IEC 62541-3:2020 ED3

OPC Unified Architecture - Part 3: Address Space Model IEC 62541-3:2020 ED3

Publication date:   Jul 8, 2020

General information

60.60 Standard published   Jul 8, 2020


TC 65/SC 65E

International Standard

25.040.40   Industrial process measurement and control | 35.100.05   Multilayer applications



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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.

Life cycle


IEC 62541-3:2015 ED2


IEC 62541-3:2020 ED3
60.60 Standard published
Jul 8, 2020


IEC 62541-3 ED4