若梯形圖中某一輸出過程映像位Q的線圈“斷電”，對應的輸出過程映像位為　　狀態，輸出刷新后，對應的硬件繼電器常開觸點　　　。

A. 0，斷開     B. 0，閉合          C. 1，斷開      D. 1，閉合

21．S7-300 每個機架*多只能安裝　　　個信號模塊、功能模塊或通信處理模塊。

A. 4           B. 8            C. 11           D. 32

22．PC編程器通過　　　與PLC(MPI口)連接。

A.CP5511+MPI電纜           B.CP5611+ MPI電纜

C.CP1512或CP1612          D. PC/MPI適配器+RS232C電纜

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