IEC 62541-3:2020
(Main)OPC Unified Architecture - Part 3: Address Space Model
OPC Unified Architecture - Part 3: Address Space Model
IEC 62541-3:2020 defines the OPC Unified Architecture (OPC UA) AddressSpace and its Objects. This document is the OPC UA meta model on which OPC UA information models are based. This third edition cancels and replaces the second edition published in 2015. This edition includes the following significant technical changes with respect to the previous edition:
a) Added new improved approach for exposing structure definitions. An Attribute on the DataType Node now simply contains a binary description.
b) Added new flags for Variables to indicate atomicity when reading or writing.
c) Added Roles and Permissions to allow configuration of a role-based authorization.
d) Added new data types: “Union”, “Decimal”, “OptionSet”, “DateString”, “TimeString”, “DurationString”, NormalizedString”, “DecimalString”, and “AudioDataType”.
e) Added definition on how to use the ModellingRules OptionalPlaceHolder and MandatoryPlaceHolder for Methods.
f) Added optional Properties “MaxCharacters” and “MaxByteStringLength” to Variable Nodes.
Architecture unifiée OPC - Partie 3: Modèle d'espace d'adressage
L'IEC 62541-3:2020 définit l'AddressSpace de l'Architecture Unifiée OPC (OPC UA) et ses Objets. Le présent document correspond au métamodèle OPC UA sur lequel se fondent les modèles d'information OPC UA. Cette troisième édition annule et remplace la deuxième édition parue en 2015. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) ajout d'une nouvelle approche améliorée afin de présenter les définitions de la structure (un Attribut sur le Nœud du DataType contient désormais simplement une description binaire);
b) ajout de nouveaux fanions pour les Variables afin d'indiquer l'atomicité à la lecture ou à l'écriture;
c) ajout de Rôles et d'Autorisations afin de permettre la configuration d'une autorisation fondée sur les rôles;
d) ajout de nouveaux types de données: "Union", "Decimal", "OptionSet", "DateString", "TimeString", "DurationString", "NormalizedString", "DecimalString" et "AudioDataType";
e) ajout d'une définition expliquant comment utiliser les OptionalPlaceHolder et MandatoryPlaceHolder de ModellingRules pour les Méthodes;
f) ajout de Propriétés facultatives "MaxCharacters" et "MaxByteStringLength" aux Nœuds de variable.
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IEC 62541-3 ®
Edition 3.0 2020-07
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OPC unified architecture –
Part 3: Address Space Model
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International Standards for all electrical, electronic and related technologies.
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IEC 62541-3 ®
Edition 3.0 2020-07
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
OPC unified architecture –
Part 3: Address Space Model
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 25.040.40; 35.100.05 ISBN 978-2-8322-8645-6
– 2 – IEC 62541-3:2020 RLV © IEC 2020
CONTENTS
FOREWORD . 11
1 Scope . 14
2 Normative references . 14
3 Terms, definitions, abbreviated terms and conventions . 15
3.1 Terms and definitions . 15
3.2 Abbreviated terms . 16
3.3 Conventions . 16
3.3.1 Conventions for AddressSpace figures . 16
3.3.2 Conventions for defining NodeClasses. 17
4 AddressSpace concepts . 18
4.1 Overview. 18
4.2 Object Model . 18
4.3 Node Model . 19
4.3.1 General . 19
4.3.2 NodeClasses . 19
4.3.3 Attributes . 20
4.3.4 References . 20
4.4 Variables . 21
4.4.1 General . 21
4.4.2 Properties . 21
4.4.3 DataVariables . 21
4.5 TypeDefinitionNodes . 21
4.5.1 General . 21
4.5.2 Complex TypeDefinitionNodes and their InstanceDeclarations . 22
4.5.3 Subtyping . 23
4.5.4 Instantiation of complex TypeDefinitionNodes . 23
4.6 Event Model . 24
4.6.1 General . 24
4.6.2 EventTypes . 25
4.6.3 Event Categorization . 25
4.7 Methods . 26
4.8 Roles . 26
4.8.1 Overview . 26
4.8.2 Well-known Roles . 27
4.8.3 Evaluating Permissions with Roles . 27
5 Standard NodeClasses . 29
5.1 Overview. 29
5.2 Base NodeClass . 30
5.2.1 General . 30
5.2.2 NodeId. 30
5.2.3 NodeClass . 30
5.2.4 BrowseName . 30
5.2.5 DisplayName . 31
5.2.6 Description . 31
5.2.7 WriteMask . 31
5.2.8 UserWriteMask . 32
5.2.9 RolePermissions . 32
5.2.10 UserRolePermissions . 33
5.2.11 AccessRestrictions . 34
5.3 ReferenceType NodeClass . 34
5.3.1 General . 34
5.3.2 Attributes . 35
5.3.3 References . 37
5.4 View NodeClass . 37
5.5 Objects . 40
5.5.1 Object NodeClass . 40
5.5.2 ObjectType NodeClass . 42
5.5.3 Standard ObjectType FolderType . 44
5.5.4 Client-side creation of Objects of an ObjectType . 44
5.6 Variables . 44
5.6.1 General . 44
5.6.2 Variable NodeClass . 45
5.6.3 Properties . 51
5.6.4 DataVariable . 51
5.6.5 VariableType NodeClass . 52
5.6.6 Client-side creation of Variables of an VariableType . 55
5.7 Method NodeClass . 55
5.8 DataTypes . 57
5.8.1 DataType Model . 57
5.8.2 Encoding rules for different kinds of DataTypes . 59
5.8.3 DataType NodeClass . 60
5.8.4 DataTypeDictionary, DataTypeDescription, DataTypeEncoding and
DataTypeSystem encoding information . 63
5.9 Summary of Attributes of the NodeClasses . 66
6 Type Model for ObjectTypes and VariableTypes . 67
6.1 Overview. 67
6.2 Definitions. 67
6.2.1 InstanceDeclaration . 67
6.2.2 Instances without ModellingRules . 68
6.2.3 InstanceDeclarationHierarchy . 68
6.2.4 Similar Node of InstanceDeclaration . 68
6.2.5 BrowsePath . 68
6.2.6 Attribute Handling of InstanceDeclarations . 68
6.2.7 Attribute Handling of Variable and VariableTypes . 68
6.2.8 NodeIds of InstanceDeclarations . 69
6.3 Subtyping of ObjectTypes and VariableTypes . 69
6.3.1 Overview . 69
6.3.2 Attributes . 69
6.3.3 InstanceDeclarations . 69
6.4 Instances of ObjectTypes and VariableTypes . 73
6.4.1 Overview . 73
6.4.2 Creating an Instance . 73
6.4.3 Constraints on an Instance . 74
6.4.4 ModellingRules . 75
6.5 Changing type definitions that are already used . 82
– 4 – IEC 62541-3:2020 RLV © IEC 2020
7 Standard ReferenceTypes . 83
7.1 General .
...
IEC 62541-3 ®
Edition 3.0 2020-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
OPC unified architecture –
Part 3: Address Space Model
Architecture unifiée OPC –
Partie 3: Modèle d'espace d'adressage
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
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copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
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Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
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IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and
once a month by email. French extracted from the Terms and Definitions clause of
IEC publications issued since 2002. Some entries have been
IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and
If you wish to give us your feedback on this publication or CISPR.
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IEC 62541-3 ®
Edition 3.0 2020-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
OPC unified architecture –
Part 3: Address Space Model
Architecture unifiée OPC –
Partie 3: Modèle d'espace d'adressage
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.040.40; 35.100.05 ISBN 978-2-8322-8580-0
– 2 – IEC 62541-3:2020 © IEC 2020
CONTENTS
FOREWORD . 10
1 Scope . 12
2 Normative references . 12
3 Terms, definitions, abbreviated terms and conventions . 13
3.1 Terms and definitions . 13
3.2 Abbreviated terms . 14
3.3 Conventions . 14
3.3.1 Conventions for AddressSpace figures . 14
3.3.2 Conventions for defining NodeClasses. 15
4 AddressSpace concepts . 16
4.1 Overview. 16
4.2 Object Model . 16
4.3 Node Model . 16
4.3.1 General . 16
4.3.2 NodeClasses . 17
4.3.3 Attributes . 17
4.3.4 References . 17
4.4 Variables . 18
4.4.1 General . 18
4.4.2 Properties . 18
4.4.3 DataVariables . 18
4.5 TypeDefinitionNodes . 19
4.5.1 General . 19
4.5.2 Complex TypeDefinitionNodes and their InstanceDeclarations . 20
4.5.3 Subtyping . 21
4.5.4 Instantiation of complex TypeDefinitionNodes . 21
4.6 Event Model . 22
4.6.1 General . 22
4.6.2 EventTypes . 22
4.6.3 Event Categorization . 23
4.7 Methods . 23
4.8 Roles . 24
4.8.1 Overview . 24
4.8.2 Well-known Roles . 24
4.8.3 Evaluating Permissions with Roles . 25
5 Standard NodeClasses . 27
5.1 Overview. 27
5.2 Base NodeClass . 28
5.2.1 General . 28
5.2.2 NodeId. 28
5.2.3 NodeClass . 28
5.2.4 BrowseName . 28
5.2.5 DisplayName . 29
5.2.6 Description . 29
5.2.7 WriteMask . 29
5.2.8 UserWriteMask . 29
5.2.9 RolePermissions . 30
5.2.10 UserRolePermissions . 31
5.2.11 AccessRestrictions . 31
5.3 ReferenceType NodeClass . 31
5.3.1 General . 31
5.3.2 Attributes . 32
5.3.3 References . 34
5.4 View NodeClass . 34
5.5 Objects . 36
5.5.1 Object NodeClass . 36
5.5.2 ObjectType NodeClass . 38
5.5.3 Standard ObjectType FolderType . 40
5.5.4 Client-side creation of Objects of an ObjectType . 40
5.6 Variables . 40
5.6.1 General . 40
5.6.2 Variable NodeClass . 41
5.6.3 Properties . 45
5.6.4 DataVariable . 45
5.6.5 VariableType NodeClass . 46
5.6.6 Client-side creation of Variables of an VariableType . 49
5.7 Method NodeClass . 49
5.8 DataTypes . 51
5.8.1 DataType Model . 51
5.8.2 Encoding rules for different kinds of DataTypes . 52
5.8.3 DataType NodeClass . 53
5.8.4 DataTypeEncoding and encoding information . 56
5.9 Summary of Attributes of the NodeClasses . 56
6 Type Model for ObjectTypes
...
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