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）。
编码器如以信号原理来分，有增量型编码器，X型编码器。
我们通常用的是增量型编码器，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，X简单的只有A相。
编码器有5条引线，其中3条是脉冲输出线，1条是COM端线，1条是电源线（OC门输出型）。编码器的电源可以是外接电源，也可直接使用PLC的DC24V电源。电源“-”端要与编码器的COM端连接，“+ ”与编码器的电源端连接。编码器的COM端与PLC输入COM端连接，A、B、Z两相脉冲输出线直接与PLC的输入端连接，A、B为相差90度的脉冲，Z相信号在编码器旋转一圈只有一个脉冲，通常用来做零点的依据，连接时要注意PLC输入的响应时间。旋转编码器还有一条屏蔽线，使用时要将屏蔽线接地，提高抗干扰性。
编码器-----------PLC
A-----------------X0
B-----------------X1
Z------------------X2
+24V------------+24V
COM------------- -24V-----------COM
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NOC-SP50-2MHT
NOC-SP60-2MHT
NOC-SP100-2MHT
NOC-SP200-2MHT
NOC-SP250-2MHT
NOC-SP300-2MHT
NOC-SP360-2MHT
NOC-SP500-2MHT
NOC-SP600-2MHT
NOC-SP1000-2MHT
NOC-SP1024-2MHT
NOC-SP1250-2MHT
NOC-SP1800-2MHT
NOC-SP2000-2MHT
NOC-SP2048-2MHT
NOC-SP2500-2MHT
NOC-SP3600-2MHT
NOC-SP4096-2MHT
NOC-SP5000-2MHT
NOC-SP10000-2MHT
NOC-SP10-2MD
NOC-SP20-2MD
NOC-SP30-2MD
NOC-SP40-2MD
NOC-SP50-2MD
NOC-SP60-2MD
NOC-SP100-2MD
NOC-SP200-2MD
NOC-SP250-2MD
NOC-SP300-2MD
NOC-SP360-2MD
NOC-SP500-2MD
NOC-SP600-2MD
NOC-SP1000-2MD
NOC-SP1024-2MD
NOC-SP1250-2MD
NOC-SP1800-2MD
NOC-SP2000-2MD
NOC-SP2048-2MD
NOC-SP2500-2MD
NOC-SP3600-2MD
NOC-SP4096-2MD
NOC-SP5000-2MD
NOC-SP10000-2MD
