140NRP31201
140NRP31201
140NRP31201
当PLC运行时，是通过执行反映控制要求的用户程序来完成控制任务的，需要执行众多的操作，但CPU不可能同时去执行多个操作，它只能按分时操作（串行工作）方式，每一次执行一个操作，按顺序逐个执行。由于CPU的运算处理速度很快，所以从宏观上来看，PLC外部出现的结果似乎是同时（并行）完成的。这种串行工作过程称为PLC的扫描工作方式。
用扫描工作方式执行用户程序时，扫描是从条程序开始，在无中断或跳转控制的情况下，按程序存储顺序的先后，逐条执行用户程序，直到程序结束。然后再从头开始扫描执行，周而复始重复运行。
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