31

34 Multi-level .................................................................................................. 32

35 Use of letter codes .................................................................................... 33

36 Different structures within the same aspect ........................................................... 33

37 7 Reference designation set .............................................................................................. 33

38 8 Designation of locations ................................................................................................. 35

39 General ................................................................................................................. 35

40 Assemblies ............................................................................................................ 35

41 9 Presentation of reference designations ........................................................................... 37

42 Reference designations ......................................................................................... 37

43 Reference designations set ................................................................................... 38

44 Presentation of identifiers for the top-node ............................................................ 39

45 10 Labelling ........................................................................................................................ 40

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46 11 Application of the reference designation system ............................................................. 41

47 Annex A (informative) Information model on the reference designation system .................... 42

48 Annex B (informative) Establishment and life cycle of objects .............................................. 49

49 Annex C (informative) Manipulation of objects ..................................................................... 59

50 Annex D (informative) Interpretation of reference designations using different aspects ........ 70

51 Annex E (normative) Object represented with several top nodes in an aspect ...................... 73

52 Annex F (informative) Examples of multiple structures based on the same aspect ............... 76

53 Annex G (normative) Incorporating sub-objects in object structures ..................................... 80

54 Annex H (informative) Example of reference designations within a system ........................... 83

55 Annex I (normative) Designation of relations between objects .............................................. 90

56 Annex J (normative) Requirements for developing sector specific parts of the

57 IEC/ISO 81346 series ..................................................................................................... 93

58 Annex K (informative) Metadata resource for structure management .................................... 98

59 Annex L (informative) Recommendations for documentation of the application of the

60 reference designation system ....................................................................................... 101

Annex M (informative) Relationship to other standards ...................................................... 106

62 Bibliography ........................................................................................................................ 110

64 Figure 1 – International standards providing a consistent system for designation,

65 documentation and presentation of information ..................................................................... 10

66 Figure 2 – Illustration of an object ......................................................................................... 15

67 Figure 3 – Aspects of an object ............................................................................................. 16

68 Figure 4 – Generic relation between the functionality of a technical system and a

69 technical process .................................................................................................................. 17

70 Figure 5 – Example of functionality of a technical system and a technical process ................ 17

71 Figure 6 – Illustration of the concept’s product, component, type, individual and

72 occurrence ............................................................................................................................ 20

Figure 7 – Illustration of structural decomposition of an object from different aspects ........... 21

74 Figure 8 – Illustration of a function-oriented decomposition and product-oriented

75 composition .......................................................................................................................... 22

76 Figure 9 – Structure tree of object A (alternative 1) ............................................................... 23

77 Figure 10 – Structure tree of object A (alternative 2) ............................................................. 23

78 Figure 11 – Constituents in one aspect of object type 1 ........................................................ 24

79 Figure 12 – Constituents in one aspect of object type 2 ........................................................ 24

80 Figure 13 – Constituents in one aspect of object type 5 ........................................................ 24

81 Figure 14 – Structure tree of object type 1 ............................................................................ 25

82 Figure 15 – Illustration of a function-oriented structure ......................................................... 26

83 Figure 16 – Illustration of a product-oriented structure .......................................................... 27

84 Figure 17 – Illustration of a location-oriented structure .......................................................... 28

85 Figure 18 – Example of the use of “other aspect” .................................................................. 29

86 Figure 19 – Example of the use of “other aspect” .................................................................. 29

87 Figure 20 – Illustration of an object accessible from three aspects, and where these

88 aspects are used also for internal structuring ........................................................................ 30

89 Figure 21 – Illustration of an object identified by means of one aspect and with sub-

90 objects identified by means of another aspect ....................................................................... 30

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91 Figure 22 – Examples of single-level reference designations ................................................ 32

92 Figure 23 – Relation between a multi-level reference designation and its single-level

93 reference designations.......................................................................................................... 32

94 Figure 24 – Examples of multi-level reference designations with multiple prefix signs ........... 33

95 Figure 25 – Example of reference designation sets ............................................................... 35

96 Figure 26 – Example of designation of mounting planes inside a factory build assembly ....... 36

97 Figure 27 – Examples of designation of locations inside a factory build assembly ................. 37

98 Figure 28 – Examples of presentations of multi-level reference designations ........................ 38

99 Figure 29 – Presentation of reference designations of a reference designation set ............... 39

100 Figure 30 – Different objects on a site identified with top node identifiers.............................. 39

101 Figure 31 – The common initial portion of reference designations ......................................... 40

102 Figure 32 – Labelling of reference designations .................................................................... 40

103 Figure A.1 – EXPRESS-G model of the reference designation system .................................. 42

104 Figure B.1 – Development situations of objects ..................................................................... 49

105 Figure B.2 – The object’s life cycle ....................................................................................... 51

106 Figure C.1 – Three independently defined objects ................................................................ 60

107 Figure C.2 – Three separate objects with mutual relations .................................................... 61

108 Figure C.3 – The three objects are merged into one.............................................................. 61

109 Figure C.4 – Overview of the process system ....................................................................... 62

110 Figure C.5 – Tree-like structures of the system ..................................................................... 63

111 Figure C.7 – Structures with designated sub-objects ............................................................. 64

112 Figure C.8 – Structures with some merged-and shared objects ............................................. 65

113 Figure C.9 – Relations expressed by reference designation sets in which both
114

designations are unambiguous.............................................................................................. 66

115 Figure C.10 – Relations expressed by reference designation sets in which one

116 designation is ambiguous ...................................................................................................... 66

117 Figure C.11 – Situations in the beginning of an object’s life cycle accessible from three

118 aspects ................................................................................................................................. 67

119 Figure C.12 – Situations in the beginning of the life cycle of closely related objects,

120

each accessible from one aspect .......................................................................................... 68

121 Figure D.1 – Shift from function to product aspect................................................................. 70

122

Figure D.2 – Shift from product to function aspect ................................................................. 70

123 Figure D.3 – Shift from product to location aspect ................................................................. 71

124

Figure D.4 – Shift from location to product aspect ................................................................. 71

125 Figure D.5 – Shift from function to location aspect ................................................................ 72

126

Figure D.6 – Shift from location to function aspect ................................................................ 72

127 Figure E.1 – Object represented with several independent top nodes in one aspect .............. 73

128 Figure E.2 – Example of multi-level reference designations using different aspects of

129 an object with several independent top nodes in one aspect ................................................. 74

130 Figure E.3 – Object represented with several independent top nodes in one aspect

131 using aspect-oriented structures ........................................................................................... 75

132 Figure F.1 – Illustration of the concept of additional functional views of an industrial

133 process plant ........................................................................................................................ 76

134

Figure F.2 – Location-oriented structure of a plant ................................................................ 77

135 Figure F.3 – Location-oriented structure within an assembly unit .......................................... 77

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136 Figure F.4 – Location-oriented structures of the plant ........................................................... 78

137 Figure F.5 – Example of additional product-oriented structures ............................................. 79

138 Figure G.1 – Sub-contractor’s design .................................................................................... 80

139 Figure G.2 – Receiving organization’s design ....................................................................... 81

140 Figure G.3 – Full structure of the receiving organization’s design ......................................... 81

141 Figure H.1 – Process flow diagram for a material handling plant ........................................... 83

142 Figure H.2 – Overview diagram of part of the process system (=V1) and part of the

143 power supply system (=Q1) .................................................................................................. 84

144 Figure H.3 – Structure tree for parts of the material handling plant ....................................... 85

145 Figure H.4 – Layout drawing of the components of the MCC =Q1=W1 .................................. 86

146 Figure H.5 – Layout drawing indicating the location of the MCC ............................................ 86

147 Figure H.6 – Layout drawing of the locations of the MCC =Q1=W1 ....................................... 87

148 Figure H.7 – Motor starter ..................................................................................................... 87

149 Figure H.8 – Product- and location-oriented structure trees for the MCC ............................... 88

150 Figure I.1 - Structure of a relation designation ...................................................................... 91

151 Figure J.1 - 81346 framework – an EXPRESS-G model ........................................................ 94

152 Figure I.1 – Principle of document designation .................................................................... 107

153 Figure I.2 – Signal designation and signal connection identification .................................... 108

154 Figure I.3 - Principle of terminal designation ....................................................................... 109

155 Table 1 – Identification of types, occurrences and individuals within different contexts ......... 20

156 Figure C.6 – Completed structures of the system .................................................................. 64

157 Table C.1 – Possible reference designation sets ................................................................... 65

158 Table G.1 – Reference designations in the receiver’s design ................................................ 82

159 Table H.1 – Reference designation set for the constituents of the products MCC and

160

motor starter ......................................................................................................................... 89

161 Table I.1 – Example of classification scheme for associative relations .................................. 92

162

Table I.2 – Examples of relation designations ....................................................................... 92

163 Table K.1 – Additional mandatory metadata elements ........................................................... 99

164

Table L.1 – Documentation on the application of the rules .................................................. 101

165
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166 INTERNATIONAL ELECTROTECHNICAL COMMISSION
167 ____________
168
169 INDUSTRIAL SYSTEMS, INSTALLATIONS
170 AND EQUIPMENT AND INDUSTRIAL PRODUCTS –
171 STRUCTURING PRINCIPLES AND REFERENCE DESIGNATIONS –
172
173 Part 1: Basic rules
174
175 FOREWORD

176 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

177 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international

178 co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and

179 in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,

180 Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their

181 preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with

182 may participate in this preparatory work. International, governmental and non-governmental organizations liaising

183 with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for

184 Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.

185 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

186 consensus of opinion on the relevant subjects since each technical committee has representation from all

187 interested IEC National Committees.

188 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

189 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

190 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

191 misinterpretation by any end user.

192 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

193 transparently to the maximum extent possible in their national and regional publications. Any divergence between

194 any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.

195 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment

196 declared to be in conformity with an IEC Publication.

197 6) All users should ensure that they have the latest edition of this publication.

198 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

199 members of its technical committees and IEC National Committees for any personal injury, property damage or

200 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

201 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

202 Publications.

203 8) Attention is drawn to the normative references cited in this publication. Use of the referenced publications is

204 indispensable for the correct application of this publication.

205 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent

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

207 IEC 81346-1 has been prepared by IEC technical committee 3: Documentation, graphical

208 symbols, and representations of technical information in close co-operation with ISO technical

209 committee 10: Technical product documentation.

210 It is published as a double logo standard and has the status of a horizontal publication in

211 accordance with IEC Guide 108.

212 This second edition cancels and replaces the first edition of IEC 81346-1, published in 2009.

213 This edition constitutes a technical revision.

214 This edition includes the following substantial changes with respect to the first edition of

215 IEC 81346-1:

216 – the scope includes a reference to Guide 108 for being a horizontal publication

217 – synchronization with IEC 81346-2:2019 and ISO 81346-12:2018
218 – the introduction of the type aspect
219 – introduction of an information model of the reference designation system
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220 – introduction of an information model for the framework of reference designation system to

221 comply with IEC/ISO 81346 series

222 – introduction of recommendation for metadata for design structure management

223 – introduction of rules and method for designation of relations between objects

224 – Introduction of requirements for development of sector specific parts of the IEC/ISO 81346

225 series

226 – introduction of requirements for incorporation of sub-object in object structures

227 – introduction of recommendations for documentation of the application of the IEC/ISO 81346

228 series
229 – introduced definition of new terms used
230 – new rules added and existing rules modified
231 The text of this standard is based on the following documents:
FDIS Report on voting
3/xxx/FDIS 3/xxx/RVD
232

233 Full information on the voting for the approval of this standard can be found in the report on

234 voting indicated in the above table. In ISO, the standard has been approved by xx members out

235 of xx having cast a vote.

236 This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

237 A list of all parts of the International Standard 81346 series, under the general title Industrial

238 systems, installations and equipment and industrial products – structuring principles and

239 reference designations, can be found on the IEC website.

240 The committee has decided that the contents of this publication will remain unchanged until the

241 maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in the data

242 related to the specific publication. At this date, the publication will be
243 • reconfirmed,
244 • withdrawn,
245 • replaced by a revised edition, or
246 • amended.
247

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 publication using a colour printer.

248
249
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250 INTRODUCTION
251 0.1 General

252 This standard establishes a further development of earlier and withdrawn standards on item

253 designation. It provides basics for establishing models o
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