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A feedback control system in which the control signal is a discontinuous function of the sensed error and may therefore assume one of a limited number of discrete values.



Related Terms

LOOP GAIN

  1. The ratio of the magnitude of the primary feedback signal in a feedback control system to the magnitude of the actuating signal. 2. Total usable power gain of a carrier terminal or two-wire repeater; maximum usable gain is determined by, and may not exceed, the losses in the closed path.

COMPUTER-CONTROLLED SYSTEM

A feedback control system in which a computer operates on both the input signal and the feedback signal to effect control.

NONLINEAR FEEDBACK CONTROL SYSTEM

Feedback control system in which the relationships between the pertinent measures of the system input and output signals cannot be adequately described by linear means.

DISCRETE SYSTEM

A control system in which signals at one or more points may change only at discrete values of time. Also known as discrete-time system.

FEEDBACK COMPENSATION

Improvement of the response of a feedback control system by placing a compensator in the feedback path, in contrast to cascade compensation. Also known as parallel compensation.

PHOTOELECTRICLOOPCONTROL

[CONTSYS] Aphotoelectric control system used as a position regulator for a loop of material passing from one stripprocessing line to another that may travel at a different speed. Also known as loop control.

MINOR LOOP

A portion of a feedback control system that consists of a continuous network containing both forward elements and feedback elements.

CONTROL-SYSTEM FEEDBACK

A signal obtained by comparing the output of a control system with the input, which is used to diminish the difference between them.

DEAD TIME

  1. The time interval between a change in the input signal to a process control system and the response to the signal.
  2. The time interval, after a response to one signal or event, during which a system is unable to respond to another. Also known as insensitive time.

INTEGRAL-MODE CONTROLLER

A controller which produces a control signal proportional to the integral of the error signal.

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