【正文】 e， and analyzes the frlnction characteristic， the hardware structure， the software environment and the function extension for the dynamic surver control svstem Combining with the application of the electrenic belt balance at home and abroad， it discussed the related theory and the realization method of the survey and centreI technology and the realization method and put the advanced mature frequency conversion velocity modulation technology， the pulse measure technology． touch— screen technology into PLC as one Unit． selects the main cotatrel engine and the system hardwire and designs the dynamic survey Control svstem that taking PLC as the main COntrel engine． SO that it has made the electronic belt balance a better surveying and contr01 perfofinance and the higher value of project practical application Meanwhile， it has also reduced the project expense and enhanced the system cost performance An improve plan has been put forward according to the problems of inconvenient operation and bad real time difierence existing in the original system . Practice proved that the new plan has solved the problems existing in the original system and has a broad spread value． [keywords]electronic belt balance， hardware design， centralized batch， software design 蘭州理工大學(xué)畢業(yè)設(shè)計(jì)說(shuō)明書(shū) 3 目錄 摘 要 .............................................................................................................................................................................. 1 第 1 章 緒論 .............................................................................................................................. 6 皮帶秤及其稱重技術(shù)的概述 .......................................................................................... 7 1． 3 皮帶秤在國(guó)內(nèi)煙草行業(yè)中應(yīng)用及趨勢(shì) ......................................................................... 8 1． 4 本文研究?jī)?nèi)容 ............................................................................................................. 8 第 2 章 系統(tǒng)總體方案設(shè)計(jì) ........................................................................................................ 10 設(shè)計(jì)題目的確定 .......................................................................................................... 10 設(shè)計(jì)題目要求 ................................................................................................... 10 設(shè)計(jì)要求分析 ................................................................................................... 12 系統(tǒng)設(shè)計(jì)的指導(dǎo)思想 ................................................................................................... 13 系統(tǒng)的組成及總體方案設(shè)計(jì) ........................................................................................ 14 硬件配置 ........................................................................................................... 14 軟件設(shè)計(jì) ........................................................................................................... 14 第 3 章 電子皮帶秤稱重原理及誤差分析 .................................................................................. 16 電子皮帶秤稱重原理 ................................................................................................... 16 稱重裝置 ........................................................................................................... 16 稱重系統(tǒng)基本原理 ............................................................................................ 17 皮帶秤工作流程 ................................................................................................ 19 電子皮帶秤的誤差來(lái)源分析 ........................................................................................ 20 稱重誤差 ......................................................................................................... 20 數(shù)據(jù)檢測(cè)與處理誤差 ....................................................................................... 21 環(huán)境誤差 ......................................................................................................... 23 第 4 章 系統(tǒng)硬件設(shè)計(jì) ............................................................................................................... 25 硬件設(shè)計(jì)總體分析 ...................................................................................................... 25 蘭州理工大學(xué)畢業(yè)設(shè)計(jì)說(shuō)明書(shū) 4 雙托輥秤臺(tái)設(shè)計(jì) .......................................................................................................... 26 稱重傳感器的選擇 ...................................................................................................... 27 稱重模塊的選擇 .......................................................................................................... 32 旋轉(zhuǎn)編碼器的選擇 ...................................................................................................... 38 PLC 的選擇 ............................................................................................................... 39 CPU 的選擇 ....................................................................................................... 40 輸入輸出模塊的選擇 ........................................................................................ 41 電源模塊的選擇 ................................................................................................ 42 計(jì)數(shù)器模塊的選擇 ............................................................................................ 42 變頻器的選擇 ................................................................................................... 42 第 5 章 皮帶秤系統(tǒng)軟件設(shè)計(jì) .................................................................................................... 45 西門(mén)子 s7—300 簡(jiǎn)介 ................................................................................................. 45 概述 .................................................................................................................. 45 S7—300 的組成 ............................................................................................. 45 S7—300 的類型 ..........................