如果恒定扫描定时器在扫描完成之前中断且前次扫描并未超调(Oversweep),那么PLC将扫描超调报警置入PLC故障表中。在下次扫描开始,PLC先置位OV-SWP故障触点。当PLC不处于恒定扫描状态或末次扫描的时间未超过恒定定时器的时间值,OV-SWP触点便复位。
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