描述
CPU模块主要由微处理器(CPU芯片)和存储器组成。在PLC控制系统中厂CPU模块相当于人的大脑，它不断地采集输入信号，执行用户程序，刷新系统的输出；存储器用来储存程序和数据。输入(1nput)模块和输出(Output)模块简称为I／O模块，它们是系统的眼、耳、手、脚，是联系外部现场设备和CPU模块的桥梁。输入模块用来接收和采集输入信号，开关量输入模块用来接收从按钮；选择开关、数字拨码开关、限位开关、接近开关、光电开关、压力继电器等过来的开关量输入信号；模拟量输入模块用来接收电位器、测速发电机和各种变送器提供的连续变化的模拟量电流、电压信号。
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