基于西門子plc交通燈論文設(shè)計-文庫吧資料
2024-11-18 02:35本頁面
【正文】 ，可以驅(qū)動相應的執(zhí)行器。 CPU 在每個掃描周期的開始掃描輸入模塊的信號狀態(tài)，并將其狀態(tài)送入到輸入映像寄存器區(qū)域； CPU 根據(jù)用戶程序中的程序指令來處理傳感器信號，并將其處理的結(jié)果送到輸出映像寄存器 。 PLC 輸入模塊的輸入信號狀態(tài)與傳感器信號相對應，為傳感器信號經(jīng)過隔離和濾波后的有效信號。這些模塊可以按照一定的規(guī)則組合配置?！? PLC 的工作原理 PLC 實質(zhì)上是一種專用與工業(yè)控制的計算機，其硬件結(jié)構(gòu)基本上與微型計算機相近，在結(jié)構(gòu)上分為固定式和組合式（模塊式）兩種，固定式 PLC 包括 CPU板， I/O 板，顯示面板，內(nèi)存塊，電源等，這些元素組合成一個不可拆卸的整體。它能夠存儲和執(zhí)行命令，進行邏輯運算、順序控制、定時、計數(shù)和算術(shù)運算等操作，并通過數(shù)字式和模擬式的輸入、輸出，控制各種類型的機械或生產(chǎn)過程。國際電工委員會（ IEC）曾于 1982 年 11 月頒布了可編程控制器標準草案第一稿， 1985 年 1 月發(fā)表了第二稿， 1987 年 2 月又頒布了第三稿。但是為了與個人計算機 PC（ Personal Computer）相區(qū)別，長將可編程控制器仍成 為 PLC。進入 20 世紀 80 年代后，采用了 16 位和少數(shù) 32 位微處理器構(gòu)成 PLC，使得可編程邏輯控制器在概念、設(shè)計、性能上都有了新的突破。 關(guān)鍵詞 交通燈控制系統(tǒng)；可編程控制器（ PLC）；十字路口；科學化管理；穩(wěn)定性；可靠性 3 ABSTRACT The traditional traffic control system is mostly by digital circuit, traffic control system stability reliability and antiinterference ability is bad, With the development of society and economy, and digital circuit traffic lights to meet the growing traffic pressure, therefore, must seek a new method to replace the plex and working stability of the control system. With the development of science and technology, the programmable logic controller (PLC) function, the programmable controller has, as a kind of microputer technology as the core in automatic control equipment, has been widely used in mechanical manufacturing, metallurgy, chemical, energy, etc. It has high reliability, plete functions, strong antijamming capability, with simple structure, light weight, it is a kind of process control for industrial environment and the number of operating system. PLC control traffic lights, mainly is for use with the consideration of the characteristics of strong adaptability to environment, and its internal timer resources are very rich, but for now the widespread use of progressive light accurately control, particularly easily realize more control of the crossroads. Because of PLC work munication function, has the same path can be posed of a LAN for signal unified dispatching management, can shorten the time of waiting vehicles, scientific management. In actual application of PLC control, urban traffic lights, can according to different conditions, modified at any time to change control procedures, the signal of working time and working conditions. And relay or logic circuit control system, PLC control system has higher reliability and flexibility and economic and practical. This paper is the application of the principle of PLC to control the traffic intersection, introduced in traffic system based on PLC is introduced, and the application of PLC system of basic principle.
環(huán)評公示相關(guān)推薦
鄂ICP備17016276號-1