对很多字寄存器使用同样的操作时，非直接地址非常有用。非直接地址的使用还能避免在应用程序中重复使用梯形图逻辑。也可以用在循环的情况，寄存器每次加一一个常数或某一个设定值，直到加到最大值为止。字变量中的位允许你设定字的某一位的值，可以将这一-位做为二进制表达式输入输出以及函数和调用的位参数(例如PSB)。这个特征只适用于保持型存储器的位变量。自结构的变量的位号必须为常数。.
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