The basic PLC components must be flexible and configurable enough to meet the needs of different plants and applications.Input stimuli,whether analog or digital,come from machine devices,sensors,or process events,expressed as voltages or currents.The PLC must accurately parse and convert the stimulus signals for the CPU,which in turn determines a set of commands to send to the output system,which controls the actuators installed in a factory or another industrial environment.
基本的PLC组件必须足够灵活并可配置,以满足不同工厂和应用的需求。输入激励(无论是模拟还是数字信号)来自机器装置、传感器或过程事件,表现为电压或电流。PLC必须准确地为CPU提供解析并转换激励信号,CPU进而确定一组发给输出系统的指令,而后者控制着安装在工厂或另一工业环境的执行机构。
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