【正文】 cts. Build system application prototype in a short time first, and then, the initial prototype system needs iteration, Always revise and improve until form people preferred the feasibility of subway ticket management system. Key Words： Metro ticketing, PLC, Touch screen, Siemens 目 錄 1 概述 ................................................................................................................................... 1 地鐵自動售票機(jī) ..................................................................................................... 1 觸摸屏 ..................................................................................................................... 1 西門子 PLC .............................................................................................................. 1 設(shè)計目標(biāo)及任務(wù) ..................................................................................................... 2 2 現(xiàn)代觸摸屏技術(shù) ................................................................................................................ 4 觸摸屏概述 ............................................................................................................. 4 表面聲波式觸摸屏 ................................................................................................. 4 基本結(jié)構(gòu) ........................................................................................................ 4 工作原理 ........................................................................................................ 4 主要優(yōu)缺點(diǎn) .................................................................................................... 5 電阻式觸摸屏 ......................................................................................................... 5 基本結(jié)構(gòu) ........................................................................................................ 5 工作原理 ........................................................................................................ 5 主要優(yōu)缺點(diǎn) .................................................................................................... 6 電容式觸摸屏 ......................................................................................................... 6 基本結(jié)構(gòu) ........................................................................................................ 6 工作原理 ........................................................................................................ 6 主要優(yōu)缺點(diǎn) .................................................................................................... 7 紅外線觸摸屏 ......................................................................................................... 7 基本結(jié)構(gòu) ........................................................................................................ 7 工作原理 ........................................................................................................ 7 主要優(yōu)缺點(diǎn) .................................................................................................... 8 觸摸屏的技術(shù)特性 ................................................................................................. 8 透光性能 ........................................................................................................ 8 絕對坐標(biāo)系統(tǒng) ................................................................................................ 8 檢測與定位 .................................................................................................... 8 3 西門子 S7200PLC ............................................................................................................. 9 PLC 概述 ................................................................................................................. 9 可編程序控制器的典型產(chǎn)品 ............................................................................. 9 可編程序控制器的特性 ................................................................................ 9 西門子 PLC 概述 .................................................................................................. 10 西門子 S7200PLC 的主要功能 ........................................................................... 10 西門子 S7200PLC 的硬件系統(tǒng)結(jié)構(gòu) ................................................................... 10 西門子 S7200PLC 的輸入、輸出 ....................................................................... 11 西門子 S7200PLC 掃描周期及工 作方式 ........................................................... 12 西門子 S7200PLC 通信模式 ............................................................................... 13 PPI 協(xié)議 ....................................................................................................... 13 自由口通訊 .................................................................................................. 13 MPI 協(xié)議 ...................................................................................................... 14 PROFIBUS 協(xié)議 .......................................................................................... 14 發(fā)展趨勢 ............................................................................................................... 14 4 本課題程序設(shè)計 .............................................................................................................. 16 方案總體設(shè)計 ....................................................................................................... 16 設(shè)計要求 ...................................................................................................... 16 設(shè)計思路及技術(shù)改進(jìn) .................................................................................. 16 西門子 S7200PLC 的應(yīng)用 ................................................................................... 17 西門子 S7200PLC 運(yùn)算指令的應(yīng)用 ......................................................... 17 西門子 S7200PLC 通訊方式的選擇與設(shè)置 ............................................. 17 TP177B 觸摸屏及其組態(tài)軟件 WinCC flexible 的應(yīng)用 ...................................