如果扫描完成前恒定扫描定时器时间到, CPU 将继续完成全部扫描，包括窗 口。然而，如果产生过长扫描情况它将自动提示警告。在过扫描周期的下一 个扫描周期，PLC 故障表中出现扫描超时故障。然后，在以后的扫描周期开 始时，CPU 将 OV_SWP 故障触点 (%SA0002)置 1。如果扫描时间不再超过恒 定扫描定时器 CPU 将自动复位 OV_SWP 触点。
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