這樣每個周期掃描–次。Vo掃描的設(shè)置特征允許VO點(diǎn)的掃描更接近用戶邏輯中要使用此點(diǎn)的地方。VO掃描設(shè)置成不是每個周期掃描-次會導(dǎo)致在首要單元和備用單元中不是同時掃描到此VO的值。例如，如果首要和備用CPU被設(shè)置成隔周期掃描一次(period參數(shù)設(shè)置為2)，首要CPU可能會在第一個周期掃描此點(diǎn)而備用CPU在下一一個周期掃描此點(diǎn)。使用非默認(rèn)的掃描設(shè)置會造成CPU之間到達(dá)同步點(diǎn)的延遲。在確定“失敗等待時間”參數(shù)時要考慮這-點(diǎn)。

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