ExcMax ExcMin and ExcDev (exception processing)

Exception reporting enables you to capture the minimum amount of data required to meaningfully represent a trend. The following parameters configure exception reporting in the PI interface.

• ExcMax: The maximum time period allowed between sending values to the Data Archive.

• ExcMin: The minimum time period between values sent to the Data Archive.

• ExcDev: The minimum change from the last value sent to the Data Archive required for the interface to send a new value.

Exception processing is not performed for queries that include PI annotations: all data retrieved by such queries is archived.

To further filter the amount of data that is captured, you can configure a tag's compression settings so that only meaningful deviations are archived. For more information about exception processing and compression, see the PI Universal Interface (UniInt) Framework User Guide.