描述
二进制数的1位(bit)只有0和1两种不同的取值,可用来表示开关量(或称数字量)的两种不同的状态,如触点的断开和接通,线圈的通电和断电等。如果该位为1,则表示梯形图中对应的编程元件的线圈“得电”,其常开触点闭合、常闭触点断开,以后称该编程元件为1状态,或称该编程元件ON。反之亦反。8位二进制数组成1个字节(Byte),其中的第0位为最低位(LSB),第7位为最高位(MSB)。两个字节组成1个字(Word),两个字组成1个双字。
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