【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。使用兩個光傳感器來監(jiān)控車輛的進出并完成計數(shù)工作，車輛進入時經(jīng)過兩個傳感器使顯示數(shù)字加一，車輛外出時經(jīng)過兩個傳感器使顯示數(shù)字減一，但當車輛只經(jīng)過一個傳感器時不計數(shù)。作為停車場本身來說，隨著大型、超大型停車場的不斷興建，俘車場需要管理的車輛數(shù)量越來越龐大，管理難度加大，如何保證進入停車場的每一輛車的安全是現(xiàn)代停車場在安全性方面所面臨的一個重大考驗。國內(nèi)對智能停車場也進行了大量的研究，大連理工大學的寧秋平對非接觸式IC卡在停車場管理系統(tǒng)中的應(yīng)用進行了設(shè)計，完善了收費系統(tǒng)；北京工業(yè)大學的王湘斌對智能停車場內(nèi)部控制系統(tǒng)的通信進行了研究，提出了基于Lon Works現(xiàn)場總線技術(shù)的智能化停車場控制系統(tǒng)設(shè)計；哈爾濱工業(yè)大學的馬鋒對停車場在智能交通系統(tǒng)中所應(yīng)起的作用進行了分析； 北京理工大學的李傳軍對計算機視覺技術(shù)在智能停車場中的應(yīng)用進行了相關(guān)應(yīng)用研究；這些研究都大大豐富和增強了停車場管理系統(tǒng)的功能。提出技術(shù)先進、可靠性好、運行效率高的新型停車場建設(shè)方案。允許瞬時停電在10ms以下，能繼續(xù)工作。但是在快速響應(yīng)系統(tǒng)中就會造成響應(yīng)滯后現(xiàn)象，這個一般PLC都會采取高速模塊。出庫車輛前進時經(jīng)過4 → 3傳感器后計數(shù)器減1，單經(jīng)過一個傳感器則計數(shù)器不動作。圖36電動機電路控制圖4 PLC的I/O接線圖下圖41為停車場控制系統(tǒng)的接線圖，在該接線圖中，SBl是該系統(tǒng)的總開關(guān)， ，, ，XX2是行程開關(guān)，、Ll是停車場車滿指示燈，L2是車未滿指示燈， QS是電機正轉(zhuǎn)的總開關(guān)，KM1是電機正轉(zhuǎn)的繼電器線圈，KM2是電機反轉(zhuǎn)的繼電器線圈，直接接入七段數(shù)字譯