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產(chǎn)品型號(hào)：DSQC609
產(chǎn)品品牌：ABB
PLC內(nèi)部具有豐富的軟元件，如定時(shí)器、計(jì)數(shù)器、輔助繼電器等，利用它們來設(shè)計(jì)一些程序，可以屏蔽輸入元件的誤信號(hào)，防止輸出元件的誤動(dòng)作。在設(shè)計(jì)應(yīng)用程序時(shí)，可以利用"看門狗"方法實(shí)現(xiàn)對(duì)系統(tǒng)各組成部分運(yùn)行狀態(tài)的監(jiān)控。如用PLC控制某一運(yùn)動(dòng)部件時(shí)，編程時(shí)可定義一個(gè)定時(shí)器作"看門狗"用，對(duì)運(yùn)動(dòng)部件的工作狀態(tài)進(jìn)行監(jiān)視。定時(shí)器的設(shè)定值，為運(yùn)動(dòng)部件所需要的最大可能時(shí)間。在發(fā)出該部件的動(dòng)作指令時(shí)，同時(shí)啟動(dòng)"看門狗"定時(shí)器。若運(yùn)動(dòng)部件在規(guī)定時(shí)間內(nèi)達(dá)到指定位置，發(fā)出一個(gè)動(dòng)作完成信號(hào)，使定時(shí)器清零，說明監(jiān)控對(duì)象工作正常；否則，說明監(jiān)控對(duì)象工作不正常，發(fā)出報(bào)警或停止工作信號(hào)。 PLC停止在某些輸出被激勵(lì)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(hào)（輸入、定時(shí)器、線川、鼓輪控制器等），將編程器置于顯示那個(gè)信號(hào)的ON/OFF狀態(tài)。
廈門仲鑫航自動(dòng)化設(shè)備有限公司
聯(lián)系人：鄭美愛 手機(jī)：18020776785 電話：0592-5087595 傳真：0592-5165561（傳真請(qǐng)備注”鄭美愛“收）
QQ：2804446845 郵箱：2804446845@qq.com
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DSQC609
