Description
PLC数字输入模块为了防止外界线路产生的干扰(如尖峰电压,干扰噪声等)引起PLC的非正常工作甚至是元器件的损坏,一般在PLC的输入侧都采用光耦,来切断PLC内部线路和外部线路电气上的联系,保证PLC的正常工作。并且在输入线路中都设有RC滤波电路,
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