描述
为实现液位的手动/自动控制，需要输入口12点，输出口8点，选用C20P 20点I/O单元的PLC，输入光电隔离，输出继电器隔离，负载能力强；液位检测采用干簧管传感器，手动/自动转换、运行/试验转换和液位设定采用双位旋钮，手动启泵、停泵和确认、试验采用常开按钮；输出选用电子音响报警器和24V直流指示灯、继电器
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