Summation 
MATHDR32 > Driverspecific functions > Formulas > Float formula > Data reduction > Summation 
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The data reduction Summation
allows to calculate the sum
of a variable.
Possible summations are:
Further parameters in the configuration are:
Press the button OK
to open a dialog where you can enter
the parameters for calculating the sum:
Variable
Display of the event variable
Interval
duration
Parameters 
Description 

Timelimited 
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 (realtime 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 recalculated. 
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 
Event triggered 
Source value is used for the calculation when a change of edge occurs in the configured binary event variable. 
Button

Active if projecting was set to eventcontrolled. Selection of the binary event variable. 
Edge 
Active if projecting was set to eventcontrolled. Determination of the respective edge change for the acceptance of the source value (rising, falling). 