【正文】 浙江工業(yè)大學教科學院 畢業(yè)設計外文資料翻譯 設計 題目： 龍門刨床刨臺運動模擬器的設計 學生姓名： 學 號： 專 業(yè)： 外文出處： Communications in Computer and Information Science, 1, Volume 225, Applied Informatics and Communication, Part 2, Pages 479486 指導教師： 2020 年 2 月 12 日 The Design and Application of Sewage Treatment Automation System Based on S7300 PLC Abstract. For the demand of domestic sewage treatment in countylevel city, a plan of Distributed Control System in municipal wastewater treatment automation system is proposed. The main function of which is to supervisory control each subsystem of municipal wastewater treatment via the configuration software WinCC, Siemens S7300 PLC. The feature of the system is mainly as follows, collection of PLC data, protocol conversion, the transmission of data through fiber, the realization of projects in configuration software, the realtime data storage in database and the release of each kind of report forms, curves, alarm events in display and so on. The idea of the system designation and the detailed characterization of the system are also presented in this paper. Keywords: sewage treatment, Distributed Control System, Siemens S7300 PLC, WinCC Configuration software. 1 Introduction Along with the rapid development of economy in China, environmental protection has been a prominent issue. Sewage Treatment is one of the most important parts of environmental protection. As the puter technology and sewage treatment technology developed rapidly, it is necessary to monitor the wastewater treatment process with advanced control technology and equipment. The sewage treatment project of Inner Mongolian Huhhot Tumd Left Banner is the typical project among the countylevel city of Hohhot, using Cyclic Activated Sludge System (CASS) to treat wastewater. For this project, we designed a DCS system, whose control system is Siemens S7300 PLC and monitoring software is Siemens WinCC . 2 CASS Process CASS biochemical treatment system is a plex system of multiparameter (such as liquid level, water quality, flow rate, pressure, etc.), multitasking (such as waterin, aeration, sedimentation, drainage, etc.), multiequipment (such as water decanter, blower, regulator etc.). It is the core of the whole biochemical disposal system. The main reaction zone of CASS pool works according to “aeration, idle, sedimentation, and decanter” cycle procedures. Among them, the control of dissolved oxygen in CASS pool, anaerobic segment and aerobic segment is the core. 3 The Structure of Control System The structure of automatic sewage treatment control system is centralized management and decentralized control. The control system employs the control method bined with remote automatic control, remote manual control and field automatic control. In order to ensure sewage treatment systems well running, the master station and slave station of PLC are independent. If one of the subsystems breaks down, it will not affect the normal running of other system devices. Even if the whole control system malfunctions, it also can adjust itself to field manual control mode in time to ensure the normal operation of the sewage treatment system. The PC in the central control room uses the model of dualredundant to realize realtime monitoring. Two servers standby each other to jointly perform monitoring tasks. If one server conk out, the other one can undertake the tasks, automatically ensure the system can continue to provide services in the case without manual intervention. 4 Data Communication S7 series PLC munications work mainly includes the following: multipoint interface (MPI) protocol of data muni cations, PROFIBUS, industrial Ether, pointtopoint connections, through ASI process of munication. This project has PROFIBUS, used in industrial Ether, pointtopoint connections. A. The munication between S7300 and WinCC PLC and PC municate with each other through industrial Ether, PLC transmit the data of realtime production to the realtime database of configuration software of PC via optical fiber. PC can monitor the field device from far away. Because the PLC selected in this system is CPU 3152PN/DP, which has integrated PROFINET interface. Communication between S7300 and WINCC uses TCP/IP work protocol. TCP/IP work protocol is a de facto standard about munication protocol in IT services. Although the response time is about 100 ms magnitude, for application of factory control, the response time is enough. B. The Communication between master station and slave station of PLC PLC master station uses Siemens S7300 PLC. The PLC of ClO2 workshop uses Siemens S7200 PLC。 Communication between master station and slave station of PLC uses Profibus. Profibus, is internationalized and open, do not depend on the standard fieldbus of equipment manufacturer. It is a fieldbus which is used for control of factory automation workshoplevel and data munications, and control of field devicelevel. The transmission speed of Profibus is at 9600 bauds ~107 bauds, and when the main system startup, all devices connected to the general line should be set at the same speed. This can achieve the dispersed digital control and scene munications work from field devicelevel to workshoplevel, so as to provide a viable solution for factory to realize the prehensive automation and field device intellectualized. The processor module of Siemens S7300 PLC is CPU 3152 PN/DP, which has its own Profibus interface. The S7300