Change the time range for a display

The timebar governs the time range for all symbols in a display. Use any of the following methods to change the time range:

• In the timebar control, click the duration button to view the duration menu . This action resets the start time to accommodate the duration you select. The durations available are set by the site administrator.

  Note: Keep in mind that some time durations are variable. For example, if the duration is 1 month(s), the number of days shown on the display will vary depending on the current month. If it is April, the 1 month(s) duration converts to 30 days; however, if it is May, the 1 month(s) duration converts to 31 days.

• Click the arrows to shift the display range forward or backward in time in increments of the display range.

• In the timebar control, click the start or end time . An editable field appears that allows you to enter a new start time or end time to edit the time value. If the end time is set to an absolute time, or any time other than current time, the display will not update. For more information, see Use PI time.

• In the timebar control, click the Now button . Once set, the Now button and display range remain highlighted and your symbols dynamically update.

Single Value Symbols

While symbols that show multiple values (e.g., Trend or Time Series Table) simply provide data covering the full time range that you specify in the timebar, the way that symbols showing only a single value (e.g., Value or Gauge) work in conjunction with the timebar is not as straight forward. If you specify a time range in the past, single value symbols provide the last value that was collected at the end of the time range by default. However, that behavior can vary if you customized any AF attribute value retrieval methods. Additionally, for single value symbols:

• If the start time is in the past and the end time is in the future, PI Vision uses the current time to retrieve data.

• If both the start time and end time are in the future, PI Vision uses the start time to retrieve data.

  Note: To check when the value on a symbol was collected, you can hover over the value to show its timestamp (you need to have tooltips enabled).

Future Data

Your PI Points may or may not provide future data, depending on how they are set up. Any future data that PI Vision displays is taken from the PI Data Archive and typically originates from predictive analytics systems. PI Vision itself does not ever create estimated future data. Wherever future data exists in PI Vision, the origin source is external to PI Vision and that data flows into PI Vision like your other data. If a PI Point is not set up to provide future data to PI Vision, then PI Vision does not display any future data for that PI Point.