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在多臺單機組成的自動線上,有在總操作臺上的集中控制和在單機操作臺上分散控制的聯鎖。集中與分散控制的梯形圖如圖所示。x2為選擇開關,以其觸點為集中控制與分散控制的聯鎖觸點。當 X2為ON時,為單機分散起動控制;當x2為OFF時,為集中總起動控制。在兩種情況下,單機和總操作臺都可以發出停止命令。
應用限制:
1)不能直接調用帶參數的例行程序。
2)所有被調用的例行程序名稱的第一部分必須相同,如proc1,proc2,proc3等。
3)使用CallByVar指令,就可以通過PLC輸入數字編號來調用對應不同軌跡例行程序,這樣給程序擴展帶來了極大的方便。
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