IEC 62541-5 Ed. 4.0 b:2026

Current Revision
OPC Unified architecture - Part 5: Information Model

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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.

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