A06B-6134-K003，A06B-6134-K003，A06B-6134-K003
PLC五種編程語言特點比較
梯形圖(LD)
梯形圖是使用得最多的PLC圖形編程語言。梯形圖與繼電器控制系統的電路圖很相似，直觀易懂，很容易被工廠熟悉繼電器控制的電氣人員掌握，特別適用于開關量邏輯控制。圖3–3和圖3–4中用西門子S7–200系列PLC的3種編程語言來表示同一邏輯關系。西門子的說明書中將指令表稱為語句表。
梯形圖由觸點、線圈和應用指令等組成。觸點代表邏輯輸入條件，如外部的開關、按鈕和內部條件等。線圈通常代表邏輯輸出結果，用來控制外部的指示燈、交流接觸器和內部的輸出標志位等。
在分析梯形圖中的邏輯關系時，為了借用繼電器電路圖的分析方法，可以想像左右兩側垂直母線之間有一個左正右負的直流電源電壓(有時省略了右側的垂直母線)，當圖3–3中I0.1與I0.2的觸點接通，或M0.3與I0.2的觸點接通時，有一個假想的“能流”(Power flow)流過Q1.1的線圈。利用能流這一概念，可以幫助我們更好地理解和分析梯形圖，能流只能從左向右流動。
圖3—5a中的電路不能用觸點的串并聯來表示，能流可能從兩個方向流過觸點5(經過觸點1，5，4或經過觸點3，5，2)，無法將該圖轉換為指令表，應將它改畫為圖3–5b所示的等效電路。
使用編程軟件可以直接生成和編輯梯形圖，并將它下載到PLC中去。
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