A06B-6077-K143(K144),A06B-6077-K143(K144),A06B-6077-K143(K144)
常閉觸點(diǎn)輸入信號(hào)處理的電路圖及PLC梯形圖
在些輸入信號(hào)只能由常閉觸點(diǎn)提供，圖1a是控制電機(jī)運(yùn)行的繼電路圖，SB1和SB2分別是起動(dòng)按鈕和停止按鈕，如果將它們的常開觸點(diǎn)接到PLC的輸入端，梯形圖中觸點(diǎn)的類型與圖1a完全一致。如果接入PLC的是SB2的常閉觸點(diǎn)，按下圖1b中的SB2，其常閉觸點(diǎn)斷開，X1變?yōu)?/span>OFF，它的常開觸點(diǎn)斷開，顯然在梯形圖中應(yīng)將X1的常開觸點(diǎn)與Y0的線圈串聯(lián)（見圖1c），但是這時(shí)在梯形圖中所用的X1的觸點(diǎn)類型與PLC外接SB2的常開觸點(diǎn)時(shí)剛好相反，與繼電器電路圖中的習(xí)慣也是相反的。建議盡可能用常開觸點(diǎn)作PLC的輸入信號(hào)。
如果某些信號(hào)只能用常閉觸點(diǎn)輸入，可以按輸入全部為常開觸點(diǎn)來設(shè)計(jì)，然后將梯形圖中相應(yīng)的輸入繼電器的觸點(diǎn)改為相反的觸點(diǎn)，即常開觸點(diǎn)改為常閉觸點(diǎn)，常閉觸點(diǎn)改為常開觸點(diǎn)。
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