根据系统的控制要求,确定系统所需的全部输入设备(如:按纽、位置开关、转换开关及各种传感器等)和输出设备(如:接触器、电磁阀、信号指示灯及其它执行器等),从而确定与PLC有关的输入/输出设备,以确定PLC的I/O点数。Seal, Pump Chicago Rawh, 80-7455

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