【導(dǎo)讀】書而使用過的材料。申請學(xué)位論文與資料若有不實(shí)之處，本人承擔(dān)一切相關(guān)責(zé)任。影印、縮印或其它復(fù)制手段復(fù)制并保存論文；③學(xué)?？稍试S論文被查閱或借閱；文的全部或部分內(nèi)容?？刂蒲b置的作用是識(shí)別、接收和處理分揀信號(hào)，根據(jù)分揀信。別對商品進(jìn)行自動(dòng)分類。這些分揀需求可以通過不同方式，如可通過。判斷，來決定某一種商品該進(jìn)入哪一個(gè)分揀道口。的調(diào)試，驗(yàn)證了包裹分揀功能的要求。

　　

【正文】 o the S7200 so that the program and any operator interfaces have necessary information. Identify any other safetyrelated requirements for safe operation of the process. Specify the Operator Stations Based on the requirements of the functional specifications, create drawings of the operator stations. Include the following items: Overview showing the location of each operator station in relation to the process or machine Mechanical layout of the devices, such as display, switches, and lights, for the operator station Electrical drawings with the associated I/O of the S7200 CPU or expansion module Digital inputs: Each scan cycle begins by reading the current value of the digital inputs and then writing these values to the processimage input register. Analog inputs: The S7200 does not update analog inputs from expansion modules as part of the normal scan cycle unless filtering of analog inputs is enabled. An analog filter is provided to allow you to have a more stable signal. You can enable the analog filter for each analog input point. When analog input filtering is enabled for an analog input, the S7200 updates that analog input once per scan cycle, performs the filtering function, and stores the filtered value internally. The filtered value is then supplied each time your program accesses the analog input. When analog filtering is not enabled, the S7200 reads the value of the analog input from expansion modules each time your program accesses the analog input. Analog inputs AIW0 and AIW2 included on the CPU 224XP are updated every scan with the most recent result from the analogtodigital converter. This converter is an averaging type (sigmadelta) and those values will usually not need software filtering. Tip 北京郵電大學(xué)世紀(jì)學(xué)院畢業(yè)設(shè)計(jì)（論文） 31 Analog input filtering is provided to allow you to have a more stable analog value. Use the analog input filter for applications where the input signal varies slowly with time. If the signal is a highspeed signal, then you should not enable the analog filter. Do not use the analog filter with modules that pass digital information or alarm indications in the analog words. Always disable analog filtering for RTD, Thermocouple, and ASInterface Master modules. Executing the Program During the execution phase of the scan cycle, the S7200 executes your program, starting with the first instruction and proceeding to the end instruction. The immediate I/O instructions give you immediate access to inputs and outputs during the execution of either the program or an interrupt routine. If you use subroutines in your program, the subroutines are stored as part of the program. The subroutines are executed when they are called by the main program, by another subroutine, or by an interrupt routine. Subroutine nesting depth is 8 from the main and 1 from an interrupt routine. If you use interrupts in your program, the interrupt routines that are associated with the interrupt events are stored as part of the program. The interrupt routines are not executed as part of the normal scan cycle, but are executed when the interrupt event occurs (which could be at any point in the scan cycle). Local memory is reserved for each of eleven entities: one main, eight subroutine nesting levels when initiated from the main, one interrupt, and one subroutine nesting level when initiated from an interrupt routine. Local memory has a local scope in that it is available only within its associated program entity, and cannot be accessed by the other program entities. For more information about Local memory, refer to Local Memory Area: L in this chapter. Figure 43 depicts the flow of a typical scan including the Local memory usage and two interrupt events, one during the programexecution phase and another during the 北京郵電大學(xué)世紀(jì)學(xué)院畢業(yè)設(shè)計(jì)（論文） 32 munications phase of the scan cycle. Subroutines are called by the next higher level, and are executed when called. Interrupt routines are not called。 they are a result of an occurrence of the associated interrupt event. 參考文獻(xiàn) 汪冬，魏洪河，譚春琴，郵包自動(dòng)分揀系統(tǒng)的設(shè)計(jì)韓玉民，機(jī) 電工程， 2021年 第 08 期 北京郵電大學(xué)世紀(jì)學(xué)院畢業(yè)設(shè)計(jì)（論文） 33 許勝余，自動(dòng)分揀系統(tǒng)及其應(yīng)用，物流技術(shù)與應(yīng)用， 2021 年 第 03 期 黃啟明，自動(dòng)分揀系統(tǒng)及其應(yīng)用前景分析，物流技術(shù)， 2021 年 第 05 期 李偉 機(jī)床電器與 PLC西安 :西安電子科技大學(xué)出版社， 2021. 謝克明等，《可編程控制器原理與程序設(shè)計(jì)》，電子工業(yè)出版社， 2021 羅宇航，《流行 PLC 實(shí)用程序及設(shè)計(jì)》，西安電子科技大學(xué)出版社， 2021 西門子官網(wǎng) S7— 200 PLC 相關(guān)使用說明 國外郵政技術(shù)資料：包裹傳送和分揀設(shè)備專輯，郵電部郵政科 學(xué)技術(shù)研究所，1973， 6 陳洪蓀等，金屬材料物理性能手冊（ 1），冶金工業(yè)出版社， 1987， 12 張萬忠等，《電器與 PLC 控制技術(shù)》，化學(xué)工業(yè)出版社， 2021 1 郭宗仁等，《可編程控制器應(yīng)用系統(tǒng)設(shè)計(jì)幾通信網(wǎng)絡(luò)技術(shù)》，人民郵電出版社， 2021 1 鐘肇新等 可編程控制器入門教程（ SIMATIC S7200） 廣州 :華南理工出版社， 1999. 1 Lienhard of a micromanipulator based on piezoelectric technology. Deparment of Electrical Engineering and Information of Rostock,D18059 Rostock,Germany ,2021