超过软件看门狗时间设定值，OK灯闪烁，CPU进入停止/严重故障模式。但是某些功能可执行。一个故障写入CPU故障表，输出进入缺省状态。CPU只通过内置以太网口与编程器通讯，不进行其它的通讯或操作。要恢复，必须将装有CPU的机架或背板重新上电。
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EG&G 15-1 USPP 151
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