描述
旋转编码器是一种光电式旋转测量装置，它将被测的角位移直接转换成数字信号（高速脉冲信号）。因些可将旋转编码器的输出脉冲信号直接输入给PLC，利用PLC的高速计数器对其脉冲信号进行计数，以获得测量结果。不同型号的旋转编码器，其输出脉冲的相数也不同，有的旋转编码器输出A、B、Z三相脉冲，有的只有A、B相两相，最简单的只有A相。
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