點擊圖片查看大圖VRE-P062FAC
VRE-P062FAC
VRE-P062FAC
PLC的編程語言與一般計算機語言相比，具有明顯的特點，它既不同于語言，也不同與一般的匯編語言，它既要滿足易于編寫，又要滿足易于調(diào)試的要求。目前，還沒有一種對各廠家產(chǎn)品都能兼容的編程語言。如三菱公司的產(chǎn)品有它自己的編程語言，OMRON公司的產(chǎn)品也有它自己的語言。但不管什么型號的PLC，其編程語言都具有以下特點：1.圖形式指令結(jié)構(gòu)：程序由圖形方式表達，指令由不同的圖形符號組成，易于理解和記憶。系統(tǒng)的軟件開發(fā)者已把工業(yè)控制中所需的獨立運算功能編制成象征性圖形，用戶根據(jù)自己的需要把這些圖形進行組合，并填入適當(dāng)?shù)膮?shù)。在邏輯運算部分，幾乎所有的廠家都采用類似于繼電器控制電路的梯形圖，很容易接受。如西門子公司還采用控制系統(tǒng)流程圖來表示，它沿用二進制邏輯元件圖形符號來表達控制關(guān)系，很直觀易懂。較復(fù)雜的算術(shù)運算、定時計數(shù)等，一般也參照梯形圖或邏輯元件圖給予表示，雖然象征性不如邏輯運算部分，也受用戶歡迎
2.明確的變量常數(shù)：圖形符相當(dāng)于操作碼，規(guī)定了運算功能，操作數(shù)由用戶填人，如：K400，T120等。PLC中的變量和常數(shù)以及其取值范圍有
明確規(guī)定，由產(chǎn)品型號決定，可查閱產(chǎn)品目錄手冊。
3.簡化的程序結(jié)構(gòu)：PLC的程序結(jié)構(gòu)通常很簡單，典型的為塊式結(jié)構(gòu)，不同塊完成不同的功能，使程序的調(diào)試者對整個程序的控制功能和控制順序有清晰的概念。
4.簡化應(yīng)用軟件生成過程：使用匯編語言和語言編寫程序，要完成編輯、編譯和連接三個過程，而使用編程語言，只需要編輯一個過程，其余由系統(tǒng)軟件自動完成，整個編輯過程都在人機對話下進行的，不要求用戶有高深的軟件設(shè)計能力。
5.強化調(diào)試手段：無論是匯編程序，還是語言程序調(diào)試，都是令編輯人員頭疼的事，而PLC的程序調(diào)試提供了完備的條件，使用編程器，利用PLC和編程器上的按鍵、顯示和內(nèi)部編輯、調(diào)試、監(jiān)控等，并在軟件支持下，診斷和調(diào)試操作都很簡單。
總之，PLC的編程語言是面向用戶的，對使用者不要求具備高深的知識、不需要長時間的專門訓(xùn)練。
福州卓凱電子科技有限公司
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