描述
只是随着系统规模的大小和被控对象的差别有一些区别。
要把现场信号读进控制系统,首先把传感器的信号线接到端子。如果传感器不是一个,它的信号线多了,并需要作一些信号预处理,这时就要端子板。模拟信号要转换成数字信号,要模拟输入板。经运算后输出,要把数字信号转换成模拟信号,需要输出板,然后到端子板。后将信号送到执行器(如阀门)。
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