National-instruments PID Control Toolkit 371685C-01 Manual de usuario descargar pdf (Pagina 36)

Glossary

ramp The total (transient plus steady-state) time response resulting from a sudden

increase in the rate of change from zero to some finite value of input

stimulus.

reentrant execution Mode in which calls to multiple instances of a function can execute in

parallel with distinct and separate data storage.

s Seconds.

setpoint (SP) An input variable that sets the desired value of the controlled process

variable.

span The algebraic difference between the upper and lower range values.

time constant (T) In process instrumentation, the value T (in minutes) in an exponential

response term, A exp (–t/T), or in one of the transform factors, such as

1+sT.

trapezoidal integration A numerical integration in which the current value and the previous value

are used to calculate the addition of the current value to the integral value.

V Volts.

windup area The time during which the controller output is saturated at the maximum or

minimum value. The integral action of a simple PID controller continues to

increase (wind up) while the controller is in the windup area.

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National-instruments PID Control Toolkit 371685C-01 Manual de usuario Pagina 36