注意:使用一個ONDTR功能塊的最好方式就是，每次描從-一個特別的基準(zhǔn)地址調(diào)用一次。每次掃描不要從一個特別的基準(zhǔn)地址調(diào)用ONDTR多于–次(否則會導(dǎo)致不適當(dāng)?shù)挠?jì)時結(jié)果)。當(dāng)一個ONDTR出現(xiàn)在–個程序塊中，每次掃描就累計(jì)一次時間。相同掃描期內(nèi)后來調(diào)用該程序塊將對ONDTR沒有影響。不要在兩個不同子程序中編入帶相同的基準(zhǔn)地址的ONDTR功能塊。不應(yīng)該編–個圍繞定時器功能的跳轉(zhuǎn)的程序。

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