描述
狀態(tài)轉(zhuǎn)移圖對(duì)應(yīng)的步進(jìn)梯形圖如圖4所示,現(xiàn)簡(jiǎn)單分析一下工作原理。當(dāng)啟動(dòng)按鈕SB1按下時(shí),X0接通,S0置1,系統(tǒng)進(jìn)入S0狀態(tài),驅(qū)動(dòng)Y6、Y0,使南北紅燈及東西綠燈同時(shí)亮,Y0接通,狀態(tài)轉(zhuǎn)移條件滿足,系統(tǒng)將轉(zhuǎn)移到S20狀態(tài),在S20狀態(tài)下,Y6、Y0仍被驅(qū)動(dòng),即南北方向的紅燈及東西方向的綠燈繼續(xù)亮,同時(shí)驅(qū)動(dòng)定時(shí)器T0,定時(shí)器的設(shè)定時(shí)間為25秒,25秒后,狀態(tài)轉(zhuǎn)移到S21,在S21狀態(tài)下,Y6繼續(xù)保持,但Y0受控于M1,而M1是由兩個(gè)定時(shí)器T6和T7控制,T6、T7組成一個(gè)1秒的震蕩器,即東西方向的綠燈閃亮。在本狀態(tài)下,同時(shí)也驅(qū)動(dòng)定時(shí)器T1,定時(shí)時(shí)間為3秒,3秒時(shí)間到,狀態(tài)轉(zhuǎn)移到S22,在S22狀態(tài)下,Y6仍然被驅(qū)動(dòng),南北方向紅燈繼續(xù)亮,同時(shí)驅(qū)動(dòng)T2、Y1,東西方向的綠燈滅,Y1口驅(qū)動(dòng)的是東西方向的黃燈,故東西方向的黃燈亮,綠燈停。T2的定時(shí)時(shí)間為2秒,2秒時(shí)間到,狀態(tài)轉(zhuǎn)移到S23,在S23狀態(tài)下,同時(shí)驅(qū)動(dòng)Y2、Y4及T3,東西方向的紅蛋亮,南北方向的綠燈亮,T3的定時(shí)時(shí)間為25秒,25秒時(shí)間到,狀態(tài)轉(zhuǎn)移到S24。在S24狀態(tài)下,驅(qū)動(dòng)Y2、T4,東西方向的紅燈繼續(xù)亮,而南北方向的綠燈驅(qū)動(dòng)口Y4受控于M1,M1是震蕩周期為1秒的震蕩器,故南北方向的綠燈閃亮。T4的定時(shí)時(shí)間是3秒,3秒后,狀態(tài)轉(zhuǎn)移到S25。在S25狀態(tài)下,同時(shí)驅(qū)動(dòng)Y2、Y5及T5,即東西方向的紅燈、南北的黃燈亮,T5定時(shí)器的定時(shí)時(shí)間為2秒,2秒時(shí)間到,定時(shí)器的定時(shí)時(shí)間到,T5的觸點(diǎn)接通,狀態(tài)又重新轉(zhuǎn)移到S0。即南北方向的紅燈、東西方向的綠燈亮,系統(tǒng)將重復(fù)上述的動(dòng)作順序,周而復(fù)始的繼續(xù)工作。當(dāng)停止按鈕SB2被按下時(shí),軟繼電器M0接通,其常閉觸點(diǎn)M0斷開,系統(tǒng)執(zhí)行一周后,將停留在S0狀態(tài),及保持南北方向的紅燈、東西方向的綠燈亮。
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