車輛論文出入庫-wenkub
2023-07-11 00:51:15 本頁面
【正文】 l, not only saving human resources, but a large degree of improved production efficiency, further promote the rapid development of productive forces, and constant enrich people39。使用兩個(gè)光傳感器來監(jiān)控車輛的進(jìn)出并完成計(jì)數(shù)工作，車輛進(jìn)入時(shí)經(jīng)過兩個(gè)傳感器使顯示數(shù)字加一，車輛外出時(shí)經(jīng)過兩個(gè)傳感器使顯示數(shù)字減一，但當(dāng)車輛只經(jīng)過一個(gè)傳感器時(shí)不計(jì)數(shù)。早期的自動(dòng)控制系統(tǒng)是依靠繼電接觸器來實(shí)現(xiàn)的，其特點(diǎn)是：結(jié)構(gòu)簡(jiǎn)單、價(jià)格低廉、抗干擾能力強(qiáng)，可以實(shí)現(xiàn)集中控制和遠(yuǎn)距離控制，但是其采用固定接線，通用性和靈活性差；又采用觸點(diǎn)的開關(guān)動(dòng)作，工作頻率低，觸點(diǎn)易損壞，可靠性差。1969年，出現(xiàn)了可編程邏輯控制器PLC（Programmable Logic Controller），其特點(diǎn)是：具備邏輯控制、定時(shí)、計(jì)數(shù)等功能，編程語言采用直觀的梯形圖語言，軟件更改方便，通用性和靈活性好。為了防止意外計(jì)數(shù)錯(cuò)誤，本系統(tǒng)采用反復(fù)程序校驗(yàn)，來提高系統(tǒng)的可靠性。s lives. Early automatic control system relies on the relay Contactor to achieve, and its features are: simple structure, low cost, antiinterference capability, can achieve centralized control and remote control, but the introduction of fixed wiring, versatile and flexible of the poor and by the switch contacts, the low frequency contacts easily damaged, poor reliability.1969, a programmable logic controller PLC (Programmable Logic Controller), its features are: a logic control, timing, counting, and other functions, intuitive 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
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