【正文】 于制造業(yè)中，特別是電器制造、汽車制造、塑料加工、通用機械制造及金屬加工等工業(yè)。使用 PLC 的自動控制系統(tǒng)具有體積小，可靠高，故障率低，動作精度高等優(yōu)點。 控制裝置的作用是接收和處理分揀信號，根據(jù)分揀信號的要求進行自動分類。s prehensive national strength. and put forward higher requirements for performance, life and reliability of the bearing industry, bearing the quality depends on the design, manufacturing and testing process. The key factors affecting the quality of roller is error roller diameter. In the strength in production for measuring amount is larger, there is error in reading the manual measurement. A PLC control roller diameter sorting system in this paper, through mechanical transmission, sensing and measuring method of roller automatic detection and sorting, sorting efficiency is increased in improving measurement accuracy at the same time. This design through the push rod roller is pushed to the limit block, tungsten probe diameter measurement error, the resulting signals are converted to electrical signals by the analog processing module amplification circuit into PLC,then open the corresponding electromagic turning plate, the push rod roller into the separating box different In the material box with oil substances,The buffer used in roller falling process, to ensure the precision roller. Through simulation software to learn, the design scheme is feasible, Can be used to measure the diameter and the sorting roller, through this system can not only save the cost but also can improve the sorting efficiency, there is a good market prospect. Key Words: PLC precision measurement Roller sorting 西南科技大學 畢業(yè)設(shè)計（論文） III 目 次 1 緒論 ............................................................................................................................................ 1 2 工藝方案設(shè)計及要求 ................................................................................................................ 3 2． 1 系統(tǒng)控制要求 ...................................................................................................................... 3 2． 2 任務(wù)分析 .............................................................................................................................. 5 2． 3 相敏檢波 .............................................................................................................................. 5 2． 4 控制系統(tǒng)的選型 .................................................................................................................. 6 2． 5 西門子可編程控制器模塊連接 .......................................................................................... 8 2． 6 S7300/400 系列可編程控制器（ PLC）的工作過程 ....................................................... 8 3 硬件、軟件選擇 ........................................................................................................................ 9 3． 1 PLC 模塊選型 ...................................................................................................................... 9 3． 2 計數(shù)模塊和比較模塊 .......................................................................................................... 11 3． 3 傳感器選型 ........................................................................................................................ 12 3． 4 電磁閥的選型 .................................................................................................................... 15 3． 5 STEP 7................................................................................................................................ 17 4 硬件設(shè)計 .................................................................................................................................. 18 4． 1 系統(tǒng)配置及資源分配 ........................................................................................................ 18 4． 2 系統(tǒng)端子接線 .................................................................................................................... 19 5 模擬量的輸入標定 .................................................................................................................. 20 5． 1 模擬量的處理 .................................................................................................................... 20 5． 2 模擬量模塊量程設(shè)定 ........................................................................................................ 21 5． 3 模擬量輸入值的規(guī)范化 FC105 ........................................................................................ 23 6 軟件設(shè)計 .................................................................................................................................. 24 6． 1 PLC 程序設(shè)計基本步驟 .................................................................................................... 24 6． 2 程序結(jié)構(gòu)類型 .................................................................................................................... 24 6． 3 程序結(jié)構(gòu) ............................................................................................................................ 25 7 程序安裝、調(diào)試、運行 .......................................................................................................... 27 7． 1 程序下載 ............................................................................................................................ 27 7． 2 設(shè)置調(diào)試變量 .................................................................................................................... 28 7． 3 程 序調(diào)試步驟 ...................................................................................................................... 28 結(jié)論 ................................................................................................................................................ 30 致謝 ................................................................................................................................................ 31 西南科技大學 畢業(yè)設(shè)計（論文） IV 參考文獻 ...................................................................