在雙總線網(wǎng)絡(luò)中，這樣放置總線控制器可以最大限度減小兩個(gè)單元之間總線的擁堵。總線擁堵的結(jié)果是–些設(shè)備交換總線控制權(quán)，使其它的設(shè)備不能被其中一個(gè)單元讀寫(xiě)。這種錯(cuò)誤情況下第一-單元會(huì)控制VO,以免輸入丟失和輸出不同步。

 

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