品牌:其他 | 規格:?NI AD-091A | 材質:?NI AD-091A |
產地:美國 |
NI AD-091A
NI AD-091A
NI AD-091A
控制係統的功能和管理係統的功能應嚴格劃分界限
由於可編程序控制器組成的過程控制係統中的實時性要求很高,而網絡通信是允許暫時失去通信聯係,過後自己能重新恢復,但是在重新恢復之前這一間隔時間可編程序控制器會處於失控。另外,在用多個可編程序控制器係統組成一個大係統時,對於主控制的關鍵命令,除了使用可編程序控制器自身的網絡通信傳送它的信息外,好有使用它的I/O點做成的硬件聯鎖,特別是兩者之間“急停”的處理
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