在一個每次掃描都不調(diào)用的程序塊中使用OFDT,除非定時器復(fù)位，不然在程序塊內(nèi)的定時器計時。這意味著OFDT功能塊象–個比主程序塊中定時器掃描更慢的定時器一樣運(yùn)行。對那些長時間的非活動的程序塊，對OFDT編程時應(yīng)該考慮到這種追趕特性。

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