描述
輸入設(shè)備選用的是按鈕SB0的常閉觸點(diǎn),輸入繼電器X0的線(xiàn)圈狀態(tài)取決于SB0的狀態(tài)。該按鈕未按下時(shí),輸入繼電器X0線(xiàn)圈狀態(tài)為”1″通電狀態(tài),程序中所有X0觸點(diǎn)均動(dòng)作,即常開(kāi)觸點(diǎn)接通,常閉觸點(diǎn)斷開(kāi);若按下該按鈕,則輸入繼電器X0線(xiàn)圈狀態(tài)為”0″斷電狀態(tài),程序中所有X0觸點(diǎn)均恢復(fù)常態(tài)。如果輸入繼電器連接的輸入設(shè)備是按鈕SB0的常開(kāi)觸點(diǎn),則情況恰好相反:在該按鈕未按下時(shí),輸入繼電器X0線(xiàn)圈狀態(tài)為”0″斷電狀態(tài),程序中所有X0觸點(diǎn)均不動(dòng)作;若按下該按鈕,輸入繼電器X0線(xiàn)圈狀態(tài)為”1″通電狀態(tài),程序中所有X0觸點(diǎn)均動(dòng)作。
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