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(一)选择器选择器分为高值选择器和低值选择器,虽然结构简单,但用途很广,尤其是在组成安全保护控制系统方面,选择器具有特殊的作用。高值选择器是从两个信号中选择信号较高的那个信号作为它的输出信号;低值选择器是从两个信号中选择信号较低的那个信号作为它的输出信号。高值或低值选择器有
(A) selector Selector is divided into high value selector and low value selector, although the structure is simple, but a wide range of uses, especially in the composition of safety control system, the selector has a special role. The high-value selector selects the higher of the two signals as its output signal, and the low-value selector selects the lower one of the two signals as its output signal. High or low value selector has