【IC697BEM711】【IC697BEM711】

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看門狗復位指令WDR（Watchdog Reset）

    WDR稱為看門狗復位指令，也稱為警戒時鐘刷新指令。它可以把警戒時鐘刷新，即延長掃描周期，從而有效地避免看門狗超時錯誤。WDR指令在梯形圖中以線圈形式編程，無操作數。 

    使用WDR指令時要特別小心，如果因為使用WRD指令而使掃描時間拖得過長(如在循 環結構中使用WDR)，那么在中止本次掃描前，下列操作過程將被禁止： 

：張亮（工程師）    專線：
24小時移動專線：         【】

    (1)通訊(自由口除外)； 

    (2)I／O刷新(直接I／O除外)； 

    (3)強制刷新； 

    (4)SM位刷新(SM0、SM5一SM29的位不能被刷新)； 

    (5)運行時間診斷； 

    (6)掃描時間超過25 s時，使10 ms和100 ms定時器不能正確計時； 

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