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產(chǎn)品型號:DSQC609
產(chǎn)品品牌:ABB
PLC內(nèi)部具有豐富的軟元件,如定時器、計數(shù)器、輔助繼電器等,利用它們來設(shè)計一些程序,可以屏蔽輸入元件的誤信號,防止輸出元件的誤動作。在設(shè)計應(yīng)用程序時,可以利用"看門狗"方法實現(xiàn)對系統(tǒng)各組成部分運行狀態(tài)的監(jiān)控。如用PLC控制某一運動部件時,編程時可定義一個定時器作"看門狗"用,對運動部件的工作狀態(tài)進行監(jiān)視。定時器的設(shè)定值,為運動部件所需要的最大可能時間。在發(fā)出該部件的動作指令時,同時啟動"看門狗"定時器。若運動部件在規(guī)定時間內(nèi)達到指定位置,發(fā)出一個動作完成信號,使定時器清零,說明監(jiān)控對象工作正常;否則,說明監(jiān)控對象工作不正常,發(fā)出報警或停止工作信號。 PLC停止在某些輸出被激勵的地方(通常是處于中間狀態(tài))。查找與處理:查找引起下一步操作發(fā)生的信號(輸入、定時器、線川、鼓輪控制器等),將編程器置于顯示那個信號的ON/OFF狀態(tài)。
廈門仲鑫航自動化設(shè)備有限公司
聯(lián)系人:鄭美愛 手機:18020776785 電話:0592-5087595 傳真:0592-5165561(傳真請備注”鄭美愛“收)
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DSQC609