程序循环功能循环执行梯级逻辑指定次数，同时变更INDEX(当前循环计数)变量的值。程序循环功能开始于FOR_ _LOOP指令，结束于END_ FOR指令。重复执行的梯级逻辑循环于FOR_ LOOP和END_ FOR这两个指令之间。在正常结東循环之前条件具备，EXIT_ FOR指令激活，那么就结束循环。.

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