当START和END的值设置相等，程序循环仅执行一次。当START的值不能增加/减少到END的值时，不执行循环语句。例如，START的值10,END的值是5，INCREMENT的值是1，能流直接从FOR语句跳转到END_ FOR语句后面的语句。注意:如果在第一-次测试时，FOR_ LOOP指令的使能输入有能流，

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