【正文】
LD M0 OR Y006 OUT T0 ANI X001 K20 OUT Y006 LD T0 LD Y006 OUT Y005 OUT M0所對應(yīng)的梯形圖為:當(dāng)按下啟動(dòng)按鈕S3(X002得電),傳送電動(dòng)機(jī)M3(Y006)得電,再運(yùn)用置守的方法。4.5.3 送料電動(dòng)機(jī)M2運(yùn)行后延時(shí)2S送料電動(dòng)機(jī)M1運(yùn)行;送料電動(dòng)機(jī)M1運(yùn)行后延時(shí)2S料斗K2打開出料。T2得電后,Y001得電,料斗K2打開出料。此時(shí)的程序?yàn)椋? LDI X001 OUT Y001 OR Y004 OR Y001 LD Y001 ANI T3 AND Y006 OR M3 OUT Y004 AND Y005 OUT M3 ANI Y004 AND Y004 LD M3 OUT T3 K20所對應(yīng)的梯形圖為:當(dāng)稱重開關(guān)S2斷開(即PLC梯形圖中點(diǎn)動(dòng)X001),Y001失電,即料斗K2關(guān)閉,則Y001為常閉觸點(diǎn),則輔助繼電器M3得電,延時(shí)繼電器T3從而也得電,延時(shí)2S,2S后送料電動(dòng)機(jī)M1停止。此時(shí)的程序?yàn)椋? LD Y004 ANI M4