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。PV的范圍是0到+32,767時間單位。如果PV超出范圍，不影響定時器字2。這個定時器保持在失電時狀態(tài):上電時不自動初始化。當OFDT接收能流時，CV設置為0,定時器向右傳送能量。OFDT接收能流時輸出保持。

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