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   1．編程方法簡單易學 

    梯形圖是使用得最多的PLC的編程語言，其電路符號和表達方式與繼電器電路原理圖相似，梯形圖語言形象直觀，易學易懂，熟悉繼電器電路圖的電氣技術人員只需花幾天時間就可以熟悉梯形圖語言，并用來編制用戶程序。

    梯形圖語言實際上是一種面向用戶的高級語言，PLC在執(zhí)行梯形圖程序時，將它“翻譯”成匯編語言后再去執(zhí)行。

  2．功能強，性能價格比高     

  一臺小型PLC內(nèi)有成百上千個可供用戶使用的編程元件，有很強的功能，可以實現(xiàn)非    常復雜的控制功能。與相同功能的繼電器系統(tǒng)相比，具有很高的性能價格比。PLC可以通過通信聯(lián)網(wǎng)，實現(xiàn)分散控制，集中管理。 

  3．硬件配套齊全，用戶使用方便，適應性強 

  PLC產(chǎn)品已經(jīng)標準化、系列化、模塊化，配備有品種齊全的各種硬件裝置供用戶選用，用戶能靈活方便地進行系統(tǒng)配置，組成不同功能、不同規(guī)模的系統(tǒng)。PLC的安裝接線也很方便，一般用接線端子連接外部接線。PLC帶負載能力，可以直接驅(qū)動一般的電磁閥和中小型交流接觸器。 

  硬件配置確定后，通過修改用戶程序，就可以方便快速地適應工藝條件的變化。 

  4．可靠性高，抗干擾能力強 

    傳統(tǒng)的繼電器控制系統(tǒng)中使用了大量的中間繼電器、時間繼電器。由于觸點接觸不良，容易出現(xiàn)故障。PLC用軟件代替大量的中間繼電器和時間繼電器，僅剩下與輸入和輸出有關的少量硬件元件，接線可減少到繼電器控制系統(tǒng)的十分之一到百分之一，因觸點接觸不良造成的故障大為減少。   

    PLC使用了一系列硬件和軟件抗干擾措施，具有很強的抗干擾能力，平均無故障時間達到數(shù)萬小時以上，可以直接用于有強烈干擾的工業(yè)生產(chǎn)現(xiàn)場，PLC大用戶公認為最可靠的工業(yè)控制設備之一。 

  5．系統(tǒng)的設計、安裝、調(diào)試工作量少 

    PLC用軟件功能取代了繼電器控制系統(tǒng)中大量的中間繼電器、時間繼電器、計數(shù)器等器件，使控制柜的設計、安裝、接線工作量大大減少。 

    PLC的梯形圖程序可以用順序控制設計法來設計。這種編程方法很有規(guī)律，很容易掌握。對于復雜的控制系統(tǒng)，如果掌握了正確的設計方法，設計梯形圖的時間比設計繼電器系統(tǒng)電路圖的時間要少得多。 

    可以在實驗室模擬調(diào)試PLC的用戶程序，輸入信號用小開關來模擬，可通過PLC發(fā)光二極管觀察輸出信號的狀態(tài)。完成了系統(tǒng)的安裝和接線后，在現(xiàn)場的統(tǒng)調(diào)過程中發(fā)現(xiàn)的問題一般通過修改程序就可以解決，系統(tǒng)的調(diào)試時間比繼電器系統(tǒng)少得多。 

  6．維修工作量小，維修方便 

    PLC的故障率很低，且有完善的自診斷和顯示功能。PLC或外部的輸入裝置和執(zhí)行機構發(fā)生故障時，可以根據(jù)PLC上的發(fā)光二極管或編程器提供的信息方便地查明故障的原因，用更換模塊的方法可以迅速地排除故障。 

  7．體積小，能耗低 

    對于復雜的控制系統(tǒng)，使用PLC后，可以減少大量的中間繼電器和時間繼電器，小型PIC的體積僅相當于幾個繼電器的大小，因此可將開關柜的體積縮小到原來的l/2~1/10。 

    PLC控制系統(tǒng)的配線比繼電器控制系統(tǒng)的少得多，故可以省下大量的配線和附件，減少很多安裝接線工時，加上開關柜體積的縮小，可以節(jié)省大量的費用。

福州卓凱電子科技有限公司聯(lián)系人：林工
24小時咨詢熱線：17705012279

TEL：0591-22989937
QQ：879520885

傳真：0591-22989937
公司地址：福州市閩侯西江濱大道77號正榮潤園一號樓1205室
產(chǎn)品價格以電話或者QQ詢價為準，發(fā)布價格及圖片不做參考

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