【正文】 simple operation and convenient and reliable performance, programming flexibility, small volume and the use of life is very long, some of the been greatly improved in reliability, the hardware equipment failure rate is reduced, the more important is to realize the intelligent control, according to the actual need to change the release time parameters, reasonably determine the time difference between the intersection traffic signal, and day and night modes for and rapid time to adjust, so that the control system has bee more convenient and flexible, effective relationship vehicle waiting time, greatly improve the utilization rate of the crossroads, the progressive realization of the scientific management. Such an intelligent traffic control system is very important for the construction of the city modernization. Keywords: Traffic accident； PLC； Traffic lights； Intelligent； Control Systems 鹽城工學(xué)院本科生畢業(yè)設(shè)計說明書（ 2020） 目 錄 概論 ...............................................................................................................................1 交通燈的發(fā)展與研究意義 ...................................................................................1 當(dāng)前國內(nèi)外的交通現(xiàn)狀 .......................................................................................1 課題設(shè)計內(nèi)容 .......................................................................................................2 PLC 簡介 .......................................................................................................................3 PLC 的組成 ...........................................................................................................3 PLC 的硬件系統(tǒng)組成 ................................................................................3 PLC 的軟件系統(tǒng)組成 ................................................................................5 PLC 的工作原理 ...................................................................................................5 PLC 的工作方式 ........................................................................................5 PLC 的工作過程和特點 ............................................................................6 PLC 的編程語言 ...................................................................................................7 編程語言的特點 .......................................................................................7 編程語言的形式 .......................................................................................8 PLC 的掃描周期和響應(yīng)時間 ...............................................................................8 PLC 的 I/O 響應(yīng)時間 .................................................................................8 PLC 工作方式帶來的特殊性 ....................................................................8 系統(tǒng)硬件設(shè)計 ...............................................................................................................9 硬件系統(tǒng)組成 .......................................................................................................9 I/O 地址分配 .........................................................................................................9 PLC 選型 .............................................................................................................10 時間顯示模塊 ....................................................................................................10 交通燈時間控制模塊 .........................................................................................10 系統(tǒng)軟件設(shè)計 ............................................................................................................. 11 編程軟件簡介 ..................................................................................................... 11 三菱編程軟件 .......................................................................................... 11 PLC 編程軟件 GX Developer 的使用概述 ............................................ 11 系統(tǒng)的工作原理 .................................................................................................13 功能流程圖 ........................................................................................................14 .....................................................................................15 梯形圖設(shè)計 .........................................................................................................16 狀態(tài)轉(zhuǎn)移圖 ..............................................................................................16 數(shù)碼管顯示程序 .....................................................................................17 計時程序 .................................................................................................17 亮燈時間預(yù)置程序 .................................................................................18 鹽城工學(xué)院本科生畢業(yè)設(shè)計說明書（ 2020） 系統(tǒng)仿真與調(diào)試 .........................................................................................................19 仿真系統(tǒng)硬件接線 .............................................................................................19 系統(tǒng)程序調(diào)試 .....................................................................................................20 程序調(diào)試過程中遇到的問題 ............................................................................22 結(jié)束語 .......................................................................................................................23 參考文獻(xiàn) ...........................................................................................................................24 致 謝 ...........................................................................................................................25 附 錄 ..................