描述
CPU模块的工作电压一般是5V,而PLC的输入/输出信号电压一般较高,如直流24V和交流220V。从外部引入的尖峰电压和干扰噪声可能损坏CPU模块中的元器件,或使PLC不能正常工作。在I/O模块中,用光耦合器、光电晶闸管、小型继电器等器件来隔离PLC的内部电路和外部的I/O电路,I/O模块除了传递信号外,还有电平转换与隔离的作用。
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