11... APPENDIX A: MASTER ICON FILE REFERENCE
DELTA FUNCTION ICON
FUNCTION:
The Delta icon provides a special data processing function that can be used in a Program Net to drastically reduce the number of data samples required to profile an analog signal. The Delta icon only passes data from input to output when the input signal differs from the last passed sample by more than a User defined amount, ie the `delta’ value.
When logging data that has periods of relatively stable values mixed with occassional dynamic fluctuations, the Delta icon can reduce the amount of data samples required to profile the curve with a minimum of accuracy compromise.
The data plotted above demonstrates the reduction of data points that is possible with the Delta icon. The Program Net shown below was developed with a Delta icon programmed with a Delta value of 1 degree F. Temperature data was then collected over a few seconds while the temperature sensor was warmed and then allowed to cool. As can be seen, the curve profiles do reflect slight differences (1 degree F maximum deviation), however the number of data samples used is radically reduced with the Delta icon data. (Note that the curves are displayed with the same temperature scaling but are merely offset for viewing.)
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