EN 62541-3:2010

SLOVENSKI STANDARD
01-december-2010
Poenotena arhitektura OPC - 3. del: Model naslovnega prostora (IEC 62541-3:2010)
OPC unified architecture - Part 3: Address space model (IEC 62541-3:2010)
OPC Unified Architecture - Teil 3: Adressraummodell (IEC 62541-3:2010)
Architecture unifiée OPC -- Partie 3: Modèle d'espace d'adressage (CEI 62541-3:2010)
Ta slovenski standard je istoveten z: EN 62541-3:2010
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
October 2010
EUROPÄISCHE NORM
ICS 25.040.40; 35.100
English version
OPC unified architecture -
Part 3: Address Space Model
(IEC 62541-3:2010)
Architecture unifiée OPC -  OPC Unified Architecture -
Partie 3: Modèle d'espace d'adressage Teil 3: Adressraummodell
(CEI 62541-3:2010) (IEC 62541-3:2010)

This European Standard was approved by CENELEC on 2010-10-01. 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 Central Secretariat 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 Central Secretariat 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, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62541-3:2010 E
Foreword
The text of document 64E/160/FDIS, future edition 1 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 was approved by CENELEC as EN 62541-3 on
2010-10-01.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2011-07-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2013-10-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 62541-3:2010 was approved by CENELEC as a European
Standard without any modification.
__________
- 3 - EN 62541-3:2010
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

1) 2)
IEC 62541-4 200X OPC unified architecture - EN 62541-4 200X
Part 4: Services
1) 2)
IEC 62541-5 200X OPC unified architecture - EN 62541-5 200X
Part 5: Information model
1) 2)
IEC 62541-6 200X OPC unified architecture - EN 62541-6 200X
Part 6: Mappings
1) 2)
IEC 62541-8 200X OPC unified architecture - EN 62541-8 200X
Part 8: Data access
IEC/TR 62541-1 - OPC unified architecture - CLC/TR 62541-1 -
Part 1: Overview and concepts
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 EN ISO 3166 Series
countries and their subdivivions

IEEE 754 1985 Binary Floating-Point Arithmetic - -

1)
To be published.
2)
At draft stage.
IEC 62541-3 ®
Edition 1.0 2010-07
INTERNATIONAL
STANDARD
OPC unified architecture –
Part 3: Address Space Model
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
XE
ICS 25.040.40; 35.100 ISBN 978-2-88912-081-9
– 2 – 62541-3 © IEC:2010(E)
CONTENTS
FOREWORD.9
INTRODUCTION.11
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.19
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

62541-3 © IEC:2010(E) – 3 –
5.3.3 References.28
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 .40
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.51
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
6.3 Subtyping of ObjectTypes and VariableTypes.52
6.3.1 Overview .52
6.3.2 Attributes.52
6.3.3 InstanceDeclarations .53
6.4 Instances of ObjectTypes and VariableTypes .56
6.4.1 Overview .56
6.4.2 Creating an Instance .56
6.4.3 Constraints on an Instance .57
6.4.4 ModellingRules.58
6.5 Changing Type Definitions that are already used.64
6.6 ModelParent.64
7 Standard ReferenceTypes .65
7.1 General .65
7.2 References ReferenceType .66
7.3 HierarchicalReferences ReferenceType.66
7.4 NonHierarchicalReferences ReferenceType .67
7.5 HasChild ReferenceType.67

– 4 – 62541-3 © IEC:2010(E)
7.6 Aggregates ReferenceType .67
7.7 HasComponent ReferenceType .67
7.8 HasProperty ReferenceType.68
7.9 HasOrderedComponent ReferenceType .68
7.10 HasSubtype ReferenceType .68
7.11 Organizes ReferenceType .68
7.12 HasModellingRule ReferenceType.69
7.13 HasModelParent ReferenceType .69
7.14 HasTypeDefinition ReferenceType .69
7.15 HasEncoding ReferenceType .69
7.16 HasDescription ReferenceType .70
7.17 GeneratesEvent .70
7.18 AlwaysGeneratesEvent .70
7.19 HasEventSource .70
7.20 HasNotifier .71
8 Standard DataTypes.72
8.1 General .72
8.2 NodeId .72
8.2.1 General .72
8.2.2 NamespaceIndex.72
8.2.3 IdentifierType .73
8.2.4 Identifier value.73
8.3 QualifiedName .74
8.4 LocaleId .74
8.5 LocalizedText.74
8.6 Argument .75
8.7 BaseDataType.75
8.8 Boolean.75
8.9 Byte .75
8.10 ByteString .75
8.11 DateTime .76
8.12 Double .76
8.13 Duration .76
8.14 Enumeration.76
8.15 Float.76
8.16 Guid .76
8.17 SByte .76
8.18 IdType.76
8.19 Image.76
8.20 ImageBMP .76
8.21 ImageGIF .76
8.22 ImageJPG .76
8.23 ImagePNG .77
8.24 Integer .77
8.25 Int16.77
8.26 Int32.77
8.27 Int64.77
8.28 TimeZoneDataType .77
8.29 NamingRuleType.77

62541-3 © IEC:2010(E) – 5 –
8.30 NodeClass .77
8.31 Number .78
8.32 String .78
8.33 Structure .78
8.34 UInteger .78
8.35 UInt16 .78
8.36 UInt32 .78
8.37 UInt64 .78
8.38 UtcTime .78
8.39 XmlElement.78
9 Standard EventTypes .79
9.1 General .79
9.2 BaseEventType .80
9.3 SystemEventType .80
9.4 AuditEventType .80
9.5 AuditSecurityEventType .81
9.6 AuditChannelEventType .82
9.7 AuditOpenSecureChannelEventType.82
9.8 AuditSessionEventType.82
9.9 AuditCreateSessionEventType .82
9.10 AuditUrlMismatchEventType.82
9.11 AuditActivateSessionEventType .82
9.12 AuditCancelEventType .82
9.13 AuditCertificateEventType .82
9.14 AuditCertificateDataMismatchEventType .82
9.15 AuditCertificateExpiredEventType .82
9.16 AuditCertificateInvalidEventType .83
9.17 AuditCertificateUntrustedEventType .83
9.18 AuditCertificateRevokedEventType.83
9.19 AuditCertificateMismatchEventType .83
9.20 AuditNodeManagementEventType.83
9.21 AuditAddNodesEventType .83
9.22 AuditDeleteNodesEventType .83
9.23 AuditAddReferencesEventType .83
9.24 AuditDeleteReferencesEventType .83
9.25 AuditUpdateEventType.83
9.26 AuditWriteUpdateEventType.83
9.27 AuditHistoryUpdateEventType .84
9.28 AuditUpdateMethodEventType .84
9.29 DeviceFailureEventType.84
9.30 ModelChangeEvents .84
9.30.1 General .84
9.30.2 NodeVersion Property .84
9.30.3 Views .84
9.30.4 Event Compression .84
9.30.5 BaseModelChangeEventType.85
9.30.6 GeneralModelChangeEventType .85
9.30.7 Guidelines for ModelChangeEvents .85
9.31 SemanticChangeEventType .85

– 6 – 62541-3 © IEC:2010(E)
9.31.1 General .85
9.31.2 ViewVersion and NodeVersion Properties.85
9.31.3 Views .86
9.31.4 Event Compression .86
Annex A (informative) How to use the Address Space Model .87
Annex B (informative) OPC UA Meta Model in UML .90
Annex C (normative) OPC Binary Type Description System .100
Annex D (normative) Graphical Notation .112
Bibliography.117

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.53
Figure 13 – The Fully-Inherited InstanceDeclarationHierarchy for BetaType .55
Figure 14 – An Instance and its TypeDefinitionNode .56
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 ModelParents.65
Figure 23 – Standard ReferenceType Hierarchy.66
Figure 24 – Event Reference Example .71
Figure 25 – Complex Event Reference Example .72
Figure 26 – Standard EventType Hierarchy.79
Figure 27 – Audit Behaviour of a Server .80
Figure 28 – Audit Behaviour of an Aggregating Server.81
Figure B.1 – Background of OPC UA Meta Model .90
Figure B.2 – Notation (I) .91
Figure B.3 – Notation (II) .91
Figure B.4 – BaseNode.92
Figure B.5 – Reference and ReferenceType .93

62541-3 © IEC:2010(E) – 7 –
Figure B.6 – Predefined ReferenceTypes.94
Figure B.7 – Attributes .95
Figure B.8 – Object and ObjectType .96
Figure B.9 – EventNotifier.96
Figure B.10 – Variable and VariableType.97
Figure B.11 – Method .98
Figure B.12 – DataType .99
Figure B.13 – View .99
Figure C.1 – OPC Binary Dictionary Structure.100
Figure D.1 – Example of a Reference connecting two Nodes . 113
Figure D.2 – Example of using a TypeDefinition inside a Node .115
Figure D.3 – Example of exposing Attributes.115
Figure D.4 – Example of exposing Properties inline . 116

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 about Attributes .51
Table 13 – The InstanceDeclarationHierarchy for BetaType .54
Table 14 – The Fully-Inherited InstanceDeclarationHierarchy for BetaType.54
Table 15 – Rule for ModellingRules Properties when Subtyping.59
Table 16 – Properties of ModellingRules.61
Table 17 – NodeId Definition.72
Table 18 – IdentifierType Values.73
Table 19 – NodeId Null Values.73
Table 20 – QualifiedName Definition.74
Table 21 –LocaleId Examples .74
Table 22 – LocalizedText Definition .75
Table 23 – Argument Definition.75
Table 24 – TimeZoneDataType Definition .77
Table 25 – NamingRuleType Values .77
Table 26 – NodeClass Values .78
Table C.1 – TypeDictionary Components .101
Table C.2 – TypeDescription Components .102
Table C.3 – OpaqueType Components.102

– 8 – 62541-3 © IEC:2010(E)
Table C.4 – EnumeratedType Components .103
Table C.5 – StructuredType Components.103
Table C.6 – FieldType Components .104
Table C.7 – EnumeratedValue Components.105
Table C.8 – ImportDirective Components.105
Table C.9 – Standard Type Descriptions .106
Table D.1 – Notation of Nodes depending on the NodeClass . 113
Table D.2 – Simple Notation of Nodes depending on the NodeClass.114

62541-3 © IEC:2010(E) – 9 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPC UNIFIED ARCHITECTURE –
Part 3: Address Space Model
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62541-3 has been prepared by subcommittee 65E: Devices and
integration in enterprise systems of IEC technical committee 65: Industrial-process
measurement, control and automation.
The text of this standard is based on the following documents:
FDIS Report on voting
65E/160/FDIS 65E/164/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 62541 series, under the general title OPC Unified Architecture,
can be found on the IEC website.

-------
...