IEC 62541-5 Ed. 4.0 b:2026

OPC Unified architecture - Part 5: Information Model

IEC 62541-5:2026 This edition includes the following significant technical changes with respect to the previous edition:
 a) Annex B has been removed and used to create IEC 62451-16;
 b) Annex C has been removed and used to create IEC 62451-20;
 c) currency information model has been added;
 d) information model for Interfaces and AddIns has been added;
 e) information model for Method Metadata has been added;
 f) MaxSessions, MaxSubscriptions, and MaxMonitoredItems have been added to capabilities;
 g) information model for ordered list of objects has been added;
 h) PortableQualifiedName and PortableNodeId DataTypes have been added;
 i) UriString DataType has been added;
 j) SemanticVersionString DataType has been added;
 k) AssociatedWith Reference Type has been added;
 l) ConfigurationVersion Property has been added to NamespaceMetadataType;
 m) AuditClientEventType and AuditClientUpdateMethodResultEventType have been added;
 n) ModelVersion has been added to NamespaceMetadataType;
 o) NoTransparentBackupRedundancyType has been added to support a Primary/Standby use case;
 p) BitFieldType and BitFieldDefinitionType have been added.
 This fourth edition cancels and replaces the third edition published in 2020. This edition constitutes a technical revision.