Modicon AS-H827-209

  整個設施保護系統(tǒng)的工作過程是：PLC處理器通過遠程I/O對生產(chǎn)設備的壓力、溫度、流量、轉速等狀態(tài)進行判斷。一旦檢測到非正常工作情況，則立即將生產(chǎn)設備進行全部或局部關停，同時通過人機界面向操作員報警。

    除了由傳感器檢測到的非正常生產(chǎn)狀態(tài)可產(chǎn)生關停止指令以外，設施保護系統(tǒng)同時提供了手動按鈕用以產(chǎn)生手動關停止指令。手動按鈕散布在生產(chǎn)區(qū)各處，由操作人員根據(jù)具體事故情況決定是否發(fā)出關停指令。

    設施保護系統(tǒng)還提供了旁通（Bypass）功能。當維修人員對傳感器進行檢測或維修時，為了防止設施保護系統(tǒng)產(chǎn)生誤動作，需要在梯形圖程序中設置旁通位，以便將被維護儀表產(chǎn)生的誤關停信號進暫時屏蔽處理。

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