IEC 62541-5.2020 defines the Information Model of the OPC Unified Architecture. The Information Model describes standardised Nodes of a Server’s AddressSpace. These Nodes are standardised types as well as standardised instances used for diagnostics or as entry points to server-specific Nodes. This second edition cancels and replaces the first edition published in 2011 and constitutes a technical revision. This edition includes the following changes:
– Defined ProgressEventType;
– Defined DataType called BitFieldMaskDataType;
– Delete Property SamplingRateCount in ServerDiagnosticSummaryDataType;
– Added the Property “EffectiveTransitionTime” to TransitionVariableType;
– Introduced VariableType OptionSetType;
– Added a new EventType called SystemStatusChangeEventType;
– Added properties to ServerCapabilitiesType. Added an object for operation limits. Added type OperationLimitsType containing that information;
– Added SecureChannelId to AuditActivateSessionEventType;
– Added normative Annex C defining FileType and Methods;
– Added a Method GetMonitoredItems on ServerType;
– Removed the concept of ModelParent. Added meta data for namespaces in ServerType and created types for managing that. Added representations for ModellingRules OptionalPlaceholder and MandatoryPlaceholder;
– Added new types NonTransparentNetworkRedundancyType, NetworkGroupDataType and EndpointUrlListDataType.

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