SIST EN IEC 62541-3:2020

SLOVENSKI STANDARD
01-december-2020
Nadomešča:
SIST EN 62541-3:2015
Enotna arhitektura OPC - 3. del: Model naslovnega prostora (IEC 62541-3:2020)
OPC unified architecture - Part 3: Address Space Model (IEC 62541-3:2020)
OPC Unified Architecture - Teil 3: Adressraummodell (IEC 62541-3:2020)
Architecture unifiée OPC - Partie 3: Modèle d'espace d'adressage (IEC 62541-3:2020)
Ta slovenski standard je istoveten z: EN IEC 62541-3:2020
ICS:
25.040.40 Merjenje in krmiljenje Industrial process
industrijskih postopkov measurement and control
35.240.50 Uporabniške rešitve IT v IT applications in industry
industriji
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 62541-3

NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2020
ICS 35.100.05; 25.040.40 Supersedes EN 62541-3:2015 and all of its amendments
and corrigenda (if any)
English Version
OPC Unified Architecture - Part 3: Address Space Model
(IEC 62541-3:2020)
Architecture unifiée OPC - Partie 3: Modèle d'espace OPC Unified Architecture - Teil 3: Adressraummodell
d'adressage (IEC 62541-3:2020)
(IEC 62541-3:2020)
This European Standard was approved by CENELEC on 2020-08-12. 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
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62541-3:2020 E

European foreword
The text of document 65E/715/FDIS, future edition 3 of IEC 62541-3, prepared by SC 65E "Devices
and integration in enterprise systems" of IEC/TC 65 "Industrial-process measurement, control and
automation" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-05-12
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-08-12
document have to be withdrawn
This document supersedes EN 62541-3:2015 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.
This document has been prepared under a mandate given to CENELEC by the European Commission
and the European Free Trade Association.
Endorsement notice
The text of the International Standard IEC 62541-3:2020 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 62541-11 NOTE Harmonized as EN 62541-11

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/TR 62541-1 - OPC unified architecture - Part 1: CLC/TR 62541-1 -
Overview and concepts
IEC 62541-4 - OPC Unified Architecture - Part 4: - -
Services
IEC 62541-5 - OPC Unified Architecture - Part 5: - -
Information Model
IEC 62541-6 - OPC Unified Architecture - Part 6: - -
Mappings
IEC 62541-8 - OPC Unified Architecture - Part 8: EN IEC 62541-8 -
Data Access
ISO/IEC/IEEE 2011 Information technology - - -
60559 Microprocessor Systems - Floating-
Point arithmetic
ISO 639 series Code for the representation of - -
names of languages
ISO 3166 series Codes for the representation of - -
names of countries
ISO 8601 series - -
IETF RFC 5646 - Tags for Identifying Languages - -
Unicode Standard - Unicode Normalization Forms - -
Annex #15
W3C XML Schema - Data Types - -
Definition Language
(XSD) Part 2
TAI - International Atomic Time - -

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

IEC 62541-3:2020 © IEC 2020 – 3 –
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 and VariableTypes . 57
6.1 Overview. 57
6.2 Definitions. 57
6.2.1 InstanceDeclaration . 57
6.2.2 Instances without ModellingRules . 58
6.2.3 InstanceDeclarationHierarchy . 58
6.2.4 Similar Node of InstanceDeclaration . 58
6.2.5 BrowsePath . 58
6.2.6 Attribute Handling of InstanceDeclarations . 58
6.2.7 Attribute Handling of Variable and VariableTypes . 58
6.2.8 NodeIds of InstanceDeclarations . 59
6.3 Subtyping of ObjectTypes and VariableTypes . 59
6.3.1 Overview . 59
6.3.2 Attributes . 59
6.3.3 InstanceDeclarations . 59
6.4 Instances of ObjectTypes and VariableTypes . 63
6.4.1 Overview . 63
6.4.2 Creating an Instance . 63
6.4.3 Constraints on an Instance . 64
6.4.4 ModellingRules . 65
6.5 Changing type definitions that are already used . 72
7 Standard ReferenceTypes . 73

– 4 – IEC 62541-3:2020 © IEC 2020
7.1 General . 73
7.2 References ReferenceType . 73
7.3 HierarchicalReferences ReferenceType . 74
7.4 NonHierarchicalReferences ReferenceType . 74
7.5 HasChild ReferenceType . 74
7.6 Aggregates ReferenceType . 74
7.7 HasComponent ReferenceType. 74
7.8 HasProperty ReferenceType . 75
7.9 HasOrderedComponent ReferenceType . 75
7.10 HasSubtype ReferenceType . 75
7.11 Organizes ReferenceType. 76
7.12 HasModellingRule ReferenceType . 76
7.13 HasTypeDefinition ReferenceType . 76
7.14 HasEncoding ReferenceType . 76
7.15 GeneratesEvent . 77
7.16 AlwaysGeneratesEvent . 77
7.17 HasEventSource . 77
7.18 HasNotifier . 77
8 Standard DataTypes . 79
8.1 General . 79
8.2 NodeId . 79
8.2.1 General . 79
8.2.2 NamespaceIndex . 79
8.2.3 IdentifierType . 80
8.2.4 Identifier value . 80
8.3 QualifiedName . 81
8.4 LocaleId . 81
8.5 LocalizedText . 82
8.6 Argument . 82
8.7 BaseDataType . 83
8.8 Boolean . 83
8.9 Byte . 83
8.10 ByteString . 83
8.11 DateTime . 83
8.12 Double . 83
8.13 Duration . 84
8.14 Enumeration . 84
8.15 Float . 84
8.16 Guid . 84
8.17 SByte . 84
8.18 IdType . 84
8.19 Image . 84
8.20 ImageBMP . 84
8.21 ImageGIF . 84
8.22 ImageJPG . 84
8.23 ImagePNG . 84
8.24 Integer . 85
8.25 Int16 . 85
8.26 Int32 . 85

IEC 62541-3:2020 © IEC 2020 – 5 –
8.27 Int64 . 85
8.28 TimeZoneDataType. 85
8.29 NamingRuleType . 85
8.30 NodeClass . 85
8.31 Number . 86
8.32 String . 86
8.33 Structure . 86
8.34 UInteger . 86
8.35 UInt16 . 86
8.36 UInt32 . 86
8.37 UInt64 . 86
8.38 UtcTime . 86
8.39 XmlElement . 87
8.40 EnumValueType . 87
8.41 OptionSet . 87
8.42 Union . 88
8.43 DateString . 88
8.44 DecimalString . 88
8.45 DurationString . 88
8.46 NormalizedString . 89
8.47 TimeString . 89
8.48 DataTypeDefinition . 89
8.49 StructureDefinition . 89
8.50 EnumDefinition . 90
8.51 StructureField . 90
8.52 EnumField . 91
8.53 AudioDataType . 91
8.54 Decimal . 91
8.55 PermissionType . 92
8.56 AccessRestrictionsType . 93
8.57 AccessLevelType . 93
8.58 AccessLevelExType . 94
8.59 EventNotifierType . 95
8.60 AttributeWriteMask. 95
9 Standard EventTypes . 96
9.1 General . 96
9.2 BaseEventType . 97
9.3 SystemEventType . 97
9.4 ProgressEventType . 97
9.5 AuditEventType . 98
9.6 AuditSecurityEventType . 99
9.7 AuditChannelEventType . 99
9.8 AuditOpenSecureChannelEventType . 99
9.9 AuditSessionEventType . 99
9.10 AuditCreateSessionEventType . 99
9.11 AuditUrlMismatchEventType . 100
9.12 AuditActivateSessionEventType . 100
9.13 AuditCancelEventType . 100
9.14 AuditCertificateEventType . 100

– 6 – IEC 62541-3:2020 © IEC 2020
9.15 AuditCertificateDataMismatchEventType . 100
9.16 AuditCertificateExpiredEventType . 100
9.17 AuditCertificateInvalidEventType . 100
9.18 AuditCertificateUntrustedEventType . 100
9.19 AuditCertificateRevokedEventType . 100
9.20 AuditCertificateMismatchEventType . 101
9.21 AuditNodeManagementEventType . 101
9.22 AuditAddNodesEventType . 101
9.23 AuditDeleteNodesEventType . 101
9.24 AuditAddReferencesEventType . 101
9.25 AuditDeleteReferencesEventType . 101
9.26 AuditUpdateEventType . 101
9.27 AuditWriteUpdateEventType . 101
9.28 AuditHistoryUpdateEventType . 101
9.29 AuditUpdateMethodEventType . 101
9.30 DeviceFailureEventType . 101
9.31 SystemStatusChangeEventType . 102
9.32 ModelChangeEvents . 102
9.32.1 General . 102
9.32.2 NodeVersion Property. 102
9.32.3 Views . 102
9.32.4 Event compression . 102
9.32.5 BaseModelChangeEventType . 102
9.32.6 GeneralModelChangeEventType. 103
9.32.7 Guidelines for ModelChangeEvents . 103
9.33 SemanticChangeEventType . 103
9.33.1 General . 103
9.33.2 ViewVersion and NodeVersion Properties . 103
9.33.3 Views . 103
9.33.4 Event compression . 104
Annex A (informative) How to use the Address Space Model . 105
A.1 Overview. 105
A.2 Type definitions . 105
A.3 ObjectTypes. 105
A.4 VariableTypes . 106
A.4.1 General . 106
A.4.2 Properties or DataVariables . 106
A.4.3 Many Variables and/or structured DataTypes . 106
A.5 Views . 107
A.6 Methods . 107
A.7 Defining ReferenceTypes . 107
A.8 Defining ModellingRules . 107
Annex B (informative) OPC UA Meta Model in UML . 108
B.1 Background. 108
B.2 Notation . 108
B.3 Meta Model . 110
B.3.1 Base . 110
B.3.2 ReferenceType . 110
B.3.3 Predefined ReferenceTypes. 111

IEC 62541-3:2020 © IEC 2020 – 7 –
B.3.4 Attributes . 111
B.3.5 Object and ObjectType . 112
B.3.6 EventNotifier . 113
B.3.7 Variable and VariableType . 113
B.3.8 Method . 114
B.3.9 DataType . 115
B.3.10 View . 116
Annex C (normative) Graphical notation . 117
C.1 General . 117
C.2 Notation . 117
C.2.1 Overview . 117
C.2.2 Simple notation . 117
C.2.3 Extended notation . 119
Bibliography . 122

Figure 1 – AddressSpace Node diagrams . 14
Figure 2 – OPC UA Object Model . 16
Figure 3 – AddressSpace Node Model . 17
Figure 4 – Reference Model . 18
Figure 5 – Example of a Variable defined by a VariableType . 20
Figure 6 – Example of a Complex TypeDefinition . 20
Figure 7 – Object and its Components defined by an ObjectType . 21
Figure 8 – Permissions in the Address Space . 31
Figure 9 – Symmetric and Non-Symmetric References . 33
Figure 10 – Variables, VariableTypes and their DataTypes . 52
Figure 11 – DataType Model . 52
Figure 12 – Example of DataType Modelling . 56
Figure 13 – Subtyping TypeDefinitionNodes . 60
Figure 14 – The Fully-Inherited InstanceDeclarationHierarchy for BetaType . 62
Figure 15 – An Instance and its TypeDefinitionNode . 63
Figure 16 – Example of several References between InstanceDeclarations . 64
Figure 17 – Example of changing instances based on InstanceDeclarations . 66
Figure 18 – Example of changing InstanceDeclarations based on an
InstanceDeclaration . 67
Figure 19 – Use of the Standard ModellingRule Mandatory . 68
Figure 20 – Example using the Standard ModellingRules Optional and Mandatory . 69
Figure 21 – Example of using ExposesItsArray . 70
Figure 22 – Complex example of using ExposesItsArray . 70
Figure 23 – Example using OptionalPlaceholder with an Object and Variable. 70
Figure 24 – Example using OptionalPlaceholder with a Method . 71
Figure 25 – Example of using MandatoryPlaceholder for Object and Variable . 72
Figure 26 – Standard ReferenceType Hierarchy . 73
Figure 27 – Event Reference Example . 78
Figure 28 – Complex Event Reference Example . 79
Figure 29 – Standard EventType Hierarchy . 97

– 8 – IEC 62541-3:2020 © IEC 2020
Figure 30 – Audit Behaviour of a Server. 98
Figure 31 – Audit Behaviour of an Aggregating Server . 99
Figure B.1 – Background of OPC UA Meta Model . 108
Figure B.2 – Notation (I) . 109
Figure B.3 – Notation (II) . 109
Figure B.4 – Base . 110
Figure B.5 – Reference and ReferenceType. 110
Figure B.6 – Predefined ReferenceTypes . 111
Figure B.7 – Attributes . 112
Figure B.8 – Object and ObjectType . 113
Figure B.9 – EventNotifier . 113
Figure B.10 – Variable and VariableType . 114
Figure B.11 – Method . 115
Figure B.12 – DataType . 115
Figure B.13 – View . 116
Figure C.1 – Example of a Reference connecting two Nodes . 118
Figure C.2 – Example of using a TypeDefinition inside a Node . 120
Figure C.3 – Example of exposing Attributes . 120
Figure C.4 – Example of exposing Properties inline . 121

Table 1 – NodeClass Table Conventions. 15
Table 2 – Well-known Roles .
...