【正文】 ed clock signal, its characteristics to lie in, its data is partition, the longlost send out and accept, be the CPU is too busy of time can grind to a stop sex to work, also reduced the difficulty on the hardware, the data throw to lose at the same time opposite want to be little, we can pass the examination of the data to observe whether the data that we send out has the mistake or not, be like strange accidentally the method, tired addition and eight efficacies method etc., can use to helps whether the data that we examine to send out have or not the mistake occurrence, pass the feedback to carry on the discriminator. A line of transmission of the information contains a string of and bine the cent of: The usual PLC is 8 machines, certainly also having 16 machines. We can be an at the time of sending out the data a send out to the other party, also can be 88 send out the data to the other party, an and 8 differentiations are also the as that we say to send out the data and bine sends out the data. A speed is more and slowly, but as long as 2 or three lines can solve problem, and can use the telephone line to carry on the long range control. But bine the ocular transmission speed is very quick of, it is a string of ocular of 25600%, occupy the advantage in the short distance, the in view of the fact TTL electricity is even, being limited by the scope of one meter generally, it bine unwell used for the data transmission of the long pull, thus the cost is too expensive. Under a lot of circumstances we are total to like to adopt the string to bine the conversion chip to carry on deliver, under this kind of circumstance not need us to carry on to deposited the machine to establish too and plicatedly, but carry on the data exchanges through the data transmission instruction directly, but is not a very viable way in the correspondence, because the PLC of the other party must has been wait for your data exportation at the time of sending out the data, it can39。t send out and accept at the same time, for example when you make a phone call is to can39。t guarantee the equipments by the control of the single machine, but pass the information exchanges of the equipments and equipments to attain the result that we want. For example fore pack and the examination of the empress work preface, we will arrive wrapping information feedback to examine the place, and examine the information of the place to also want the feedback to packing. Pass the information share thus to make both the chain connect, being a total body, the match of your that thus make is more close, at each other attain to reflect the result that mutually flick. The PLC correspondence has already e more body now its value, at the PLC and correspondence between PLCs, can pass the munication of the information and the share of the dates to guarantee that of the equipments moderates mutually, the result that arrive already to repair with each other. Data conversion the adoption RS232 between PLC connect to e to the transmission data, but the RS232 pick up a people and can guarantee 10 meters only of deliver the distance, if in the distance of 1000 meters we can pass the RS485 to carry on the correspondence, the longer distance can pass the MODEL only to carry on deliver. The PLC data transmission is just to be called a form to it in a piece of and continuous address that the data of the inner part delivers the other party, we, the PLC of the other party passes to read data in the watch to carry on the operation. If the data that data in the watch is a to establish generally, that is just the general data transmission, for example today of oil price rise, I want to deliver the price of the oil price to lose the oil ally on board, that is the share of the data。 But lead even is a fatal error greatly is what we can39。 And the PLC emergence also became the epochmaking topic, adding the vivid software control through a very and stable hardware, making the automation head for the new high tide. The PLC biggest characteristics lie in: The electrical engineering teacher already no longer electric hardware up too many calculations of cost, as long as order the importation that the button switch or the importation of the sensors order to link the PLC up can solve problem, pass to output to order the conjunction contact machine or control the start equipments of the big power after the electric appliances, but the exportation equipments direct conjunction of the small power can. PLC internal containment have the CPU of the CPU, and take to have an I/ O for expand of exterior to connect a people39。t guarantee the request of the higher quantity and high new the image of the technique business enterprise. The people see in produce practice, automate brought the tremendous convenience and the product quantities for people up of assurance, also eased the personnel39。西門子 S7200PLC 入門 [M] 可編程序控制器原理及應(yīng)用系統(tǒng)設(shè)計(jì)技術(shù) [M] 北京：化學(xué)工業(yè)出版社。哈爾濱工業(yè)大學(xué)出版社， 2021 【 5】 吳中俊，黃永紅 北京：北京航空航天大學(xué)出版社，2021 【 3】 周美蘭，周封，忘岳宇最后，對幫助我的同學(xué)表示感謝，這次設(shè)計(jì)能取得成功，也離不開彼此之間的團(tuán)結(jié)互助！ 參考文獻(xiàn) 【 1】 程周另外，我還學(xué)會了一些基本軟件的應(yīng)用，比如 STEP 7 MicroWIN 等。自動(dòng)售貨機(jī)可以充分補(bǔ)充人力資源的不足，適應(yīng)消費(fèi)環(huán)境和消費(fèi)模式的變化， 24 小時(shí)無人售貨的系統(tǒng)可以更省力，運(yùn)營時(shí)需要的資本少、面積小，有吸引人們購買好奇心的自身性能，可以很好地解決人工費(fèi)用上升的問題等各項(xiàng)優(yōu)點(diǎn)。在設(shè)計(jì)中我們用到了光電開關(guān)、電磁閥、執(zhí)行機(jī)構(gòu)等我們沒怎么接觸過的電子器件，之前我對這些元器件不是很了解，由于在設(shè)計(jì)中用到了，我查閱了一些資料，對它們的原理以及應(yīng)用有了深刻地認(rèn)識。我們本次設(shè)計(jì)所做的只是 PLC 編程部分，以此實(shí)現(xiàn)它的功能。 第五章 硬件設(shè)計(jì) PLC 外圍接線圖 售貨機(jī)的外部接線圖如圖 所示， SB2— SB7 為物品選擇按鈕，當(dāng)投入貨幣物品綠燈亮（ — ），按下 SB2— SB7 其中一個(gè)，對用的 KM 線圈得電電機(jī)轉(zhuǎn)動(dòng)出相應(yīng)的物品（ — ），當(dāng)有物品銷售完其行程開關(guān)斷開，物品紅燈亮并同時(shí)向總部發(fā)送物品銷售完的信息；當(dāng)收買物品總值低于投入總值時(shí)，可按找零按鈕 SB1 選擇找一元還是五角（ SBSB11）后 KM1 得電電機(jī)轉(zhuǎn)動(dòng)找零 ()。網(wǎng)絡(luò) 33 是兩分鐘無操作計(jì)時(shí)。如在出食品五角，則綠燈閃爍。網(wǎng)絡(luò) 3是當(dāng)余額大于或等于五角時(shí)，如果按下食品五角按鍵，余額減五，并出食品五角，八秒后停止。 自動(dòng)售貨機(jī)設(shè)計(jì)的梯形圖（ LAD） 本此設(shè)計(jì)自動(dòng)售貨機(jī)主要銷售食品 、 飲料 、 日用三大類，而食品有五角和一元，飲料有一元和二元，日用有二元和三元。在梯形圖中引入了“能流”的概念。它與電器控制線路圖相似， 如圖 34所示。順序功能圖由步、轉(zhuǎn)換和動(dòng)作三種主要元件組成，如圖 32 所示。 PLC 通過輸入接口可以檢測被控對象的各種數(shù)據(jù)，以這些數(shù)據(jù)作為 PLC 對被控制對象進(jìn)行控制的