【正文】 s service life, therefore, time use inductive load the selective relay working life must be long. (4) The PLC output load possibly has the disturbance, must therefore take the measure to control, if directcurrent output39。s load short circuit, will burn down the print circuit wafer, therefore, application fuse protection output element. (3)Uses when the relay outputs, withstands inductive load39。s ties cable should lie alone, prevents the outside signal the disturbance. (5) The exchange output line and the directcurrent output line do not use the identical root electric cable, the output line to be far away from the high tension line and the power line as far as possible, avoids parallel. Third, I/O end wiring 1. Input wiring (1) inputs the wiring not to surpass 30 meters generally. But if the environment disturbance is small, when the loss of voltage is not big, the input wiring may suitable long. (2)Inputs/the output line not to be able to use the identical root electric cable, the input/output line to be separated. (3)Uses the normally opened contact form to connect the input end as far as possible, causes the establishment the trapezoidal chart to be consistent with the relay schematic diagram, is advantageous for reading. 2. Outgoing junction (1) The output wiring divides into the independent output and the public output. In not group, may use the different type and the voltage class output 41 voltage. But can only use the identical type, the identical voltage class power source in the identical group39。 (8) Maintenance must be placed after the template installed in place Second, installment and wiring 40 (1) The power line, the pilot wire as well as the PLC power line and the I/O line should distinguish the wiring, between the insulating transformer and PLC and I/O should use the double rubberized wire connection. (2) PLC should be far away from the strong jamming source like electric welding machine, the high efficiency silicon rectifier unit and the largescale power equipment, cannot install with the highpressured electric appliance in the identical switch cabi. (3) The input and output of PLC are best separate the line, the switch quantity and the simulation quantity must separate the placing. The simulation quantity signal39。 (6) pluggable template, to be more careful, gently, and the goods shipped out of static electricity。 (4) before removing RAM modules, check the battery module is working correctly, if the battery fault light is removed when the PAM module content will be lost。 (3) RAM module to remove or insert the CPU from the CPU prior to disconnect the PC39。 (6) installed in reverse order。 (4) connected to the power supply rack power cord clear line number in mind and remove the link location, then remove the power rack and rack screws connected, power rack can be removed。 (2) the way the CPU on the front panel select switch from the Run to stop position。 (3) maintenance scheduling and operator contact before and well, be linked to overhaul licensing office hung maintenance card。 three maintenance preparation, maintenance of order (1) ready before maintenance tools。 Second, the provisions of cleaning equipment on a regular basis (1) every six months or a quarter of the PLC to clean, cut off power to the PLC power supply to the power rack, CPU board and input / output board i n turn be removed to purge, clean and then in turn installed in situ, will all link to resume evacuation call and start the host PLC. PLC box carefully sweeping health。在此，我祝各位老師工作順利，生活美滿！ 37 參考文獻 [1]李道霖 .電氣控制與 PLC 原理及應用 [M].電子工業(yè)出版社 , [2] 孫海維 .SIMATIC 可 編 程 控 制 器 及 應 用 [M].機 械 工 業(yè) 出 版社 , [3]廖常初 .可編程控制應用技術(shù) [M].重慶大學出版社 , [4]馮立明 .電鍍工藝與設備化學 [M].北京工業(yè)出版社 , [5]孫平 .可編程控制器原理及應用 [M].高等教育出版社 , [6] 常 曉 玲．電氣控制系統(tǒng)與可編程控制器．北京：機械工業(yè)出版社， 2021 [7] 黃 北 剛．工廠電氣控制電路實 例詳解． 北京：化學工業(yè)出版社， [8] 方 承 遠．工廠電氣控制技術(shù)．北京：機械工業(yè)出版社， 2021 [9] 田 瑞 庭 .可編程控制器應用技術(shù) .北京：機械工業(yè)出版社，1994 [10] 廖常初主編 .PLC 編程及飲用 .北京：機械工業(yè)出版社， 2021 [11] 西門子公司 . S7200 可編程控制器系統(tǒng)手冊， 2021 [12] 西門子公司 . S7200 可編程控制器產(chǎn)品目錄， 2021 [13] 北 京 亞 控 自動化軟件科技有限公司．“組態(tài)王”使用手冊， 2021 [14] 汪志鋒 .可 編程控制器原理和應用 .西安：西安電子科技大學出版社， 2021 [15] 汪曉平 . PLC 可編程控制器系統(tǒng)開發(fā)實例導航 .北京：人民郵電出版社， 2021 [16] 張萬忠 .可編程控制器應用技術(shù) .北京：化學工業(yè)出版社， [17] 周美蘭等 . PLC 電氣控制與組態(tài)設計 .北京：科學出版社， 2021 [18] 李道林主編 .電氣控制與 PLC 原理及應用 .北京：電子出版社，2021 [19] 李長久 . PLC 原理及應用 .北京：機械工業(yè)出版社， [20] 周美蘭等 . PLC 電氣控制與組態(tài)設計 .北京 ：科學出版社， 2021 38 外文資料譯文 PLC question PLC which should pay attention in the application is specially the control device which serves for the industrial production, usually does not need to take any measure, may use directly in the industry environment. But, w hen the production environment is too bad, the electromagic interference is special intense, or installs uses improper, cannot guarantee PLC the normal operation, therefore should pay attention to the following question in the use. First, Siemens PLC maintenance 1, maintenance procedures, equipment, periodic testing, adjustment provisions (1) halfyearly or quarterly inspection PLC cabi terminal connections, and if time to reloose strong local connection。 在設計的過程中我們遇到了很多困難，有很多問題通過我們的教科書是解決不了的，但是我們一方面可以通過導師的指點，找出問題的所在，所以我們能夠成 功完成設計有很大一部分通過導師的指導；另一方面我們可以通過學校的借書條件，從學校的圖書館獲得我們想要的資料，因此我們也要感謝學校能給我們提供這樣自我解決問題的平臺；同時，我們能夠運用我們的專業(yè)知識，在設計當中我們能夠充分運用我們的專業(yè)知識，這都是我們在這三年里所有專業(yè)老師的細心教導。當然在以后的類似設計當中我們將會盡量的達到這些要求。 但是在編寫的過程中我們還是遇到了很多問題，這樣的系統(tǒng)如果能夠?qū)嶋H驗證的話會很到程度上提高我們的動手能力。 PLC 的編程是我們整個設計最主要的一部分，我們的編程是采用梯形圖編程語言，所有的編寫步驟和編寫要點是嚴格按照課本要求和教科老師的指導來編寫的，所以整個編寫的過程是相當嚴謹?shù)摹? 在該組成員的極力配合下，該電鍍生產(chǎn)線控制系統(tǒng)的設計基本完成，在設計當中我們充分考慮到了操作的方便性，元件的實惠性和工藝的簡單性。并使其成為現(xiàn)代表面工程技術(shù)的重要組成部分。 圖 初始狀態(tài) 按動“連續(xù)運行”按鈕，再按“啟動按鈕”，系統(tǒng)向上運行，如圖 示： 33 圖 按動上限開關(guān)，系統(tǒng)向右運行，如圖 ： 圖