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IEC 62541-3:2025 (EN-FR)

OPC Unified Architecture - Part 3: Address Space Model

Standard Details

IEC 62541-3: 2025 describes the OPC Unified Architecture (OPC UA) AddressSpace and its Objects. This specification is the OPC UA meta model on which OPC UA information models are based. This fourth edition cancels and replaces the third edition published in 2020. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) addition of the concept and modelling elements for Interfaces and AddIns;
b) addition of Currency;
c) addition of Method Meta Data to define additional attributes for Method Arguments;
d) addition of ApplyRestrictionToBrowse bit to AccessRestrictionType;
e) addition of a Non-Volatile Storage bit to AccessLevelExType;
f) addition of a Constant bit and ConfigurationConstant bit to AccessLevelExType;
g) the View NodeClass has been changed to define the EventNotifier as an EventNotifierType in the same way the Object NodeClass defines it;
h) correctition of HasNotifier, HasEventSource, and Organizes, to include ObjectType as valid source node;
i) NamingRules have become deprecated;
j) addition of AssociatedWith ReferenceType.

General Information

Status : ACTIVE
Standard Type: Main
Document No: IEC 62541-3:2025 (EN-FR)
Document Year: 2025
Pages: 285
Edition: 4.0
  • Section Volume:
  • TC 65.SC 65E Devices and integration in enterprise systems

Life Cycle

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IEC 62541-3:2025 (EN-FR)
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