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Tag changes at the Edge are published each time the Qualified Value (Value, Timestamp and Quality) changes.

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Note

Deadband Style must be set to Discrete for all tag datatypes. This ensures that a change is registered any time the value moves +/- the specified amount from the last stored value.

If left at the default Auto setting, Ignition will determine the deadband style based on the tag datatype. See this Ignition Configuring Tag History Deadband and Analog Compression for details on how the Analog and Discrete Deadband Styles differ. 

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When you identify missing tag change events in the published data, you can then query the History Storage Provider to see if these values exist in the database.

If these data points do not exist in the database, it means that tag change events are not firing.