EN 62541-3:2015

SLOVENSKI STANDARD
01-oktober-2015
1DGRPHãþD
SIST EN 62541-3:2010
Enotna arhitektura OPC - 3. del: Model naslovnega prostora (IEC 62541-3:2015)
OPC Unified Architecture -- Part 3: Address Space Model (IEC 62541-3:2015)
OPC unified architecture - Part 3: Address Space Model (IEC 62541-3:2015)
Architecture unifiée OPC - Partie 3: Modèle de l'Espace d'Adressage (IEC 62541-
3:2015)
Ta slovenski standard je istoveten z: EN 62541-3:2015
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 62541-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2015
ICS 25.040.40; 35.100 Supersedes EN 62541-3:2010
English Version
OPC unified architecture - Part 3: Address Space Model
(IEC 62541-3:2015)
Architecture unifiée OPC - Partie 3: Modèle de l'Espace OPC Unified Architecture - Teil 3: Adressraummodell
d'Adressage (IEC 62541-3:2015)
(IEC 62541-3:2015)
This European Standard was approved by CENELEC on 2015-04-29. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, 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: Avenue Marnix 17, B-1000 Brussels
© 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 62541-3:2015 E
Foreword
The text of document 65E/374/CDV, future edition 2 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 (dop) 2016-01-29
national level by publication of an identical national
standard or by endorsement
(dow) 2018-04-29
• latest date by which the national standards conflicting with
the document have to be withdrawn

This document supersedes EN 62541-3:2010.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] 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, and supports essential requirements of EU Directive(s).
Endorsement notice
The text of the International Standard IEC 62541-3:2015 was approved by CENELEC as a European
Standard without any modification.

- 3 - EN 62541-3:2015
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When 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 - CLC/TR 62541-1 -
Part 1: Overview and concepts
IEC 62541-4 -  OPC Unified Architecture - EN 62541-4 -
Part 4: Services
IEC 62541-5 -  OPC unified architecture - EN 62541-5 -
Part 5: Information Model
IEC 62541-6 -  OPC unified architecture - EN 62541-6 -
Part 6: Mappings
IEC 62541-8 -  OPC Unified Architecture - EN 62541-8 -
Part 8: Data Access
IEC 62541-11 -  OPC unified architecture - EN 62541-11 -
Part 11: Historical Access
ISO/IEC 10918-1 -  Information technology - Digital - -
compression and coding of
continuous-tone still images:
Requirements and guidelines
ISO/IEC 15948 -  Information technology - Computer - -
graphics and image processing -
Portable Network Graphics (PNG) -
Functional specification
ISO 639 series Codes for the representation of - -
names of languages
ISO 3166 series Codes for the representation of - -
names of countries and their
subdivisions
ANSI/IEEE 754 1985 IEEE Standard for Binary Floating- - -
Point Arithmetic
Publication Year Title EN/HD Year
IETF RFC 3066 -  Tags for the Identification of - -
Languages
W3C XML Schema Part 1 -  Structures - -
W3C XML Schema Part 2 -  Datatypes - -
W3C Xpath -  XML Path Language (XPath) - -

IEC 62541-3 ®
Edition 2.0 2015-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
OPC unified architecture –
Part 3: Address Space Model
Architecture unifiee OPC –
Partie 3: Modèle de l'Espace d'Adressage

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.040.40; 35.100 ISBN 978-2-8322-2385-7

– 2 – IEC 62541-3:2015 © IEC 2015
CONTENTS
FOREWORD . 10
1 Scope . 12
2 Normative references . 12
3 Terms, definitions, abbreviations and conventions . 13
3.1 Terms and definitions . 13
3.2 Abbreviations . 14
3.3 Conventions . 14
3.3.1 Conventions for AddressSpace figures. 14
3.3.2 Conventions for defining NodeClasses . 14
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 . 20
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
5 Standard NodeClasses . 23
5.1 Overview. 23
5.2 Base NodeClass . 24
5.2.1 General. 24
5.2.2 NodeId . 24
5.2.3 NodeClass . 24
5.2.4 BrowseName . 24
5.2.5 DisplayName . 25
5.2.6 Description . 25
5.2.7 WriteMask. 25
5.2.8 UserWriteMask . 26
5.3 ReferenceType NodeClass . 26
5.3.1 General. 26
5.3.2 Attributes . 27
5.3.3 References . 28

IEC 62541-3:2015 © IEC 2015 – 3 –
5.4 View NodeClass . 29
5.5 Objects . 31
5.5.1 Object NodeClass . 31
5.5.2 ObjectType NodeClass . 33
5.5.3 Standard ObjectType FolderType . 35
5.5.4 Client-side creation of Objects of an ObjectType . 35
5.6 Variables . 35
5.6.1 General. 35
5.6.2 Variable NodeClass . 35
5.6.3 Properties . 39
5.6.4 DataVariable . 39
5.6.5 VariableType NodeClass . 40
5.6.6 Client-side creation of Variables of an VariableType . 42
5.7 Method NodeClass . 42
5.8 DataTypes . 44
5.8.1 DataType Model. 44
5.8.2 Encoding Rules for different kinds of DataTypes . 46
5.8.3 DataType NodeClass . 47
5.8.4 DataTypeDictionary, DataTypeDescription, DataTypeEncoding and
DataTypeSystem . 48
5.9 Summary of Attributes of the NodeClasses . 50
6 Type Model for ObjectTypes and VariableTypes . 51
6.1 Overview. 51
6.2 Definitions. 51
6.2.1 InstanceDeclaration . 51
6.2.2 Instances without ModellingRules . 51
6.2.3 InstanceDeclarationHierarchy . 52
6.2.4 Similar Node of InstanceDeclaration . 52
6.2.5 BrowsePath . 52
6.2.6 Attribute Handling of InstanceDeclarations . 52
6.2.7 Attribute Handling of Variable and VariableTypes . 52
6.2.8 NodeIds of InstanceDeclarations. 52
6.3 Subtyping of ObjectTypes and VariableTypes . 53
6.3.1 Overview . 53
6.3.2 Attributes . 53
6.3.3 InstanceDeclarations . 53
6.4 Instances of ObjectTypes and VariableTypes . 56
6.4.1 Overview . 56
6.4.2 Creating an Instance . 57
6.4.3 Constraints on an Instance . 57
6.4.4 ModellingRules . 58
6.5 Changing Type Definitions that are already used . 66
7 Standard ReferenceTypes . 66
7.1 General . 66
7.2 References ReferenceType . 67
7.3 HierarchicalReferences ReferenceType . 67
7.4 NonHierarchicalReferences ReferenceType . 68
7.5 HasChild ReferenceType . 68
7.6 Aggregates ReferenceType . 68

– 4 – IEC 62541-3:2015 © IEC 2015
7.7 HasComponent ReferenceType. 68
7.8 HasProperty ReferenceType . 69
7.9 HasOrderedComponent ReferenceType . 69
7.10 HasSubtype ReferenceType . 69
7.11 Organizes ReferenceType. 69
7.12 HasModellingRule ReferenceType . 70
7.13 HasTypeDefinition ReferenceType . 70
7.14 HasEncoding ReferenceType . 70
7.15 HasDescription ReferenceType . 70
7.16 GeneratesEvent . 71
7.17 AlwaysGeneratesEvent . 71
7.18 HasEventSource . 71
7.19 HasNotifier . 71
8 Standard DataTypes . 73
8.1 General . 73
8.2 NodeId . 73
8.2.1 General. 73
8.2.2 NamespaceIndex . 73
8.2.3 IdentifierType . 74
8.2.4 Identifier value . 74
8.3 QualifiedName . 75
8.4 LocaleId . 75
8.5 LocalizedText . 76
8.6 Argument . 76
8.7 BaseDataType . 76
8.8 Boolean . 76
8.9 Byte . 76
8.10 ByteString . 77
8.11 DateTime . 77
8.12 Double . 77
8.13 Duration . 77
8.14 Enumeration . 77
8.15 Float . 77
8.16 Guid . 77
8.17 SByte . 77
8.18 IdType . 77
8.19 Image . 77
8.20 ImageBMP . 78
8.21 ImageGIF . 78
8.22 ImageJPG . 78
8.23 ImagePNG . 78
8.24 Integer . 78
8.25 Int16 . 78
8.26 Int32 . 78
8.27 Int64 . 78
8.28 TimeZoneDataType. 78
8.29 NamingRuleType . 78
8.30 NodeClass . 79
8.31 Number . 79

IEC 62541-3:2015 © IEC 2015 – 5 –
8.32 String . 79
8.33 Structure . 79
8.34 UInteger . 79
8.35 UInt16 . 79
8.36 UInt32 . 79
8.37 UInt64 . 79
8.38 UtcTime . 80
8.39 XmlElement . 80
8.40 EnumValueType . 80
9 Standard EventTypes . 80
9.1 General . 80
9.2 BaseEventType . 81
9.3 SystemEventType . 81
9.4 ProgressEventType . 81
9.5 AuditEventType . 82
9.6 AuditSecurityEventType . 83
9.7 AuditChannelEventType . 83
9.8 AuditOpenSecureChannelEventType . 83
9.9 AuditSessionEventType . 83
9.10 AuditCreateSessionEventType . 84
9.11 AuditUrlMismatchEventType . 84
9.12 AuditActivateSessionEventType . 84
9.13 AuditCancelEventType . 84
9.14 AuditCertificateEventType . 84
9.15 AuditCertificateDataMismatchEventType . 84
9.16 AuditCertificateExpiredEventType . 84
9.17 AuditCertificateInvalidEventType . 84
9.18 AuditCertificateUntrustedEventType . 84
9.19 AuditCertificateRevokedEventType . 84
9.20 AuditCertificateMismatchEventType . 85
9.21 AuditNodeManagementEventType . 85
9.22 AuditAddNodesEventType . 85
9.23 AuditDeleteNodesEventType . 85
9.24 AuditAddReferencesEventType . 85
9.25 AuditDeleteReferencesEventType . 85
9.26 AuditUpdateEventType . 85
9.27 AuditWriteUpdateEventType . 85
9.28 AuditHistoryUpdateEventType . 85
9.29 AuditUpdateMethodEventType . 85
9.30 DeviceFailureEventType . 85
9.31 SystemStatusChangeEventType . 86
9.32 ModelChangeEvents . 86
9.32.1 General. 86
9.32.2 NodeVersion Property . 86
9.32.3 Views . 86
9.32.4 Event Compression . 86
9.32.5 BaseModelChangeEventType . 86
9.32.6 GeneralModelChangeEventType . 87
9.32.7 Guidelines for ModelChangeEvents . 87

– 6 – IEC 62541-3:2015 © IEC 2015
9.33 SemanticChangeEventType . 87
9.33.1 General. 87
9.33.2 ViewVersion and NodeVersion Properties . 87
9.33.3 Views . 88
9.33.4 Event Compression . 88
Annex A (informative) How to use the Address Space Model . 89
A.1 Overview. 89
A.2 Type definitions . 89
A.3 ObjectTypes. 89
A.4 VariableTypes . 90
A.4.1 General. 90
A.4.2 Properties or DataVariables . 90
A.4.3 Many Variables and / or structured DataTypes . 90
A.5 Views . 91
A.6 Methods . 91
A.7 Defining ReferenceTypes . 91
A.8 Defining ModellingRules . 91
Annex B (informative) OPC UA Meta Model in UML . 92
B.1 Background. 92
B.2 Notation . 92
B.3 Meta Model . 94
B.3.1 Base . 94
B.3.2 ReferenceType . 94
B.3.3 Predefined ReferenceTypes . 96
B.3.4 Attributes . 96
B.3.5 Object and ObjectType . 97
B.3.6 EventNotifier . 98
B.3.7 Variable and VariableType . 98
B.3.8 Method . 99
B.3.9 DataType . 100
B.3.10 View . 101
Annex C (normative) OPC Binary Type Description System . 102
C.1 Concepts . 102
C.2 Schema Description . 103
C.2.1 TypeDictionary . 103
C.2.2 TypeDescription . 103
C.2.3 OpaqueType . 104
C.2.4 EnumeratedType . 104
C.2.5 StructuredType . 105
C.2.6 FieldType . 105
C.2.7 EnumeratedValue . 107
C.2.8 ByteOrder . 107
C.2.9 ImportDirective . 107
C.3 Standard Type Descriptions . 107
C.4 Type Description Examples . 108
C.5 OPC Binary XML Schema . 110
C.6 OPC Binary Standard TypeDictionary . 111
Annex D (normative) Graphical Notation . 114

IEC 62541-3:2015 © IEC 2015 – 7 –
D.1 General . 114
D.2 Notation . 114
D.2.1 Overview . 114
D.2.2 Simple Notation . 114
D.2.3 Extended Notation . 116

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 . 19
Figure 6 – Example of a Complex TypeDefinition . 20
Figure 7 – Object and its Components defined by an ObjectType . 21
Figure 8 – Symmetric and Non-Symmetric References . 28
Figure 9 – Variables, VariableTypes and their DataTypes . 44
Figure 10 – DataType Model . 45
Figure 11 – Example of DataType Modelling . 50
Figure 12 – Subtyping TypeDefinitionNodes . 54
Figure 13 – The Fully-Inherited InstanceDeclarationHierarchy for BetaType . 55
Figure 14 – An Instance and its TypeDefinitionNode . 57
Figure 15 – Example for several References between InstanceDeclarations . 58
Figure 16 – Example on changing instances based on InstanceDeclarations . 60
Figure 17 – Example on changing InstanceDeclarations based on an
InstanceDeclaration . 61
Figure 18 – Use of the Standard ModellingRule New . 62
Figure 19 – Example using the Standard ModellingRules Optional and Mandatory . 63
Figure 20 – Example on using ExposesItsArray . 64
Figure 21 – Complex example on using ExposesItsArray . 64
Figure 22 – Example on using OptionalPlaceholder . 65
Figure 23 – Example on using MandatoryPlaceholder . 66
Figure 24 – Standard ReferenceType Hierarchy . 67
Figure 25 – Event Reference Example . 72
Figure 26 – Complex Event Reference Example . 73
Figure 27 – Standard EventType Hhierarchy . 81
Figure 28 – Audit Behaviour of a Server. 82
Figure 29 – Audit Behaviour of an Aggregating Server . 83
Figure B.1 – Background of OPC UA Meta Model . 92
Figure B.2 – Notation (I) . 93
Figure B.3 – Notation (II) . 93
Figure B.4 – Base . 94
Figure B.5 – Reference and ReferenceType. 95
Figure B.6 – Predefined ReferenceTypes . 96
Figure B.7 – Attributes . 97
Figure B.8 – Object and ObjectType . 98

– 8 – IEC 62541-3:2015 © IEC 2015
Figure B.9 – EventNotifier . 98
Figure B.10 – Variable and VariableType . 99
Figure B.11 – Method . 100
Figure B.12 – DataType . 100
Figure B.13 – View . 101
Figure C.1 – OPC Binary Dictionary Structure . 102
Figure D.1 – Example of a Reference connecting two Nodes . 115
Figure D.2 – Example of using a TypeDefinition inside a Node . 117
Figure D.3 – Example of exposing Attributes . 117
Figure D.4 – Example of exposing Properties inline . 118

Table 1 – NodeClass Table Conventions. 15
Table 2 – Base NodeClass . 24
Table 3 – Bit mask for WriteMask and UserWriteMask . 26
Table 4 – ReferenceType NodeClass . 27
Table 5 – View NodeClass . 30
Table 6 – Object NodeClass . 32
Table 7 – ObjectType NodeClass . 34
Table 8 – Variable NodeClass . 36
Table 9 – VariableType NodeClass . 41
Table 10 – Method NodeClass . 43
Table 11 – DataType NodeClass . 47
Table 12 – Overview of Attributes . 51
Table 13 – The InstanceDeclarationHierarchy for BetaType . 54
Table
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