The sewage treatment project entitled Distributed Control System Design and Application, which is based on human - computer-PLC-field equipment design principles to achieve a control system, the basic construction of the PLC configuration software and remote monitoring at the sewage treatment system, using a network PC, and PLC control. Configuration software refers to the number of data acquisition and process control of special software, they are in the automatic control system for monitoring layer-level software platform and development environment, capable of flexible configuration mode (not programmatically) to provide a good user development interface and simple to use, it addresses the general problem of the control system. PLC is designed for applications in industrial environments designed for digital computing operation of electronic devices. It can be programmed using the memory, used in its internal storage implementation of logical, sequential operation, timing, counting and arithmetic operations, such as operating instructions, and through the digital or analog input and output, control of all types machinery or production processes. So the design process, to improve system reliability, with IPC as the host computer, PLC, as the next crew, the control field device operation. The sewage treatment process in order to achieve automatic control, central monitoring system at the same time and Confluence to communicate, upload the data and issued by the Central Monitoring System for the control command, the control system to achieve the ultimate objective of no or less people on duty, the system treatment greatly increased the level of automation.Sewage treatment is the use of various technologies and means, the pollutants contained in wastewater were removed, recycling, or turning it into harmless substances, the water purification. Modern sewage treatment technology, according to the principle can be divided into physical treatment, chemical treatments and biological treatment categories. Pollutants in urban sewage are diverse, often requires a combination of several methods used to remove different types of pollutants and sludge to achieve the purpose of purification and emission standards. The design is based on activated sludge technology to achieve, activated sludge system in actual operation, the effluent water quality and quantity in constant change, environmental conditions are constantly changing, which requires in accordance with the microorganisms in activated sludge control laws regulate the metabolism, allowing the system to run in the best condition to maximize the benefits and further improve the water quality. According to the system design requirements, the use of "centralized monitoring, decentralized control," the principles of building control systems. With production management and field monitoring level control level network structure, its electrical and automatic control system to Siemens PLC control system ProfiBus backbone network system, while the upper IPC by installing monitoring software to monitor the entire system configuration operating conditions. Sewage treatment plant monitoring system is composed of upper IPC, SIMATICST-300PLC and its network of control modules and ProfiBus high reliability distributed system, the host system through the bus and lower ProfiBus system connection. For the general industrial PC computer. In order to better reflect the operation of equipment, and they were produced in the pool system, the anaerobic pond system, combined pool system, settling tank system decile screen. Screen under the parameter values are based on changes in PLC-bit machines change. Staff through these images at any time the system operating parameters, equipment status, the more limited variety of alarm signals, real-time monitoring, processing, recording and display. The next crew can be on-site sensors, transmitters, automation instruments connected for data communications, data processing and data management. According to process requirements, PLC was correct after the POST, the external transmit signals through sensors, automation instrument input to the PLC, when the circuit is a short circuit, open circuit or overload the motor will stop, also issued to the police. Data processing by PLC, PLC level signals can be decided according to start and stop and the valve switch equipment to water quality-based feedforward - feedback control method, the system can in real time under various conditions and stable Control of water quality. Level, PH value, etc. also use the analog closed-loop control, the formation of multiple control loops. The sewage treatment process are highly logical, valves and level a lot of linkage between the action, will all the valve linkage to determine the relationship and level of action clear, and then use the corresponding control points to form electrical chain, you can implementation process requirements. The PLC controller is responsible for acquiring the distribution of the various sensor signals, in addition to the host computer and sent signals from the host computer for display and control the external control requirements but also according to the implementing agencies on the scene to make the corresponding control, so the sub- PLC station not only has the role of central control, but also has the role of data interchange.
This topic topic is distributed sewage treatment of measurement and control system design and application, it is computer -- -- -- site equipment design of PLC to realize the principle of a measurement and control system, the basic constructs PLC and configuration software in sewage disposal remote monitoring system, the application of PC and PLC networks control. Configuration software refers to some data acquisition and process control of specialized software, they are in the automatic control system monitoring layer level of software platform and development environment, can with flexible configuration mode (not programming style) provide a good development interface and the user use a method, the simplicity of it solves control system general questions. PLC is a specialized in industrial environment application and design of digital computing operations electronic devices. It USES can build programs used in its internal memory, storage to perform the logic operation, order operation, timing, counting and arithmetic operation instruction, and can through digital or analog input and output, the control various types of machinery or production process. So this design process, in order to improve the system reliability, with industrial PC as PC and PLC as the next place machine, control site equipment operation. So as to realize the automatic control wastewater treatment process, at the same time and the function of central control system for communication mixing, upload data and accept the central monitoring system, the control commands issued by the whole control system to reform no or less finally achieved the purpose of unattended operation, this system greatly improve the sewage disposal automation level.
Wastewater treatment is used various technology and method, sewage contain pollutants separation removal, recycling, or transformed into harmless substances, purified water. Modern wastewater treatment technology, according to the principle can be divided into physical treatment method, chemical processing method and biological treatment method with three types. Urban sewage of pollution is varied, often need to adopt the combination of several methods, to remove different nature of the pollutants and sludge, achieve the purpose of purifying and emission standards. The design is based on activated sludge technology to realize, activated sludge system in the actual operation of the water quality and water, sewage in the constant change, environmental conditions in the unceasing change, this needs the microorganism in accordance with the activated sludge metabolic regularity, made the system to adjust control in best operation state, maximum benefit, further improve the effluent. According to the system design requirements, adopt "centralized monitoring, distributed control of the principle of" constructing control system. Using production management monitoring level and on-site control level of network structure, its electric control system to Siemens PLC and ProfiBus network system for control system backbone, and at the same time through installed in upper industrial PC monitoring configuration software to monitor the operation status of the whole system. Sewage treatment plants monitoring system is SIMATICST - by industrial computer, PC and its control module and ProfiBus mill network composition high reliability of the distributed system, superior system through the ProfiBus and lower level system connection. PC for general industrial controlling computer. In order to better reflect the equipment performance, and produced a neutralization pool system respectively, YanYangChi system, combination pool system, traps system picture. Equally Pictures of each parameter values are according to the lower level computer PLC changes. Staff through these pictures can always to the operation of the system parameters, equipment status, the limit of real-time monitoring and alarming signal processing, recording and display,. Lower place machine can and field sensor and transducer, industrial automation instrument is linked together, data communication, data processing and data management. According to the technical requirement, PLC, after having confirmed to electricity self-inspection external signals through the sensor, industrial automation instrument input to PLC, when circuit, open circuit or overload short-circuited when motor will cease, and warning. Through data processing of PLC, PLC according to level signal decision equipment start-stop and valve switch, based in water by feedforward - feedback control method, and makes the system under various working conditions can real-time, stability to control water quality. Level, PH value and so analogue also USES closed-loop control to form multiple control circuit. Sewage treatment process logic is very strong, valves and level there are many chain relations between action, will all have a relationship of the valve and level, and then to determine action relationship with corresponding clearly control can be realized form electrical chain, technological requirements. Each PLC distribution control station is mainly responsible for the collection field of each sensor signal, besides the signal after converting to PC, by PC for display and control according to the on site control requirements to make corresponding control actuator, so each branch net PLC not only has the role of center control, also has the role of data stations.
用谷歌翻译先翻译下。。然后自己看着调整调整。。。我想四级水平就行了。。。再说你搞这研究课题，又不是英文研究课题，翻译成英文后，其他人又有谁会去仔细看呢？？
这题目工程量大，可是悬赏分太低了！
没分~~
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