OPC Unified Architecture - Part 3: Address Space Model

IEC 62541-3:2020 is available as IEC 62541-3:2020 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 62541-3:2020 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

IEC 62541-3:2020 est disponible sous forme de IEC 62541-3:2020 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
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.

General Information

Status
Published
Publication Date
07-Jul-2020
Current Stage
PPUB - Publication issued
Completion Date
08-Jul-2020
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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
IEC 62541-3:2020-07(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
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

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® Registered trademark of the International Electrotechnical Commission
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---------------------- Page: 3 ----------------------
– 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

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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

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– 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

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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

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