【正文】 programming language used ladder diagram language, software changes convenience, versatility and flexibility good.At present, the major PLC programmable controller is a small, lowcost, standardized, highspeed, intelligent, highcapacity, in the direction of the network, and puter technology, formation of industrial control systems, distributed Control Systems DCS (Distributed Control System), fieldbus control system FCS (Field bus Control System), the PLC will enable more powerful, more reliable, more convenient to use, a wider scope. The design is based on the storage of vehicles PLC management systems, LED used two vehicles in the garage to show that the actual number. The use of two light sensor to monitor vehicle access and plete count, the two vehicles entered the house through the sensor and a digital display, two vehicles going through the sensor by a digital display, but only after a sensor vehicles will not count. In order to prevent accidents counting error, the system used repeatedly checking procedures to enhance the reliability of the system. First of all, pay attention to control the distance between the two sensors, access to the garage with the certification procedures for the vehicles, through the sensor when people do not count。使用兩個(gè)光傳感器來(lái)監(jiān)控車(chē)輛的進(jìn)出并完成計(jì)數(shù)工作，車(chē)輛進(jìn)入時(shí)經(jīng)過(guò)兩個(gè)傳感器使顯示數(shù)字加一，車(chē)輛外出時(shí)經(jīng)過(guò)兩個(gè)傳感器使顯示數(shù)字減一，但當(dāng)車(chē)輛只經(jīng)過(guò)一個(gè)傳感器時(shí)不計(jì)數(shù)。作為停車(chē)場(chǎng)本身來(lái)說(shuō)，隨著大型、超大型停車(chē)場(chǎng)的不斷興建，俘車(chē)場(chǎng)需要管理的車(chē)輛數(shù)量越來(lái)越龐大，管理難度加大，如何保證進(jìn)入停車(chē)場(chǎng)的每一輛車(chē)的安全是現(xiàn)代停車(chē)場(chǎng)在安全性方面所面臨的一個(gè)重大考驗(yàn)。國(guó)內(nèi)對(duì)智能停車(chē)場(chǎng)也進(jìn)行了大量的研究，大連理工大學(xué)的寧秋平對(duì)非接觸式IC卡在停車(chē)場(chǎng)管理系統(tǒng)中的應(yīng)用進(jìn)行了設(shè)計(jì)，完善了收費(fèi)系統(tǒng)；北京工業(yè)大學(xué)的王湘斌對(duì)智能停車(chē)場(chǎng)內(nèi)部控制系統(tǒng)的通信進(jìn)行了研究，提出了基于Lon Works現(xiàn)場(chǎng)總線(xiàn)技術(shù)的智能化停車(chē)場(chǎng)控制系統(tǒng)設(shè)計(jì)；哈爾濱工業(yè)大學(xué)的馬鋒對(duì)停車(chē)場(chǎng)在智能交通系統(tǒng)中所應(yīng)起的作用進(jìn)行了分析； 北京理工大學(xué)的李傳軍對(duì)計(jì)算機(jī)視覺(jué)技術(shù)在智能停車(chē)場(chǎng)中的應(yīng)用進(jìn)行了相關(guān)應(yīng)用研究；這些研究都大大豐富和增強(qiáng)了停車(chē)場(chǎng)管理系統(tǒng)的功能。提出技術(shù)先進(jìn)、可靠性好、運(yùn)行效率高的新型停車(chē)場(chǎng)建設(shè)方案。允許瞬時(shí)停電在10ms以下，能繼續(xù)工作。但是在快速響應(yīng)系統(tǒng)中就會(huì)造成響應(yīng)滯后現(xiàn)象，這個(gè)一般PLC都會(huì)采取高速模塊。出庫(kù)車(chē)輛前進(jìn)時(shí)經(jīng)過(guò)4 → 3傳感器后計(jì)數(shù)器減1，單經(jīng)過(guò)一個(gè)傳感器則計(jì)數(shù)器不動(dòng)作。圖36電動(dòng)機(jī)電路控制圖4 PLC的I/O接線(xiàn)圖下圖41為停車(chē)場(chǎng)控制系統(tǒng)的接線(xiàn)圖，在該接線(xiàn)圖中，SBl是該系統(tǒng)的總開(kāi)關(guān)， ，, ，XX2是行程開(kāi)關(guān)，、Ll是停車(chē)場(chǎng)車(chē)滿(mǎn)指示燈，L2是車(chē)未滿(mǎn)指示燈， QS是電機(jī)正轉(zhuǎn)的總開(kāi)關(guān)，KM1是電機(jī)正轉(zhuǎn)的繼電器線(xiàn)圈，KM2是電機(jī)反轉(zhuǎn)的繼電器線(xiàn)圈，直接接入七段數(shù)字譯