【正文】 LD O AN = LD LPS AN AN T41 TON T37 , +250 LRD A T37 TON T38 , +250 LRD A T38 TON T39 , +30 LRD A T39 TON T40 , +20 LRD A T37 TON T41 , +300 LRD A T44 TON T42 , +20 LRD AN AN T37 TON T43 , +200 LRD A T43 TON T44 , +30 LRD AN T46 TON T45 , +5 LRD A T45 TON T46 , +5 LRD AN T37 AN = 16 LRD LD AN T38 LD T 38 AN T39 A T45 OLD ALD = LRD AN T38 AN T40 = LRD LD AN T43 LD T43 AN T44 A T45 OLD ALD = LPP LPS A T44 AN T42 = LRD A T37 = LPP A A = 程序說明 (1)按下啟動(dòng)按鈕 SB1， 閉合， M0 接通閉合并自鎖。 (2)經(jīng)過 20S 后，第 9 邏輯行行中的 T43 動(dòng)作，第 17 邏輯行中的計(jì)時(shí)器 T43 的常閉觸點(diǎn)斷開， 斷電；第 18 邏輯行中的 T43 的常開 觸點(diǎn)閉合，使得當(dāng) T45 常開觸點(diǎn)閉合是 接通， T45 的常開觸點(diǎn)斷開時(shí) 斷開，此時(shí)東 、 西綠燈閃爍。 (4)當(dāng)東 、 西黃燈停止工作時(shí)，第 3 邏輯中的計(jì)時(shí)器 T37 正好經(jīng)過 25S 計(jì)時(shí)動(dòng)作，第 13邏輯行中的 T37 的常閉觸點(diǎn)斷開，南 、 北紅燈熄滅；第 20 邏輯行中的 T37 的常開觸點(diǎn)閉合， 接通，東 、 西紅燈工作；由于 的接通，因而第 14 邏輯行中的 的常開觸點(diǎn)閉合，南 、 北綠燈工作。 (6)經(jīng)過 25S 后，第 4 邏輯行中的 T38 動(dòng)作，第 14 邏輯行中的計(jì)時(shí)器 T38 的常閉觸點(diǎn)斷開， 斷電；第 15 邏輯行中的 T38 的常開觸點(diǎn)閉合，使得當(dāng) T45 的常開觸點(diǎn)閉合時(shí) 接通， T45 常開觸點(diǎn)斷開時(shí) 斷開，此時(shí)南 、 北綠燈閃爍。 (8)當(dāng)南 、 北向黃燈停止工作時(shí)，正好東 、 西向紅燈工作了 30S，即第 7 邏輯行中的 T41計(jì)時(shí) 30S，此時(shí) T41 動(dòng)作，第 3 邏輯行中的 T37 復(fù)位，且使得第 1 20 邏輯行中的常開觸點(diǎn)復(fù)位，進(jìn)入下一次循環(huán)。十字路口交通燈控制系統(tǒng)利用了西門子 S7200 系列 PLC 的特點(diǎn)，對(duì)按鈕 、 開關(guān) 、 交通等輸入 /輸出點(diǎn)進(jìn)行控制，實(shí)現(xiàn)了十字路口交通燈控制中的自動(dòng) 化。 參考文獻(xiàn) [1] 廖常初 《可編程序控制器的編程方法與工程應(yīng)用》 [M] 重慶大學(xué)出版社 [2] 鐘肇新 彭侃 《可編程序控制器原理及應(yīng)用》 [M] 華南理工大學(xué)出版社 [3] 戴仙金 《 西門子 S7200系列 PLC應(yīng)用與開發(fā) 》 [M] 中國(guó)水利水電出版社 [4] 羅宇航 《 流行 PLC實(shí)用程序及設(shè)計(jì) 》 [M] 西安電子科技大學(xué)出版社 [5] 張立科 《 PLC應(yīng)用開發(fā)技術(shù)與工程實(shí)踐 》 [M] 人民郵電出版社 致 謝 經(jīng)過近一個(gè)學(xué)期的努力， PLC 在交通信號(hào)燈中的應(yīng)用的設(shè)計(jì)順利完成了。 在本次論文寫作過程中，一直給與關(guān)心和幫助的領(lǐng)導(dǎo)和老師表示深深的謝意，特別是楊熙老師，她高度負(fù)責(zé)的指導(dǎo)和安排了論文的寫作，再次向她表示謝意 。 ag an employment tribunal clai Emloyment tribunals sort out disagreements between employers and employees. You may need to make a claim to an employment tribunal if: you don39。t appealed against the disciplinary action your employer has taken against you. However, if you win your case, the tribunal may reduce any pensation awarded to you as a result of your failure to appeal. Remember that in most cases you must make an application to an employment tribunal within three months of the date when the event you are plaining about happened. If your application is received after this time limit, the tribunal will not usually accept i. If you are worried about how the time limits apply to you If you are being represented by a solicitor at the tribunal, they may ask you to sign an agreement where you pay their fee out of your pensation if you win the case. This is known as a damagesbased agreement. In England and Wales, your solicitor can39。re clear about the terms of the agreement. It might be best to get advice from an experienced adviser, for example, at a Citizens Advice Bureau. To find your nearest CAB, including those that give advice by , click on nearest CAB. For more information about making a claim to an employment tribunal, see Employment tribunals. The (lack of) air up there Cay man Islandsbased Webb, the Watch m head of Fifa39。s 150th anniversary celebrations and will attend City39。s about how he felt and I would like to speak to him first to find out what his experience was. Uefa has opened disciplinary proceedings against CSKA for the racist behaviour of their fans during City39。s governing body, has also ordered an immediate investigation into the referee39。s plaint. In a statement the Russian side added: We found no racist insults from fans of CSKA. Age has reached the end of the beginning of a word. May be guilty in his seems to passing a lot of different life became the appearance of the same day?；蛟S是愧疚于自 20 己似乎把轉(zhuǎn)瞬即逝的很多個(gè)不同的日子過成了同一天的樣子；或許是追溯過去，對(duì)自己那些近乎偏執(zhí)的怪異信念的醒悟 ，這些天以來，思緒一直很凌亂，在腦海中不斷糾纏。二十年的人生軌跡深深淺淺，突然就感覺到有些事情，非做不可了。 Junior high school, thought to have a crush on just means that the real growth, but over the past three years later, his writing of alumni in peace, suddenly found that isn39。 Then in high school, think don39。t remember his appearance. 童年時(shí)，覺得壓歲錢和新衣服是過年必備，但是隨著年齡的推進(jìn)，會(huì)越來越發(fā)現(xiàn)，那些東西根本就可有可無；初中時(shí)，以為要有一場(chǎng)暗戀才意味著真正的成長(zhǎng)，但三年過去后，自己心平氣和的寫同學(xué)錄的時(shí)候，突然就 發(fā)現(xiàn)是不是真正的成長(zhǎng)了，好像并沒有那么重要了；然后到了高中，覺得非要吐露出自己的心聲才能為高中生涯里的懵懂情愫劃上一個(gè)句點(diǎn)，但畢業(yè)晚會(huì)的時(shí)候最終還是被梗塞在了咽喉，后來再次站在他曾經(jīng)揮汗如雨的球場(chǎng)，看著他投過籃球的球框時(shí)，突然間發(fā)現(xiàn)自己已經(jīng)想不起