EN IEC 62541-5:2020

OPC Unified Architecture - Part 5: Information Model

IEC 62541-5:2020 is available as IEC 62541-5:2020 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 62541-5:2020 defines the Information Model of the OPC Unified Architecture. The Information Model describes standardized Nodes of a Server’s AddressSpace. These Nodes are standardized types as well as standardized instances used for diagnostics or as entry points to server-specific Nodes. Thus, the Information Model defines the AddressSpace of an empty OPC UA Server. However, it is not expected that all Servers will provide all of these Nodes. This third edition cancels and replaces the second edition published in 2015. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) Added Annex F on User Authentication. Describes the Role Information Model that also allows configuration of Roles. b) Added new data types: "Union", "Decimal", "OptionSet", "DateString", "TimeString", "DurationString", NormalizedString", "DecimalString", and "AudioDataType". c) Added Method to request a state change in a Server. d) Added Method to set Subscription to persistent mode. e) Added Method to request resending of data from a Subscription. f) Added concept allowing to temporarily create a file to write to or read from a server in C.4. g) Added new Variable type to support Selection Lists. h) Added optional properties to FiniteStateMachineType to expose currently available states and transitions. i) Added UrisVersion Property to ServerType. This version information can be used for session-less service invocation.

OPC Unified Architecture - Teil 5: Informationsmodell

Architecture unifiée OPC - Partie 5: Modèle d'information

IEC 62541-5:2020 est disponible sous forme de IEC 62541-5:2020 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.IEC 62541-5:2020 définit le Modèle d'information de l'Architecture unifiée OPC. Le Modèle d'information décrit des Nœuds normalisés de l'AddressSpace d'un Serveur. Ces Nœuds sont des types normalisés ainsi que des instances normalisées utilisés pour le diagnostic ou comme des points d'entrée à des Nœuds spécifiques au serveur. Ainsi, le Modèle d'information définit l'AddressSpace d'un Serveur OPC UA vide. Cependant, tous les Serveurs ne sont pas supposés fournir la totalité de ces Nœuds. Cette troisième édition annule et remplace la deuxième édition parue en 2015. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: a) ajout de l'Annexe F concernant l'Authentification des utilisateurs; description du Modèle d'information de rôle qui autorise également la configuration des Rôles; b) ajout de nouveaux types de données: "Union", "Decimal", "OptionSet", "DateString", "TimeString", "DurationString", "NormalizedString", "DecimalString" et "AudioDataType"; c) ajout d'une méthode afin de demander un changement d'état dans un Serveur; d) ajout d'une méthode afin de définir un Abonnement en mode persistant; e) ajout d'une méthode afin de demander le renvoi de données à partir d'un Abonnement; f) ajout en C.4 d'un concept permettant la création temporaire d'un fichier pour l'écriture ou la lecture sur un serveur; g) ajout d'un nouveau type de Variable afin de prendre en charge les Listes de sélection; h) ajout de propriétés facultatives au FiniteStateMachineType afin de présenter les états et transitions actuellement disponibles; i) ajout d'une propriété UrisVersion au ServerType. Ces informations de version peuvent être utilisées pour l'invocation de services sans session.

Enotna arhitektura OPC - 5. del: Informacijski model

General Information

• Status: Published
• Publication Date: 17-Sep-2020
• ICS: 25.040.40 - Industrial process measurement and control
• ICS: 35.100 - Open systems interconnection (OSI)
• ICS: 35.100.05 - Multilayer applications
• Technical Committee: CLC/TC 65X - Industrial-process measurement, control and automation
• Drafting Committee: IEC/SC 65E - IEC_SC_65E
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 18-Sep-2020
• Completion Date: 18-Sep-2020
• Mandate: M/490 - Standardisation mandate to the European Standardisation Organisations (ESOs) to support European Smart Grid deployment
• Ref Project: SIST EN IEC 62541-5:2020 - OPC Unified Architecture - Part 5: Information Model

Relations

• Replaces: EN 62541-5:2015 - OPC unified architecture - Part 5: Information Model
• Effective Date: 22-Sep-2020
• Revised: prEN IEC 62541-5:2024 - OPC unified architecture - Part 5: Information model
• Effective Date: 31-Jan-2023

Overview

EN IEC 62541-5:2020 - "OPC Unified Architecture (OPC UA) - Part 5: Information Model" defines the standard Information Model for OPC UA servers. It specifies the standardized Nodes (types and instances) that populate a Server’s AddressSpace, including object types, variable types, event and audit types, and diagnostic structures. This third edition replaces the 2015 version and provides a technical revision that clarifies and extends the OPC UA Information Model.

Key Topics and Technical Highlights

• AddressSpace and Node descriptions: Definitions and conventions for NodeIds, BrowseNames, common attributes for Objects, Variables, VariableTypes and Methods that form an empty OPC UA Server’s AddressSpace.
• Standard ObjectTypes and VariableTypes: Detailed types for Server diagnostics, Session and Subscription diagnostics, redundancy, namespaces and more (e.g., ServerType, ServerDiagnosticsType, SubscriptionDiagnosticsType).
• Events and Audit Model: ObjectTypes used as EventTypes (BaseEventType, AuditEventType and numerous audit subtypes) for security and operational logging.
• New features in the 2020 edition:
  • Annex F: User Authentication and a Role Information Model to support role configuration.
  • New data types: Union, Decimal, OptionSet, DateString, TimeString, DurationString, NormalizedString, DecimalString, AudioDataType.
  • New Methods: request server state change; set Subscription to persistent mode; request resending of Subscription data.
  • Temporary file concept for server read/write (Annex C.4), Selection List VariableType support, optional FSM properties exposing available states/transitions, and UrisVersion property on ServerType for session-less invocation.
• Conformance and modelling rules: Expectations on what nodes a compliant server defines - the Information Model defines a comprehensive AddressSpace but not all Servers must implement every node.

Practical Applications and Who Uses It

• Industrial automation & process control: Establishes interoperable information models for PLCs, SCADA, DCS and IIoT gateways.
• Software vendors and system integrators: Implement and verify server AddressSpace design, diagnostics and event/audit capabilities.
• Device manufacturers: Map device data and states to standardized OPC UA Nodes and types for out-of-the-box integration.
• Security and operations teams: Use the audit/event and user authentication models to meet operational and compliance requirements.
• Application developers: Build clients that browse, subscribe, and interact with standardized Node types, persistent subscriptions, and new data types.

Related Standards

Part of the IEC 62541 OPC UA series. Relevant companion standards include:

• IEC 62541-1 (Overview & concepts)
• IEC 62541-3 (AddressSpace Model)
• IEC 62541-4 (Services)
• IEC 62541-6 (Mappings)
• IEC 62541-7 (Profiles)
• Other parts covering Alarms & Conditions, Programs, Historical Access, etc.

Keywords: EN IEC 62541-5:2020, OPC Unified Architecture, OPC UA Information Model, AddressSpace, Node, ServerType, Subscription, User Authentication, industrial automation.

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2020
Nadomešča:
SIST EN 62541-5:2015
Enotna arhitektura OPC - 5. del: Informacijski model
OPC Unified Architecture - Part 5: Information Model
OPC Unified Architecture - Teil 5: Informationsmodell
Architecture unifiée OPC - Partie 5: Modèle d'informations
Ta slovenski standard je istoveten z: EN IEC 62541-5:2020
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 62541-5

NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2020
ICS 35.100.05; 25.040.40 Supersedes EN 62541-5:2015 and all of its amendments
and corrigenda (if any)
English Version
OPC Unified Architecture - Part 5: Information Model
(IEC 62541-5:2020)
Architecture unifiée OPC - Partie 5: Modèle d'information OPC Unified Architecture - Teil 5: Informationsmodell
(IEC 62541-5:2020) (IEC 62541-5:2020)
This European Standard was approved by CENELEC on 2020-08-14. 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 62541-5:2020 E

European foreword
The text of document 65E/717/FDIS, future edition 3 of IEC 62541-5, 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) 2021-05-14
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-08-14
document have to be withdrawn
This document supersedes EN 62541-5:2015 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 62541-5:2020 was approved by CENELEC as a European
Standard without any modification.
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: Overview CLC/TR 62541-1 -
and concepts
IEC 62541-3 - OPC Unified Architecture - Part 3: Address EN IEC 62541-3 -
Space Model
IEC 62541-4 - OPC Unified Architecture - Part 4: Services EN IEC 62541-4 -
IEC 62541-6 - OPC Unified Architecture - Part 6: EN IEC 62541-6 -
Mappings
IEC 62541-7 - OPC unified architecture - Part 7: Profiles EN IEC 62541-7 -
IEC 62541-9 - OPC Unified Architecture - Part 9: Alarms EN IEC 62541-9 -
and Conditions
IEC 62541-10 - OPC Unified Architecture - Part 10: EN IEC 62541-10 -
Programs
IEC 62541-11 - OPC Unified Architecture - Part 11: EN IEC 62541-11 -
Historical Access
ISO/IEC/IEEE 2011 Information technology - Microprocessor - -
60559 Systems - Floating-Point arithmetic
IETF RFC 2045 - Multipurpose Internet Mail Extensions - -
(MIME) Part 1: Format of Internet Message
Bodies
IETF RFC 2046 - Multipurpose Internet Mail Extensions - -
(MIME) - Part Two: Media Types
Publication Year Title EN/HD Year
IETF RFC 2047 - Multipurpose Internet Mail Extensions - - -
Part Three: Message Header Extensions
for Non-ASCII Text
XML-1 - XML Schema Part 1: Structures, W3C - -
XML-2 - XML Schema Part 2: Datatypes, W3C - -
W3C Xpath - XML Path Language (XPath) - -
IETF RFC 3629 - UTF-8, a transformation format of ISO - -
IEC 62541-5 ®
Edition 3.0 2020-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
OPC unified architecture –
Part 5: Information Model
Architecture unifiée OPC –
Partie 5: Modèle d'information

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.040.40; 35.100.05 ISBN 978-2-8322-8592-3

– 2 – IEC 62541-5:2020 © IEC 2020

CONTENTS
FOREWORD . 14
1 Scope . 16
2 Normative references . 16
3 Terms, definitions, abbreviated terms and conventions . 17
3.1 Terms and definitions . 17
3.2 Abbreviated terms . 17
3.3 Conventions for Node descriptions . 17
4 NodeIds and BrowseNames . 19
4.1 NodeIds . 19
4.2 BrowseNames . 19
5 Common Attributes . 19
5.1 General . 19
5.2 Objects . 20
5.3 Variables . 20
5.4 VariableTypes . 21
5.5 Methods . 21
6 Standard ObjectTypes . 21
6.1 General . 21
6.2 BaseObjectType . 22
6.3 ObjectTypes for the Server Object . 22
6.3.1 ServerType . 22
6.3.2 ServerCapabilitiesType . 25
6.3.3 ServerDiagnosticsType . 28
6.3.4 SessionsDiagnosticsSummaryType . 29
6.3.5 SessionDiagnosticsObjectType . 29
6.3.6 VendorServerInfoType . 30
6.3.7 ServerRedundancyType. 30
6.3.8 TransparentRedundancyType . 31
6.3.9 NonTransparentRedundancyType . 31
6.3.10 NonTransparentNetworkRedundancyType . 32
6.3.11 OperationLimitsType . 33
6.3.12 AddressSpaceFileType . 34
6.3.13 NamespaceMetadataType . 35
6.3.14 NamespacesType . 36
6.4 ObjectTypes used as EventTypes . 37
6.4.1 General . 37
6.4.2 BaseEventType . 37
6.4.3 AuditEventType . 40
6.4.4 AuditSecurityEventType . 41
6.4.5 AuditChannelEventType . 42
6.4.6 AuditOpenSecureChannelEventType . 42
6.4.7 AuditSessionEventType . 43
6.4.8 AuditCreateSessionEventType. 44
6.4.9 AuditUrlMismatchEventType . 45
6.4.10 AuditActivateSessionEventType . 45

IEC 62541-5:2020 © IEC 2020 – 3 –
6.4.11 AuditCancelEventType . 46
6.4.12 AuditCertificateEventType . 47
6.4.13 AuditCertificateDataMismatchEventType . 47
6.4.14 AuditCertificateExpiredEventType . 48
6.4.15 AuditCertificateInvalidEventType . 48
6.4.16 AuditCertificateUntrustedEventType . 48
6.4.17 AuditCertificateRevokedEventType . 49
6.4.18 AuditCertificateMismatchEventType . 49
6.4.19 AuditNodeManagementEventType . 50
6.4.20 AuditAddNodesEventType . 50
6.4.21 AuditDeleteNodesEventType . 50
6.4.22 AuditAddReferencesEventType . 51
6.4.23 AuditDeleteReferencesEventType. 51
6.4.24 AuditUpdateEventType . 52
6.4.25 AuditWriteUpdateEventType . 52
6.4.26 AuditHistoryUpdateEventType . 53
6.4.27 AuditUpdateMethodEventType . 54
6.4.28 SystemEventType . 54
6.4.29 DeviceFailureEventType . 54
6.4.30 SystemStatusChangeEventType . 55
6.4.31 BaseModelChangeEventType . 55
6.4.32 GeneralModelChangeEventType. 56
6.4.33 SemanticChangeEventType . 56
6.4.34 EventQueueOverflowEventType . 57
6.4.35 ProgressEventType . 57
6.5 ModellingRuleType . 58
6.6 FolderType . 58
6.7 DataTypeEncodingType . 58
6.8 AggregateFunctionType . 58
7 Standard VariableTypes . 59
7.1 General . 59
7.2 BaseVariableType . 59
7.3 PropertyType . 59
7.4 BaseDataVariableType . 60
7.5 ServerVendorCapabilityType . 60
7.6 ServerStatusType . 61
7.7 BuildInfoType . 61
7.8 ServerDiagnosticsSummaryType . 62
7.9 SamplingIntervalDiagnosticsArrayType . 63
7.10 SamplingIntervalDiagnosticsType . 63
7.11 SubscriptionDiagnosticsArrayType . 63
7.12 SubscriptionDiagnosticsType . 64
7.13 SessionDiagnosticsArrayType . 65
7.14 SessionDiagnosticsVariableType . 66
7.15 SessionSecurityDiagnosticsArrayType . 69
7.16 SessionSecurityDiagnosticsType . 69
7.17 OptionSetType . 70
7.18 SelectionListType . 71
7.19 AudioVariableType . 72

– 4 – IEC 62541-5:2020 © IEC 2020
8 Standard Objects and their Variables . 73
8.1 General . 73
8.2 Objects used to organise the AddressSpace structure . 73
8.2.1 Overview . 73
8.2.2 Root . 73
8.2.3 Views . 74
8.2.4 Objects . 74
8.2.5 Types . 75
8.2.6 ObjectTypes . 75
8.2.7 VariableTypes . 76
8.2.8 ReferenceTypes . 77
8.2.9 DataTypes . 78
8.2.10 EventTypes . 78
8.3 Server Object and its containing Objects . 79
8.3.1 General . 79
8.3.2 Server Object . 80
8.4 ModellingRule Objects . 80
8.4.1 ExposesItsArray . 80
8.4.2 Mandatory . 81
8.4.3 Optional . 81
8.4.4 OptionalPlaceholder . 81
8.4.5 MandatoryPlaceholder . 82
9 Standard Methods . 82
9.1 GetMonitoredItems . 82
9.2 ResendData . 83
9.3 SetSubscriptionDurable . 83
9.4 RequestServerStateChange . 84
10 Standard Views . 85
11 Standard ReferenceTypes . 85
11.1 References . 85
11.2 HierarchicalReferences . 86
11.3 NonHierarchicalReferences . 86
11.4 HasChild . 87
11.5 Aggregates . 87
11.6 Organizes . 87
11.7 HasComponent . 87
11.8 HasOrderedComponent . 88
11.9 HasProperty . 88
11.10 HasSubtype . 88
11.11 HasModellingRule . 89
11.12 HasTypeDefinition. 89
11.13 HasEncoding . 89
11.14 HasEventSource . 90
11.15 HasNotifier . 90
11.16 GeneratesEvent . 90
11.17 AlwaysGeneratesEvent . 91
12 Standard DataTypes . 91
12.1 Overview. 91

IEC 62541-5:2020 © IEC 2020 – 5 –
12.2 DataTypes defined in IEC 62541‑3 . 91
12.3 DataTypes defined in IEC 62541‑4 . 98
12.4 BuildInfo . 99
12.5 RedundancySupport . 99
12.6 ServerState . 100
12.7 RedundantServerDataType . 101
12.8 SamplingIntervalDiagnosticsDataType . 101
12.9 ServerDiagnosticsSummaryDataType . 102
12.10 ServerStatusDataType . 102
12.11 SessionDiagnosticsDataType . 103
12.12 SessionSecurityDiagnosticsDataType . 106
12.13 ServiceCounterDataType . 107
12.14 StatusResult . 107
12.15 SubscriptionDiagnosticsDataType . 107
12.16 ModelChangeStructureDataType . 109
12.17 SemanticChangeStructureDataType . 110
12.18 BitFieldMaskDataType . 110
12.19 NetworkGroupDataType . 110
12.20 EndpointUrlListDataType . 111
12.21 KeyValuePair . 111
12.22 EndpointType . 112
Annex A (informative) Design decisions when modelling the server information . 113
A.1 Overview. 113
A.2 ServerType and Server Object . 113
A.3 Typed complex Objects beneath the Server Object . 113
A.4 Properties versus DataVariables . 113
A.5 Complex Variables using complex DataTypes . 114
A.6 Complex Variables having an array . 114
A.7 Redundant information . 114
A.8 Usage of the BaseDataVariableType . 115
A.9 Subtyping . 115
A.10 Extensibility mechanism . 115
Annex B (normative) StateMachines . 116
B.1 General . 116
B.2 Examples of finite state machines . 116
B.2.1 Simple state machine . 116
B.2.2 State machine containing substates . 117
B.3 Definition of state machine . 118
B.4 Representation of state machines in the AddressSpace . 118
B.4.1 Overview . 118
B.4.2 StateMachineType . 119
B.4.3 StateVariableType . 120
B.4.4 TransitionVariableType . 121
B.4.5 FiniteStateMachineType . 122
B.4.6 FiniteStateVariableType . 124
B.4.7 FiniteTransitionVariableType . 125
B.4.8 StateType . 126
B.4.9 InitialStateType . 126
B.4.10 TransitionType . 127

– 6 – IEC 62541-5:2020 © IEC 2020
B.4.11 FromState. 127
B.4.12 ToState. 128
B.4.13 HasCause . 128
B.4.14 HasEffect . 129
B.4.15 HasSubStateMachine . 129
B.4.16 TransitionEventType . 130
B.4.17 AuditUpdateStateEventType . 130
B.4.18 Special Restrictions on subtyping StateMachines . 131
B.4.19 Specific StatusCodes for StateMachines . 131
B.5 Examples of StateMachines in the AddressSpace . 132
B.5.1 StateMachineType using inheritance . 132
B.5.2 StateMachineType with a SubStateMachine using inheritance . 133
B.5.3 StateMachineType using containment . 134
B.5.4 Example of a StateMachine having Transition to SubStateMachine . 134
Annex C (normative) File Transfer . 137
C.1 Overview. 137
C.2 FileType . 137
C.2.1 General . 137
C.2.2 Open . 138
C.2.3 Close . 139
C.2.4 Read . 140
C.2.5 Write. 141
C.2.6 GetPosition . 142
C.2.7 SetPosition . 142
C.3 File System . 143
C.3.1 FileDirectoryType . 143
C.3.2 FileSystem Object . 144
C.3.3 CreateDirectory . 144
C.3.4 CreateFile . 145
C.3.5 Delete . 146
C.3.6 MoveOrCopy . 147
C.4 Temporary file transfer . 148
C.4.1 TemporaryFileTransferType . 148
C.4.2 File transfer sequences . 149
C.4.3 GenerateFileForRead . 150
C.4.4 GenerateFileForWrite . 151
C.4.5 CloseAndCommit . 151
C.4.6 FileTransferStateMachineType . 152
C.4.7 Reset . 155
Annex D (normative) DataTypeDictionary. 156
D.1 Overview. 156
D.2 Data Type Model . 156
D.3 DataTypeDictionary, DataTypeDescription, DataTypeEncoding and
DataTypeSystem. 157
D.4 AddressSpace organization. 159
D.5 Node definitions . 161
D.5.1 HasDescription . 161
D.5.2 DataTypeDictionaryType . 161
D.5.3 DataTypeDescriptionType . 162

IEC 62541-5:2020 © IEC 2020 – 7 –
D.5.4 DataTypeSystemType . 162
D.5.5 OPC Binary . 162
D.5.6 XML Schema . 163
Annex E (normative) OPC Binary Type Description System . 164
E.1 Concepts . 164
E.2 Schema description . 165
E.2.1 TypeDictionary . 165
E.2.2 TypeDescription . 165
E.2.3 OpaqueType . 166
E.2.4 EnumeratedType . 166
E.2.5 StructuredType . 167
E.2.6 FieldType . 167
E.2.7 EnumeratedValue . 169
E.2.8 ByteOrder . 169
E.2.9 ImportDirective . 170
E.3 Standard Type descriptions . 170
E.4 Type description examples . 171
E.4.1 A 128-bit signed integer . 171
E.4.2 A 16-bit value divided into several fields . 171
E.4.3 A structured type with optional fields . 171
E.4.4 An array of integers . 171
E.4.5 An array of integers with a terminator instead of a length prefix . 171
E.4.6 A simple union . 171
E.4.7 An enumerated type . 172
E.4.8 A nillable array . 172
E.5 OPC Binary XML schema . 172
E.6 OPC Binary Standard TypeDictionary . 174
Annex F (normative) User Authorization . 176
F.1 Overview. 176
F.2 RoleSetType . 176
F.2.1 RoleSetType definition . 176
F.2.2 AddRole Method . 176
F.2.3 RemoveRole Method . 177
F.3 RoleType . 178
F.3.1 RoleType definition . 178
F.3.2 IdentityMappingRuleType . 179
F.3.3 AddIdentity Method . 180
F.3.4 RemoveIdentity Method . 180
F.3.5 AddApplication Method . 181
F.3.6 RemoveApplication Method . 181
F.3.7 AddEndpoint Method . 182
F.3.8 RemoveEndpoint Method . 182
F.4 RoleMappingRuleChangedAuditEventType . 183

Figure 1 – Standard AddressSpace structure . 73
Figure 2 – Views organization . 74
Figure 3 – Objects organization . 75
Figure 4 – ObjectTypes organization . 76

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Figure 5 – VariableTypes organization . 76
Figure 6 – ReferenceType definitions . 77
Figure 7 – EventTypes organization . 78
Figure 8 – Excerpt of diagnostic information of the Server . 80
Figure B.1 – Example of a simple state machine . 117
Figure B.2 – Example of a state machine having a sub-machine . 117
Figure B.3 – The StateMachine Information Model . 119
Figure B.4 – Example of a FiniteStateMachine type . 124
Figure B.5 – Example of a FiniteStateMachine instance . 124
Figure B.6 – Example of an initial State in a sub-machine . 126
Figure B.7 – Example of a StateMachineType using inheritance . 132
Figure B.8 – Example of a StateMachineType with a SubStateMachine using
inheritance . 133
Figure B.9 – Example of a StateMachineType using containment . 134
Figure B.10 – Example of a StateMachine with Transitions from sub-states . 135
Figure B.11 – Example of a StateMachineType having Transition to SubStateMachine . 136
Figure C.1 – FileSystem example . 144
Figure C.2 – Read file transfer example sequence . 149
Figure C.3 – Write file transfer example sequence . 149
Figure C.4 – File transfer States . 152
Figure C.5 – FileTransferStateMachineType . 153
Figure D.1 – DataType model . 156
Figure D.2 – Example of DataType modelling . 159
Figure D.3 – DataTypes organization . 160
Figure E.1 – OPC Binary Dictionary structure .
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