【正文】 s in laboratories is efficiency extra usage of the laboratory funds. 基于 PLC 的教育教學材料的虛擬實驗系統(tǒng)的研究 摘要： 本文提出的虛擬模型虛擬實驗系統(tǒng)，這是受雇于在教育過程中的可編程邏輯控制器（ PLC）編程。遠程手動控制，可以人為控制的設備的啟動 /停止，遠程自動控制可自動調節(jié)設備的狀態(tài)，通過對現(xiàn)場的變化參數。 6）日志管理：記錄的信息，以便為用戶登錄和注銷搜索針對不同用戶的使用間隔。它提供了多種司機為 PLC，使 PLC 與 PC 的連接更容易和在 STEP7 中配置的變量列表可以是我們教育署直接與 WinCC 連接時。轉換也擴展的方式來解決問題，如地址，路由路徑及錯誤檢測在特定的網絡。電源設備提供了 RS485 半雙工異步串行通信接口通信，并采用 MODBUS RTU 通訊協(xié)議。這是一個用于控制工廠的現(xiàn)場總線自動化車間級和數據通信，并控制現(xiàn)場設備級。 PC 可以監(jiān)視現(xiàn)場設備從很遠的地方。如果一個子系統(tǒng)發(fā)生故障，也不會影響其他系統(tǒng)設備的正常運行。 于這個項目，我們設計的 DCS系統(tǒng)，其控制系統(tǒng)采用西門子 S7300 PLC 的監(jiān)控軟件是西門子 。 Signal Module, Function Module, Interface Module, Communications Processor, Power Module and Programming Module. The PLC system of the project contains three racks, the main rack municated with Expansion rack by IM360/361. The Phase I of Sewage Treatment Phase has 23 analog input points, 3 analog output points, 222 digital input points and 68 digital output points. In this PLC hardware configuration, 15% of all reserve margins is set aside, which is leaved for the phase II. The S7300 PLC system hardware diagram is shown in Figure 3. 6 Composition of PC Conitoring System This paper takes the Chinese version WinCC as systematic configuration software to realize the configuration function of superv ision appearance. It provides a variety of drivers for PLC, which makes the connection of PLC and PC much easier and the variable list configured in STEP7 can be us ed directly when connected with WinCC. The functional block diagram for PC monitor system is shown in Figure 4. “ PC monitoring system” functional description: 1) Control function : to realize the realtime control of the online device in the main control room, such as equipments start/stop, analog output regulation, PLC operating parameters setting online, etc. 2) Display function : to show the running state of the device being controlled via the graphics and animation, and display the realtime operating parameters of the field device. 3) Archive management: to set up a production database and save the original data of the production for calculation and analys is, according to the change speed, the importance of operating parameters, the r ealtime and historical running state. 4) Alarm function: to realize different alarm grades according to different needs, when an analog value (such as current, pressure, water level, concentration, etc.) measured exceed the given range, or a digital value (such as motor start/stop, valves on/off) is out of order. 5) Print function : to realize the realtime print of reports, graphics, various events and alarm. The print way can be divided into timed print, event trigger print and userdefined print. 6) Log management: to record the information for users to log in and out, in order to search the use interval for different users. 7) Rights management: to set corresponding visit protection for different users, and prevent the users unauthorized to visit the monitor system. 7 PLC Control Program The system uses modular design to realize the program of PLC system via the STEP7 software. The program flow chart is shown in Figure 5. The control system adopts modularization program, and falls into 10 subprogram according to the workshop in the whole techni cal procedures. In the main program, it can call each subprogram in proper order. First, writting an analog acquisition subprogram in the orgnization block 35, and the analog data will be refreshed every 100 millisecond. Then, the control program which is classified as remote manual control and remote auto control can switch through the bit flags between the two ways. Remote manual control can artificially control the devices start/stop, and remote auto control can automatically adjust the state of the device by the change of onthespot parameters. So the program can execute automatically and timely for every cycle, and all the devices can autostop to control when there are cascading failures. Modbus uses multisite polling mode to municate with power meters. 8 Conclusions The automation system used in the sewage treatment is worthy of popularization, for it can meet the requirements of modern sewage treatment, reduce the daytoday maintenance management, decrease the cost of sewage treatment, and ensure the operation and water quality of effluent. With the development of engineering technology, the automation system in the sewage treatment plant will surely show its obvious advantages. The project was tested in . The result turned out that the system is an advanced, reliable and simply operated control system, which can better resolve some problems such as low automation, low reliability and large time delay and some other exist problems in the past sewage treatment. 基于 S7300 PLC 的污水處理自動化系統(tǒng)的設計與應用 摘要 . 在縣級城市生活污水處理的需求，集散控制系統(tǒng)在城市污水處理自動化系統(tǒng)的計劃提出的。本文還提出了系統(tǒng)的系統(tǒng)名稱和詳細描述的想法。 CASS池主反應區(qū)的工程，按照 “ 曝氣，閑置，沉淀，和潷水器 “ 的循環(huán)過程。兩臺服務器的待機彼此共同執(zhí)行監(jiān)測任務。 TCP/ IP 網絡協(xié)議，是事實上的 IT 標準有關通信協(xié)議服務。處理器西門子 S7300 PLC 模塊， CPU 3152 PN / DP的，它有其自己的 PROFIBUS 接口。MODBUS 網絡可以連接多個上一條線，每個設備的設備可以設置通訊地址本身。 該項目的 PLC 系統(tǒng)包含三個 機架 ，主要機架與擴展機架 IM360/361 傳達。 2）顯示功能：顯示設備的運行狀態(tài)，通過控制圖形和動畫，顯示該領域的實時運行參數設備。程序流程圖如圖 5 所示。 8 結論 在污水處理中使用的自動化系統(tǒng)是值得推廣的，因為它能滿足現(xiàn)代污水處理的要求，減少日常的一天維護管理，降低污水處理成本，并確保運行和出水的水質。在年底，實驗室設備的遠程連接的可能性進行了討論。幸運的是其中一些可以解決的 PLC 仿真 軟件。但客戶有購買相應的模擬器同 一制造商生產的軟件產品，以獲得 PLC 的實時實驗的所有功能和選項。 虛擬 PLC 和虛擬環(huán)境中有連接實際 PLC 的弱點系統(tǒng)。 2 虛擬實驗系統(tǒng)概述 在本文中，虛擬實驗系統(tǒng)實現(xiàn)一個真正的 PLCSCADA 軟件。一些植物的二維模型對組態(tài)軟件的開發(fā)。二維模型是建立由組態(tài) 軟件的圖形設計師。數學建模創(chuàng)造了一種植物的數學表示的過程。溫度的變化入口流量是在這個過程中的主要干擾源。這種模式有助于塑造學生的感性認識過程控制的理解。 [2] Communications in Computer and Information Science, 1, Volume 216, Advances in Computer Science, Environment, Ecoinformatics, and Education, Pages 552556