2-bit control
This is the simplest form of feedback control,sometimes called switch control.This control is to give a switch signal when the measurand reaches the highest or lowest value.Although the measured value may be an analog quantity,the control output is switched,so it is called two-position control.In industrial sites,there are many thermostats and liquid level switch controls in this way.
二位控制
这是最简单的反馈控制,有时也叫开关控制。这种控制是当被测量达到最高值或最低值的时候,就给出一个开关的信号。虽然被测量可能是模拟量,但控制输出是开关的,所以叫两位控制。在工业现场,有许多温控器和液位开关控制是采用这种方式的。
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