只有第–次執(zhí)行實例會更新它的定時器。如果-個不同的實例接著被執(zhí)行，它的定時器值將保持不變。在一次邏輯掃描期間對一個功能塊的多次調(diào)用的情況下，只有第–次調(diào)用會向它的定時器功能塊增加總時間。這個動作和在–個正常程序塊的定時器的動作是匹配的。范例;-一個功能塊被定義為對一個定時器功能塊使用一一個成員變量。該功能塊的兩個實例timer.A和timer_ _B被建立。

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