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可編程控制器編程軟件概述

梯形圖是一種以圖形符號及圖形符號在圖中的相互關系表示控制關系的編程語言，它是從繼電器控制電路圖演變過來的。梯形圖將繼電器控制電路圖進行簡化，同時加進了許多功能強大、使用靈活的指令，將微機的特點結合進去，使編程更加容易，而實現的功能卻大大超過傳統繼電器控制電路圖，是目前最普通的一種可編程控制器編程語言。

梯形圖及符號的畫法應按一定規則，各廠家的符號和規則雖不盡相同，但基本上大同小異，如圖 1 所示。

圖 1 三種不同的梯形圖

a) 歐姆龍 b) 松下 c) 三菱

對于梯形圖的規則，總結有以下具有共性的幾點，如表 1 所示，以便讀者加深對可編程控制器變成的認識和學習。

表 1 可編程控制器部分符號意義

       1 ．梯形圖中只有動合和動斷兩種觸點。各種機型中動合觸點和動斷觸點的圖形符號基本相同，但它們的元件編號不相同，隨不同機種、不同位置（輸入或輸出）而不同。統一標記的觸點可以反復使用，次數不限，這點與繼電器控制電路中同一觸點只能使用一次不同。因為在可編程控制器中每一觸點的狀態均存入可編程控制器內部的存儲單元中，可以反復讀寫，故可以反復使用。

2 ．梯形圖中輸出繼電器（輸出變量）表示方法也不同，有圓圈、括弧和橢圓表示，而且它們的編程元件編號也不同，不論哪種產品，輸出繼電器在程序中只能使用一次。

3 ．梯形圖最左邊是起始母線，每一邏輯行必須從起始母線開始畫。梯形圖最左邊還有結束母線，一般可以將其省略。

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