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

Calculation Methods

​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 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.

Maximum calculation method, schematic

Maximum calculation method, schematic

Important 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.

Minimum calculation method, schematic

Minimum calculation method, schematic

Important 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.

Average calculation method, schematic

Average calculation method, schematic

Important 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.

Sum calculation method, schematic

Sum calculation method, schematic

Delta

The change to the previous value is calculated and presented.

Delta calculation method, schematic

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.

Delta over period calculation method, schematic

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.

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