In control systems,another common term is analog and switch.Regardless of input or output,a parameter is either analog or digital.The analog quantity refers to the size of the control system quantity is a continuous value that changes within a certain range,such as temperature,from 0-100 degrees,pressure from 0-10MPA,liquid level from 1-5 meters,and electric valve opening from 0-100%,etc.These quantities are analog quantities.The switch quantity means that the physical quantity has only two states,such as the on and off state of the switch,the closing and opening of the relay,the on and off of the solenoid valve and so on.
在控制系统中,另一个常见的术语就是模拟量和开关量。不论输入还是输出,一个参数要么是模拟量,要么是开关量。模拟量指控制系统量的大小是一个在一定范围内变化的连续数值,比如温度,从0-100度,压力从0-10MPA,液位从1-5米,电动阀门的开度从0-100%,等等,这些量都是模拟量。而开关量指该物理量只有两种状态,如开关的导通和断开的状态,继电器的闭合和打开,电磁阀的通和断等等。
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