為了解決上述問題，ADD指令的使能輸入應(yīng)該來自一個跳變(單觸發(fā))線圈，如下面所述。在改良的電路里，%10001輸入開關(guān)控制–個跳變(單觸發(fā))線圈，%M0001的觸點接通ADD功能塊的使能輸入，每次掃描%M000使觸點%10001閉合-次。為了使%M0001觸點再次閉合，觸點%10001只能再次分來閉合。

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