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。在每次邏輯掃描期間，timer_ A和timer_ B都被執(zhí)行。然而，只有在timer_ A中的成員變量被更新，timer_ B中的成員變量–直保持為0。

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