Historical summary period

An Industrial graphic custom property can show historical statistics from Historian data over a defined summary period. During design time, you must specify the summary period to collect Historian summary data by entering values for the Duration and StartTime options shown on the Edit Custom Properties dialog box.

These assigned values are passed as input parameters of the new custom property. A value in minutes must be assigned to the Duration option.

The StartTime option can be left blank. Auto refresh is applied if a StartTime value is not specified.

• If a start time is not specified, then the start and end times of the summary period are calculated as:

  Start Time = Current Time - Duration

  End Time = Current Time

• If a start time is specified, then the start and end times of the summary period are calculated as:

  Start Time = StartTime option value

  End Time = StartTime + Duration

The Duration option can accept a negative number when a start time is specified. When Duration is assigned a negative number, the start time input parameter value becomes the end time of the summary period. The start time is calculated using the formula shown below:

End Time = StartTime assigned option value

Start Time = End Time + Duration (in this case it is negative value)

Duration can accept values from 1 minute to 10080 minutes, which is one week. StartTime must be within datetime Min and Max Value. During runtime, history summary data is auto refreshed at an interval that is 25 percent of its duration length when a StartTime value is not specified.