National Instruments 371685C-01 用户手册

© National Instruments Corporation

algorithm

A prescribed set of well-defined rules or processes for the solution of a 
problem in a finite number of steps.

autotuning

Automatically testing a process under control to determine the controller 
gains that will provide the best controller performance.

Autotuning Wizard

An automated graphical user interface provided in the Autotuning 
functions. The Autotuning Wizard gathers some information about the 
desired control from the user and then steps through the PID autotuning 
process. You must specify to use wizard-based autotuning in 

PidCreateWithAutotune

 to use this feature.

bias

The offset added to a controller’s output.

bumpless transfer

A process in which the next output always increments from the current 
output, regardless of the current controller output value. Therefore, transfer 
from automatic to manual control is always bumpless.

cascade control

Control in which the output of one controller is the setpoint for another 
controller.

closed loop

A signal path that includes a forward path, a feedback path, and a summing 
point and that forms a closed circuit. Also called a feedback loop.

controller

Hardware and/or software used to maintain parameters of a physical 
process at desired values.

controller output

A quantity or condition that is varied as a function of the actuating error 
signal so as to change the value of the directly controlled variable.

cycle time

The time between samples in a discrete digital control system.