SIST EN IEC 62541-19:2026

OPC unified architecture - Part 19: Dictionary Reference (IEC 62541-19:2025)

IEC 62541-19: 2025 defines an Information Model of the OPC Unified Architecture. The Information Model describes the basic infrastructure to reference from an OPC UA Information Model to external dictionaries like IEC Common Data Dictionary or ECLASS.

OPC Unified Architecture - Teil 19: Wörterbuch Referenz (IEC 62541-19:2025)

Architecture unifiée OPC - Partie 19: Référence de dictionnaire (IEC 62541-19:2025)

IEC 62541-19: 2025 définit le Modèle d'information de l'Architecture unifiée OPC. Le Modèle d'information définit l'infrastructure de base pour une référence allant d'un Modèle d'information OPC UA à des dictionnaires externes comme le Dictionnaire de données communes de l'IEC ou ECLASS.

Enotna arhitektura OPC - 19. del: Slovarska zveza (IEC 62541-19:2025)

IEC 62541-19: 2025 določa informacijski model za OPC Unified Architecture. Informacijski model opisuje osnovno infrastrukturo za sklicevanje iz informacijskega modela OPC UA na zunanje slovarje, kot sta IEC Common Data Dictionary ali ECLASS.

General Information

• Status: Published
• Public Enquiry End Date: 30-Mar-2024
• Publication Date: 12-Apr-2026
• ICS: 25.040 - Industrial automation systems
• ICS: 25.040.40 - Industrial process measurement and control
• ICS: 35.240.50 - IT applications in industry
• Technical Committee: MOV - Measuring equipment for electromagnetic quantities
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 03-Feb-2026
• Due Date: 10-Apr-2026
• Completion Date: 13-Apr-2026
• Ref Project: EN IEC 62541-19:2026 - OPC unified architecture - Part 19: Dictionary Reference

Relations

• Refers: SIST EN IEC 62541-5:2026 - OPC unified architecture - Part 5: Information model (IEC 62541-5:2026)
• Effective Date: 20-Feb-2026
• Refers: SIST EN IEC 62541-3:2020 - OPC unified architecture - Part 3: Address Space Model (IEC 62541-3:2020)
• Effective Date: 10-Feb-2026
• Refers: SIST EN IEC 62541-8:2020 - OPC Unified Architecture - Part 8: Data Access (IEC 62541-8:2020)
• Effective Date: 10-Feb-2026
• Refers: SIST EN 16304:2014 - Automatic vent valves for gas burners and gas burning appliances
• Effective Date: 09-Feb-2026
• Refers: SIST EN IEC 62541-5:2020 - OPC Unified Architecture - Part 5: Information Model
• Effective Date: 03-Feb-2026
• Refers: SIST EN IEC 62541-3:2026 - OPC unified architecture - Part 3: Address space model (IEC 62541-3:2025)
• Effective Date: 03-Feb-2026
• Refers: SIST EN IEC 62541-1:2026 - OPC unified architecture - Part 1: Overview and concepts (IEC 62541-1:2025)
• Effective Date: 03-Feb-2026
• Referred By: SIST EN IEC 62769-1:2023 - Field Device Integration (FDI®) - Part 1: Overview (IEC 62769-1:2023)
• Effective Date: 03-Feb-2026
• Referred By: SIST EN IEC 62769-7:2021 - Field Device Integration (FDI) - Part 7: Communication devices (IEC 62769-7:2021)
• Effective Date: 03-Feb-2026
• Referred By: SIST EN IEC 62541-7:2026 - OPC Unified Architecture - Part 7: Profiles (IEC 62541-7:2025)
• Effective Date: 03-Feb-2026
• Referred By: SIST EN 62769-1:2015 - Devices and integration in enterprise systems; Field Device Integration - Part 1: Overview (IEC 62769-1:2015)
• Effective Date: 03-Feb-2026
• Referred By: SIST EN IEC 62541-8:2026 - OPC unified architecture - Part 8: Data access (IEC 62541-8:2025)
• Effective Date: 03-Feb-2026
• Referred By: SIST EN 62769-7:2015 - Devices and integration in enterprise systems; Field Device Integration - Part 7: Communication Devices (IEC 62769-7:2015)
• Effective Date: 03-Feb-2026
• Referred By: SIST EN IEC 62769-6:2021 - Field Device Integration (FDI) - Part 6: Technology Mapping (IEC 62769-6:2021
• Effective Date: 03-Feb-2026

Overview

prEN IEC 62541-19:2024 - "OPC Unified Architecture – Part 19: Dictionary Reference" defines an OPC UA Information Model for referencing external dictionaries (for example IEC Common Data Dictionary or ECLASS) from an OPC UA AddressSpace. The standard specifies ObjectTypes, VariableTypes and a ReferenceType that servers can use to point OPC UA Nodes to external classification and semantic entries without duplicating dictionary content. It is part of the IEC 62541 OPC UA series and links OPC UA to metadata registries and identification schemes.

Key topics

• Information Model for dictionary references: Types and conventions to represent dictionary entries and optional dictionary hierarchies inside an OPC UA Server.
• ObjectTypes: Includes abstract and concrete types such as DictionaryEntryType, IrdiDictionaryEntryType and UriDictionaryEntryType, plus DictionaryFolderType and the Dictionaries Object for optional exposure of dictionary structure.
• ReferenceType: HasDictionaryEntry is defined to link OPC UA Nodes (objects, variables, properties) to external dictionary entries as external semantic annotations.
• VariableTypes: Types such as MultiStateDictionaryEntryDiscreteBaseType and MultiStateDictionaryEntryDiscreteType are provided for representing enumerated or multi-state dictionary mappings.
• Normative interoperability: References ISO/IEC 11179-6 (metadata registries), ISO 29002-5 (identification schemes) and ISO/IEC 6523 for organization identification to ensure consistent identifiers (IRDI/URI) when linking external dictionaries.
• Design considerations: Servers may optionally expose dictionary hierarchies and content, but resource constraints (e.g., device firmware) should be considered.

Applications

• Semantic interoperability: Map device types, properties and classifications in OPC UA to standardized external taxonomies (IEC CDD, ECLASS) for consistent interpretation across systems.
• Device vendors & integrators: Attach authoritative classification identifiers to DeviceType instances and properties so asset-management, engineering and maintenance systems can discover and interpret device semantics automatically.
• System architects & automation engineers: Use dictionary references to enable cross-vendor data consistency, digital-twin enrichment and improved asset searchability.
• Software developers: Implement OPC UA Servers/Clients that consume IRDI or URI references, resolve dictionary entries and integrate with metadata registries.

Related standards

• IEC 62541 series (notably Parts 1, 3, 4, 5, 8, 100)
• ISO/IEC 11179-6 (MDR)
• ISO 29002-5 (identification scheme)
• ISO/IEC 6523 (organization identification)

Keywords: OPC UA, Dictionary Reference, IEC 62541-19, Information Model, IEC Common Data Dictionary, ECLASS, HasDictionaryEntry, IRDI, URI, metadata registry, semantic interoperability.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2026
Enotna arhitektura OPC - 19. del: Slovarska zveza (IEC 62541-19:2025)
OPC unified architecture - Part 19: Dictionary Reference (IEC 62541-19:2025)
OPC Unified Architecture - Teil 19: Wörterbuch Referenz (IEC 62541-19:2025)
Architecture unifiée OPC - Partie 19: Référence de dictionnaire (IEC 62541-19:2025)
Ta slovenski standard je istoveten z: EN IEC 62541-19:2026
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 62541-19

NORME EUROPÉENNE
EUROPÄISCHE NORM January 2026
ICS 25.040
English Version
OPC unified architecture - Part 19: Dictionary Reference
(IEC 62541-19:2025)
Architecture unifiée OPC - Partie 19: Référence de OPC Unified Architecture - Teil 19: Wörterbuch Referenz
dictionnaire (IEC 62541-19:2025)
(IEC 62541-19:2025)
This European Standard was approved by CENELEC on 2026-01-09. 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,
Türkiye 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
© 2026 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62541-19:2026 E

European foreword
The text of document 65E/1044/CDV, future edition 1 of IEC 62541-19, 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) 2027-01-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2029-01-31
document have to be withdrawn
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.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 62541-19:2025 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 61987 series NOTE Approved as EN IEC 61987 series
IEC 62541-100 NOTE Approved as EN 62541-100
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.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 62541-1 - OPC Unified Architecture - Part 1: EN IEC 62541-1 -
Overview and concepts
IEC 62541-3 - OPC Unified Architecture - Part 3: Address EN IEC 62541-3 -
Space Model
IEC 62541-5 - OPC Unified Architecture - Part 5: EN IEC 62541-5 -
Information Model
IEC 62541-8 - OPC unified architecture - Part 8: Data EN IEC 62541-8 -
access
ISO/IEC 11179-6 - Information technology - Metadata - -
registries (MDR) – Part 6: Registration
ISO 29002-5 - Information automation systems and - -
integration - Exchange of characteristic
data – Part 5: Identification scheme

Under preparation. Stage at the time of publication: prEN IEC 62541-1:2024.
Under preparation. Stage at the time of publication: prEN IEC 62541-3:2024.
Under preparation. Stage at the time of publication: prEN IEC 62541-8:2024.
IEC 62541-19 ®
Edition 1.0 2025-12
INTERNATIONAL
STANDARD
OPC unified architecture -
Part 19: Dictionary Reference
ICS 25.040  ISBN 978-2-8327-0835-4

IEC 62541-19:2025-12(en)
IEC 62541-19:2025 © IEC 2025
CONTENTS
FOREWORD . 2
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Dictionary Reference Information Model overview . 4
4.1 General . 4
4.2 Overview . 5
5 OPC UA ObjectTypes . 6
5.1 DictionaryEntryType . 6
5.2 DictionaryFolderType . 7
5.3 IRDI ISO/IEC 11179-6 conformant DictionaryEntryType . 7
5.4 URI based dictionary entry type . 9
6 HasDictionaryEntry ReferenceType . 9
7 OPC UA VariableTypes . 10
7.1 MultiStateDictionaryEntryDiscreteBaseType VariableType . 10
7.2 MultiStateDictionaryEntryDiscreteType VariableType . 11
8 OPC UA Objects . 11
8.1 Dictionaries Object . 11
9 Examples (informative) . 12
Bibliography . 15

Figure 1 – The dictionary reference types . 6
Figure 2 – IRDI overview . 8
Figure 3 – DeviceType Property example . 12
Figure 4 – Example with references to classes and properties . 13
Figure 5 – Example with two dictionaries . 14

Table 1 – DictionaryEntryType definition . 7
Table 2 – DictionaryFolderType definition . 7
Table 3 – IrdiDictionaryEntryType definition . 8
Table 4 – UriDictionaryEntryType definition . 9
Table 5 – HasDictionaryEntry ReferenceType . 10
Table 6 – MultiStateDictionaryEntryDiscreteBaseType definition . 10
Table 7 – MultiStateDictionaryEntryDiscreteType definition . 11
Table 8 – Dictionaries definition . 11

IEC 62541-19:2025 © IEC 2025
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPC unified architecture -
Part 19: Dictionary Reference
FOREWORD
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IEC 62541-19 has been prepared by subcommittee 65E: Devices and integration in enterprise
systems, of IEC technical committee 65: Industrial-process measurement, control and
automation. It is an International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
65E/1044/CDV 65E/1133/RVC
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
IEC 62541-19:2025 © IEC 2025
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
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Italics are also used to denote the name of a service input or output parameter or the name of
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The italicized terms and names are also often written in camel-case (the practice of writing
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AddressSpace instead of Address Space. This makes it easier to understand that there is a
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IEC 62541-19:2025 © IEC 2025
1 Scope
This part of IEC 62541, which is a specification, defi
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