SBS PMC-3101

SBS PMC-3101

SBS PMC-3101

（1）調(diào)整編碼器的頻率至1KHZ。按下開關SB1，這時，程序中的定時器開始計時，而X0的上升沿使計數(shù)器的初始值復位，當前值為0。計數(shù)器重新開始計輸入的脈沖數(shù)。1s鐘后，定時時間到，計數(shù)停止。觀察此時的計數(shù)器當前值。從表面看，當前值應在1000左右，但實際上的當前值會少得多，為什么？

（2）調(diào)整編碼器的頻率至20HZ。重復（1）的操作，觀察計數(shù)器的當前值，與（1）有什么不同？為什么？

（3）斷開SB1，關閉編碼器電源，按下開關SB2，兩個指示燈為什么只亮一個？結合程序執(zhí)行過程分析原因。

（圖片只做參考，不代表實物圖，價格和具體內(nèi)容請電詢，感謝您的配合）


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