The 8hAverage algorithm produces an average value based on the good quality raw historic values reported for an 8 hour period. The timestamp for each processed historic value produced by the 8hAverage algorithm is at the start of the resample interval.
Example:
The following Trend shows a point’s raw historic values for the period 14:00 on 29 August to 14:00 on 30 August.
By applying the 8hAverage algorithm to these raw historic values, ClearSCADA can create the following processed historic trace for the same time period. The resample interval of the trace is configured to be 30M, which means that ClearSCADA plots the processed historic values in 30 minute intervals (samples) on the X-Axis.
So in this example, the average 8 hourly value at 02:00 on August 29 is calculated using each of the raw historic values for the period August 28 18:00 to August 29 02:00. For the average 8 hourly value at August 29 04:00, the raw historic values for the period August 28 20:00 to August 29 04:00 are used in the calculation, and so on.
To provide the result of the 8hAverage algorithm, ClearSCADA adds up each of the raw historic values in the 8 hour period starting at the beginning of the resample interval.The result is plotted on the Trend at the time that corresponds to the start of the resample interval.
Further Information