9 Standard EventTypes ToC Previous Next

9.32 ModelChangeEvents ToC Previous Next

9.32.4 Event compression ToC Previous Next

An implementation is not required to issue an Event for every update as it occurs. An OPC UA Server may be capable of grouping a series of transactions or simple updates into a larger unit. This series may constitute a logical grouping or a temporal grouping of changes. A single ModelChangeEvent may be issued after the last change of the series, to cover all of the changes. This is referred to as Event compression. A change in the NodeVersion and the ViewVersion may thus reflect a group of changes and not a single change.

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