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軟件方面： 
PLC的工作方式為掃描加中斷，這既可保證它能有序地工作，避免繼電控制系統(tǒng)常出現(xiàn)的"冒險(xiǎn)競爭"，其控制結(jié)果總是確定的；而且又能應(yīng)急處理急于處理的控制，保證了PLC對應(yīng)急情況的及時(shí)響應(yīng)，使PLC能可靠地工作。 
為監(jiān)控PLC運(yùn)行程序是否正常，PLC系統(tǒng)都設(shè)置了"看門狗"（Watchingdog）監(jiān)控程序。運(yùn)行用戶程序開始時(shí)，先清"看門狗"定時(shí)器，并開始計(jì)時(shí)。當(dāng)用戶程序一個(gè)循環(huán)運(yùn)行完了，則查看定時(shí)器的計(jì)時(shí)值。若超時(shí)（一般不超過100ms），則報(bào)警。嚴(yán)重超時(shí)，還可使PLC停止工作。用戶可依報(bào)警信號采取相應(yīng)的應(yīng)急措施。定時(shí)器的計(jì)時(shí)值若不超時(shí)，則重復(fù)起始的過程，PLC將正常工作。顯然，有了這個(gè)"看門狗"監(jiān)控程序，可保證PLC用戶程序的正常運(yùn)行，可避免出現(xiàn)"死循環(huán)"而影響其工作的可靠性。 
PLC還有很多防止及檢測故障的指令，以產(chǎn)生各重要模塊工作正常與否的提示信號?？赏ㄟ^編制相應(yīng)的用戶程序，對PLC的工作狀況，以及PLC所控制的系統(tǒng)進(jìn)行監(jiān)控，以確保其可靠工作。 
PLC每次上電后，還都要運(yùn)行自檢程序及對系統(tǒng)進(jìn)行初始化。這是系統(tǒng)程序配置了的，用戶可不干預(yù)。出現(xiàn)故障時(shí)有相應(yīng)的出錯(cuò)信號提示。 
正是PLC在軟、硬件諸方面有強(qiáng)有力的可靠性措施，才確保了PLC具有可靠工作的特點(diǎn)。它的均勻*時(shí)間可達(dá)幾萬小時(shí)以上；出了故障均勻修復(fù)時(shí)間也很短，幾小時(shí)以至于幾分鐘即可。 
曾有人做過為什么要使用PLC的問卷調(diào)查。在回答中，多數(shù)用戶把PLC工作可靠作為選用它的主要原因，即把PLC能可靠工作，作為它的*指標(biāo)。 
2.4經(jīng)濟(jì)合算 
*的使用必將帶來巨大的社會(huì)效益與經(jīng)濟(jì)效益，這是科技是*生產(chǎn)力的體現(xiàn)，也是*生命力之所在。PLC也是如此。
盡管使用PLC*投資要大些，但從全面及長遠(yuǎn)看，使用PLC還是經(jīng)濟(jì)的。這是由于： 
使用PLC的投資雖大，但它的體積小、所占空間小，輔助設(shè)施的投進(jìn)少；使用時(shí)省電，運(yùn)行費(fèi)少；工作可靠，停工損失少；維修簡單，維修費(fèi)少；還可再次使用以及能帶來附加價(jià)值等等，從中可得更大的回報(bào)。所以，在多數(shù)情況下，它的效益是可觀的。
3. 基本應(yīng)用
zui初，PLC主要用于開關(guān)量的邏輯控制。隨著PLC技術(shù)的進(jìn)步，它的應(yīng)用領(lǐng)域不斷擴(kuò)大。 
如今，PLC不僅用于開關(guān)量控制，還用于模擬量及數(shù)字量的控制，可采集與存儲(chǔ)數(shù)據(jù)，還可對控制系統(tǒng)進(jìn)行監(jiān)控；還可聯(lián)網(wǎng)、通訊，實(shí)現(xiàn)大范圍、跨地域的控制與治理。PLC已日益成為產(chǎn)業(yè)控制裝置家族中一個(gè)重要的角色。。 
3.1用于開關(guān)量控制 
PLC控制開關(guān)量的能力是很強(qiáng)的。所控制的進(jìn)出點(diǎn)數(shù)，少的十幾點(diǎn)、幾十點(diǎn)，多的可到幾百、幾千，甚至幾萬點(diǎn)。由于它能聯(lián)網(wǎng)，點(diǎn)數(shù)幾乎不受限制，不管多少點(diǎn)都能控制。 
所控制的邏輯題目可以是多種多樣的：組合的、時(shí)序的；即時(shí)的、延時(shí)的；不需計(jì)數(shù)的，需要計(jì)數(shù)的；固定順序的，隨機(jī)工作的；等等，都可進(jìn)行。 

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