SIEMENS 505-4732

   互為冗余的兩個(gè)主控制卡作為一個(gè)整體與外界交換信息（網(wǎng)絡(luò)通訊、I/O通訊），共享進(jìn)入這個(gè)整體的輸入信息，這就是冗余部件的同一性（也可以稱為單一性）。對外輸出信息時(shí)工作卡掌握主動權(quán)，代表這個(gè)整體發(fā)言，即冗余的協(xié)同性。通俗地講，兩個(gè)互為冗余的部件，對于用戶使用和外部控制對象而言，可被視為一個(gè)整體。 
    為了保證互為冗余的兩個(gè)卡件具有平等獲取外部信息（I/O通訊、網(wǎng)絡(luò)通訊）的權(quán)利，冗余部件具有同樣的通訊接口，保證卡件內(nèi)輸入信息的*。冗余的兩塊卡件有各自的通訊通路，只要保證相同的輸入信息在兩個(gè)通信通路上同時(shí)進(jìn)行傳輸，兩塊卡件就可以獲得相同的信息。

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