那么电动阀门中开关量和模拟量有什么区别呢？
So what is the difference between switching value and analog value in electric valve?
1，开关量：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。是指非连续性信号的采集和输出，包括遥信采集和遥控输出。它有1和0两种状态
1. Switching value: the physical quantity has only two states, such as on and off of the switch, on and off of the relay, on and off of the solenoid valve, etc. It refers to the acquisition and output of discontinuous signals, including remote signal acquisition and remote control output. It has two states: 1 and 0
2，模拟量：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。指变量在一定范围连续变化的量；也就是在一定范围(定义域)内可以取任意值(在值域内)。
2. Analog quantity: the control system quantity is a continuous value varying within a certain range. For example, the temperature is from 0 to 100 degrees, the pressure is from 0 to 10MPa, the liquid level is from 1 to 5m, the opening of electric valve is from 0 to 100%, etc. these quantities are analog quantities. It refers to the quantity that the variable changes continuously in a certain range; That is, any value (within the value range) can be taken within a certain range (definition range).
对控制系统来说，由于CPU是二进制的，数据的每位只有和两种状态，因此，开关量只要用CPU内部的一位即可表示，比如，用表示开，用表示关。而模拟量则根据精度，通常需要8位到16为才能表示一个模拟量。常见的模拟量是12位的，即精度为2－12，高精度约为万分之二点五。当然，在实际的控制系统中，模拟量的精度还要受模拟／数字转换器和仪表的精度限制，通常不可能达到这么高。
For the control system, since the CPU is binary and each data has only one and two states, the switching value can be represented by one bit inside the CPU, for example, on and off. The analog quantity usually needs 8 to 16 bits to represent an analog quantity according to the accuracy. The common analog quantity is 12 bits, that is, the accuracy is 2-12, and the high accuracy is about 2.5 per 10000. Of course, in the actual control system, the accuracy of analog quantity is also limited by the accuracy of analog / digital converter and instrument, which is usually impossible to reach such a high level.
开关量仅有两种相反的工作状态，例如高电平和低电平，继电器线圈的通电和断电，触电的接通和断开，PLC可以直接输入和输出开关量信号。有的PLC将开关量称为数字量。
There are only two opposite working states of switching value, such as high level and low level, power on and power off of relay coil, power on and power off of electric shock. PLC can directly input and output switching value signals. Some PLCs call switching value digital value.
模拟量是连续变化的物理量，例如电压，温度，压力和转速等PLC，不能直接处理模拟量，需要用模拟量输入模块中的A／D转换器，将模拟量转换为与输入信号成正比的数字量。PLC中的数字量（例如PID控制器的输出）需要用模拟量输出模块中的D／A转换器将它们转换为与相应数字成比例电压或电流，供外部执行机构（例如电动调节阀或变频器）使用。
Analog quantity is a continuously changing physical quantity, such as voltage, temperature, pressure and speed. PLC can not directly process analog quantity. It needs to use the A / D converter in the analog input module to convert analog quantity into digital quantity proportional to the input signal. The digital quantities in PLC (such as the output of PID controller) need to be converted into voltage or current proportional to the corresponding digital by D / a converter in analog output module for use by external actuator (such as electric control valve or frequency converter).
开关量不是通电，就是断电，或称为0和1，0代表通电，1代表断电。例如，按钮，开关，时间继电器，过电流压力继电器，这类属于输入，输出的有接触器，继电器，电磁阀等。模拟量是一种连续变化的量，例如，输入的有：传感器，（好多种）输出的有：伺服电动机，电磁阀，距离，速度等控制信号。换句说法说：开关量是真实物体，而模拟量是一个虚拟物体，比如在电脑上画画等。
The switching value is either energized or de energized, or called 0 and 1. 0 represents energized and 1 represents de energized. For example, buttons, switches, time relays, overcurrent and pressure relays belong to input and output contactors, relays, solenoid valves, etc. Analog quantity is a continuously changing quantity. For example, the input includes sensors, and the output includes servo motor, solenoid valve, distance, speed and other control signals. In other words, the switching value is a real object, while the analog value is a virtual object, such as drawing on a computer.
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