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Concept

Concept


Products: Automation Server, AS-B, Enterprise Server, AS-P, WorkStation, Virtual Project Servers
Functionalities: Trends
Product version: 1.9
4/12/2017

Calculation Methods

arrow1_rotationNone arrow1_rotationMaximum arrow1_rotationMinimum arrow1_rotationAverage arrow1_rotationSum arrow1_rotationDelta arrow1_rotationDelta over Period arrow1_rotationMeter Consumption arrow1_rotationPeriod Timestamps in Trend Charts and Trend Log Lists

​Use a calculation method to process the records of the trend log before presenting them in a trend log list or a trend chart. The original records in the trend log are not affected by the calculation method. The calculation method is applied to the trend log records grouped by a specific time interval.

The following calculation methods are available:

  • None

  • Maximum

  • Minimum

  • Average

  • Sum

  • Delta

  • Delta over period

  • Meter consumption

Note:

  • Adapt the period so it contains the required amount of records to generate a correct calculation.

  • If a calculation method is connected to an interval trend log with delta, make sure that the period and delta are adapted for the calculation.

None

No calculation is performed. The actual values are presented.

Maximum

The maximum value of each period is presented.

 
action_zoom_plus_stroke Maximum calculation method, schematic
Figure: Maximum calculation method, schematic
Important:

If the log point is offline or no value is produced during the interval, no value is displayed.

Minimum

The minimum value of each period is presented.

 
action_zoom_plus_stroke Minimum calculation method, schematic
Figure: Minimum calculation method, schematic
Important:

If the log point is offline or no value is produced during the interval, no value is displayed.

Average

The average of the values in each period is calculated and presented.

 
action_zoom_plus_stroke Average calculation method, schematic
Figure: Average calculation method, schematic
Important:

If the log point is offline or no value is produced during the interval, no value is displayed.

Sum

The sum of the values in each period is calculated and presented.

 
action_zoom_plus_stroke Sum calculation method, schematic
Figure: Sum calculation method, schematic

Delta

The change to the previous value is calculated and presented.

 
action_zoom_plus_stroke Delta calculation method, schematic
Figure: Delta calculation method, schematic

Delta over Period

The change over a period is calculated and presented. The value at the period limit is often interpolated, based upon the last value in the old period and the first value in the new period.

 
action_zoom_plus_stroke Delta over period calculation method, schematic
Figure: Delta over period calculation method, schematic

Meter Consumption

Meter consumption is a delta over period calculation with meter functionality. For more information, see Meter Trend Logs .

Period Timestamps in Trend Charts and Trend Log Lists

When a calculated value for a period is presented, the middle of the period is used as the timestamp.

Example:

The calculated value for the period 8:00-9:00 is stamped 8:30. If there is a value at 9:01, the next period is 9:00-10:00, which is stamped as 9:30. The full period may not have passed yet, but the value can be presented even if parts of the period are in the future.

See Also

  • Trend Log Lists
  • Trend Charts
  • Trends Overview
  • Attaching a Calculation Method to a Trend Log List
  • Attaching a Calculation Method to a Trend Chart Series
  • Trend Chart Settings Dialog Box – Calculation Tab
  • Meter Trend Logs