Archive attributes

To specify how PI point data is stored in the Data Archive server, click on the Archive tab and enter values.

Typical value — Enter a reasonable sample value for the point. For a numeric tag, a typical value must be greater than or equal to the Zero, and less than or equal to the Zero plus the Span.

Zero — Enter the lowest possible value for the point, as the bottom of the range used for scaling float16 values and trends. Recorded values lower than the Zero value are recorded in the Data Archive server with the digital state Under Range.

A Zero value is required for numeric data type points, but not for non-numeric points. The instrument zero is a logical zero value, and certain interfaces require that Zero and Span values match the instrument system range. See your interface documentation for details.

Span — Enter the maximum difference between the top and bottom of the point range, as a positive value. The Span value is used for scaling float16 values and trends and is required only for numeric data type points. Recorded values above the sum of the zero and Span values are recorded in Data Archive server with the digital state Over Range.

Scan — Enable Scan if an interface that supplies data to the point requires a scan flag. Interfaces that require a scan flag do not update points when the flag is disabled. See your interface documentation for Scan attribute requirements.

Archiving — Enable Archiving to store point values in the Data Archive server.