For the control system,since the CPU is binary,each bit of the data has two states of”0″and”1″.Therefore,the switching value can be represented by only one bit inside the CPU,for example,”0″.On,use”1″to indicate off.The analog quantity is based on the precision,usually 8 to 16 bits are needed to represent an analog quantity.The most common analog quantity is 12 bits,that is,the precision is 2-12,and the highest precision is about 2.5/10,000.Of course,in the actual control system,the accuracy of the analog quantity is also limited by the accuracy of the analog/digital converter and the instrument,and it is usually impossible to reach such a high level
对控制系统来说,由于CPU是二进制的,数据的每位有“0”和“1”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“0”表示开,用“1”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。最常见的模拟量是12位的,即精度为2-12,最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。
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