Time average

The data reduction Time average allows the calculation of the average of a variable. The possible average calculations are:

Time interval:
Summation over time interval (seconds, minutes, hours, days)
Event interval:
The average is calculated when a change in an event variable occurs

Further parameters in the configuration are:

Output: The result is provided at the end of the interval or continuously
Initialization: The value is initialized at the beginning of the interval (existing or new value)
Type of calculation: The formation of mean value can be defined (sum, integral over time)
Scanning type: Type of scanning of the source Variable (spontaneous, after update parameterization, event-controlled)

Press the button OK to open a dialog where you can enter the parameters for calculating the average:

Variable
Display of the event variable

Interval duration

Parameters	Description
Time-limited	Calculation of average over time.
Event triggered	Average is calculated when an event variable changes.
Time	Entry of the numeric value for the corresponding time (real-time synchronous, i.e. entry 15 means 15, 30, 45, 0 etc.).
Seconds, minutes, hours, days	Selection of the time interval.
Offset	Delay for start and end of the average calculation.

Output of the result

Parameters	Description
At the end of the interval	The value is only provided at the end of the interval; until then, only the previous value is available.
continuous	The value is updated during each scan of the source variable.

Initialization at the start of the interval

Parameters	Description
With existing value	Value is based on previous value.
with new value	Value must be re-calculated.

Calculate as

Parameters	Description
Simple sum	Addition of the values.
Integral over time	Integration of the values over the time interval

Scan the source variable

Parameters	Description
For each new value	on change changes of the source variable are immediately considered for the calculation
According to scanning rate	The source values are only used in the defined update rate for the calculation (button `Update is fixed to 0,5 sec.`).
Event triggered	Source value is used for the calculation when a change of edge occurs in the configured binary event variable.
Button `...` for event variable	Active if projecting was set to event-controlled. Selection of the binary event variable.
Edge	Active if projecting was set to event-controlled. Determination of the respective edge change for the acceptance of the source value (rising, falling).