这样每个周期扫描–次。Vo扫描的设置特征允许VO点的扫描更接近用户逻辑中要使用此点的地方。VO扫描设置成不是每个周期扫描-次会导致在首要单元和备用单元中不是同时扫描到此VO的值。例如,如果首要和备用CPU被设置成隔周期扫描一次(period参数设置为2),首要CPU可能会在第一个周期扫描此点而备用CPU在下一一个周期扫描此点。使用非默认的扫描设置会造成CPU之间到达同步点的延迟。在确定“失败等待时间”参数时要考虑这-点。
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