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(gè)周期掃描-次會(huì)導(dǎo)致在首要單元和備用單元中不是同時(shí)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(huì)在第一個(gè)周期掃描此點(diǎn)而備用CPU在下一一個(gè)周期掃描此點(diǎn)。
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