Override the time stamp for analysis outputs

Use the Advanced options window in an analysis to specify the time stamp of analysis output values.

1. In the Elements browser, select an element, and in the viewer, click the Analyses tab.

2. From the list of analyses, select an analysis, and then click Advanced in the scheduling area near the bottom of the window.

3. In the Advanced options window, specify the output time stamp override:

   • Trigger Time

     Default value. The clock time that a schedule specifies or that an input value changes.

   • Execution Time

     The clock time at which the analysis calculates the value. This differs from the trigger time when the system has a lag time or when there is a configured calculation wait time (see CalculationWaitTimeInSeconds in Understand PI Analysis Service settings).

   • Relative to Trigger Time

     A time specified by a PI time expression. Enter a valid time expression, such as a time relative to the trigger time or a fixed time. In the expression, the current time and implied reference time is the trigger time (that is, the clock time that the schedule specifies or that an input value changes). If you enter a fixed time, all output values from the analysis will have the entered time stamp. When not specified, the default unit of measure for relative time is hours.

     For information on viewing trend charts for output times that are specified relative to trigger times, see Learn about trend charts and Preview Results.

   • Variable

     Use the value of a variable as an output timestamp. Variable must be a timestamp of value type DateTime or, a String that can be parsed as DateTime. If this value is calculated from an expression, PI Analysis Service uses the calculated value for each trigger events as the output timestamp. This option is only available for expression analyses.

     You can preview your results by right-clicking the analysis and selecting Preview Results. For more information, see Learn about trend charts and Preview Results.