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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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