The PID algorithm, as implemented in a typical digital control system, can be understood by reference to a small basic program that is the equivalent to the PID algorithm in its most common application. Further explaination of the PID algorithm 1. A positive feedback integral algorithm is used.
Derivative is on process.
Input after derivative calculation and filter Feedback internal feedback for reset after filter Derivative Derivative time in minutes Gain Gain, negative if controller is reverse acting ResetRate Reset Rate in repeats per minute DFilter Derivative filter time constants, in minutes. Provided by John Shaw .