Topic:
digital simulation of analog
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Summary
The standard control loop for process control is called PID. This consists of a proportional component relating an output signal to an input signal, an integral component for modifying the base line set point, and a derivative component which increases the rate of change according to the error size. The control loop may contain a deadband to prevent hunting when the error is small. (cbb 5/80)
Subtopic: proportional control 
| Quote: in proportional control, the change in output is proportional to the error (measurement-setpoint) [»fishJ10_1978]
| | Quote: a controller may include a deadband which prevents changes for small errors [»fishJ10_1978]
| | Quote: in most process plants, 80% of loops use simple PI analog controllers; most of these are never adjusted after tuning [»instrumentcontrol]
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Subtopic: PID loop
| Quote: in a PID loop, the integral (reset) changes the base level of the output when a setpoint or load changes [»fishJ10_1978]
| Quote: in a PID control loop, the derivative (rate/pre-act) is the rate of change of output due to the rate of change of error
[»fishJ10_1978]
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Related Topics
Topic: digital simulation of analog
(8 items)
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