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　PLC與單片機的差別是：
　　1、PLC是應用單片機構成的比較成熟的控制系統(tǒng)，是已經(jīng)調試成熟穩(wěn)定的單片機應用系統(tǒng)的產(chǎn)品，有較強的通用性。
　　2、而單片機可以構成各種各樣的應用系統(tǒng)，使用范圍更廣。單就“單片機”而言，它只是一種集成電路，還必須與其它元器件及軟件構成系統(tǒng)才能應用。
　　3、從工程的使用來看，對單項工程或重復數(shù)極少的項目，采用PLC快捷方便，成功率高，可靠性好，但成本較高。
　　4、對于量大的配套項目，采用單片機系統(tǒng)具有成本低、效益高的優(yōu)點，但這要有相當?shù)难邪l(fā)力量和行業(yè)經(jīng)驗才能使系統(tǒng)穩(wěn)定。
　　從本質上說，PLC其實就是一套已經(jīng)做好的單片機(單片機范圍很廣的)系統(tǒng)。
　　但PLC也有其特點：PLC廣泛使用梯形圖代替計算機語言，對編程有一定的優(yōu)勢。你可以把梯形圖理解成是與匯編等計算器語言一樣，是一種編程語言，只是使用范圍不同!而且通常做法是由PLC軟件把你的梯形圖轉換成C或匯編語言(由PLC所使用的CPU決定)，然后利用匯編或C編譯系統(tǒng)編譯成機器碼!PLC運行的只是機器碼而已。梯形圖只是讓使用者更加容易使用而已。
　　如上所說，那么MCS-51單片機當然也可以用于PLC制作，只是8位CPU在一些高級應用如： 大量運算(包括浮點運算)，嵌入式系統(tǒng)(現(xiàn)在UCOS也能移植到MCS-51)等，有些力不從心而已，不過加上DSP就已經(jīng)能滿足一般要求了，而且同樣使用梯形圖編程，我們可把梯形圖轉化為C51再利用KEIL的C51進行編譯。我們也能發(fā)現(xiàn)不用型號的PLC會選用不同的CPU，其實也說明PLC就是一套已經(jīng)做好的單片機系統(tǒng)。
　　既然如此，當然也可以用單片機直接開發(fā)控制系統(tǒng)，但是對開發(fā)者要求相當高(不是一般水平可以勝任的)，開發(fā)周期長，成本高(對于一些大型一點的體統(tǒng)你需要做實驗，印刷電路板就需要一筆相當?shù)馁M用，你可以說你用仿真器，用實驗板來開發(fā)，但是我要告訴你，那樣做你只是驗證了硬件與軟件的可行性，并不代表可以用在工業(yè)控制系統(tǒng)，因為工業(yè)控制系對抗干擾的要求非常高，穩(wěn)定第一，而不是性能第一，所以你的電路板設計必須不斷實驗，改進)。當你解決了上述問題，你就發(fā)現(xiàn)你已經(jīng)做了一臺PLC了，當然如果需要別人能容易使用你還需要一套使用軟件，這樣你可以不需要把你的電路告訴別人。你也不可能告訴別人。
　　這樣一看PLC其實并不神秘，不少PLC是很簡單的，其內(nèi)部的CPU除了速度快之外，其他功能還不如普通的單片機。通常PLC采用16位或32位的CPU，帶1或2個的串行通道與外界通訊，內(nèi)部有一個定時器即可，若要提高可靠性再加一個看家狗定時器問題就解決了。
　　另外，PLC的關鍵技術在于其內(nèi)部固化了一個能解釋梯形圖語言的程序及輔助通訊程序，梯形圖語言的解釋程序的效率決定了PLC的性能，通訊程序決定了PLC與外界交換信息的難易。對于簡單的應用，通常以獨立控制器的方式運作，不需與外界交換信息，只需內(nèi)部固化有能解釋梯形圖語言的程序即可。實際上，設計PLC的主要工作就是開發(fā)解釋梯形圖語言的程序?，F(xiàn)在的單片機完全可以取代PLC。以前的單片機由于穩(wěn)定性和抗電磁干擾能力比較的弱和PLC是沒有辦法相比的，現(xiàn)在的單片機可能已經(jīng)做到了高穩(wěn)定性和很強的抗干擾能力在某些領域已經(jīng)實現(xiàn)了替換。
 

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