基于多點網絡的水廠自動監控系統設計Design of MPI Based Automatic Monitoring and Control System in Water Works劉 美 俊(湖南工程學院，湘潭411101)摘要針對水廠工作水泵多、現場離控制站距離遠的特點，提出了一種基于MPI多點網絡的自動監控系統的設計方法，分析了系統的工作原理，介紹了系統中數據的采集與處理、主站與從站的通信原理以及系統軟件的設計。由于這種系統的主、從站PLC之間采用MPI網絡通信，具有運行可靠、性能價格比高的特點，所以適用于中小規模水廠的分布式監控場合。關鍵詞多點網絡主站從站監控系統Abstract Ina ccordancew ithth efe atuersof w aterw orks,i. e. ，manyp umpsin o perationa ndth ep umps， farfor mt hec ontrolst ation,th em ethodo fdesigninga na utomati(〕monitoringa ndc ontorlsy stemb asedo nM PIis p resented.Th eo perationalpr incipleo fth esy stemi san alyzed,th ed atac olection,data processing; communication between master station and slave station as wel as design and system software are discussed. Because MPI network communicationis used among master station, slave stations and PLC, the system is reliable and high COST-efective. It is， suitable for smal and mediumsized water works for distrbuted monitoring and control.Keywords MPI Masterst ation Slaves tation Monitoringa ndc ontorlsy stem
自來 水 廠 的自動控制系統一般分為兩大部分，一對組態硬件要求較高，投資較大。相對而言，MPI網是水源地深水泵的工作控制，一是水廠區變頻恒壓供絡速度可達187.5 M bps，通過一級中繼器傳輸距離可水控制，兩部分的實際距離通常都比較遠。某廠水源達Ikm 。根據水廠的具體情況，確定以MPI方式組地有3臺深井泵給水廠區的蓄水池供水。水廠區的成網絡，主站PLC為S7-300系列的CPU3121FM，從任務是對水池的水進行消毒處理后，通過加壓泵向管站為S7-200系列的CPU222。這樣既滿足了系統要路恒壓供水。選用Siemens公司的S7系列可編程控求，又相對于Profibus網絡節省了三分之一的成本，制器(PLC)和上位機組成實時數據采集和監控系統， 這種分布式監控系統具有較高的性能價格比。系統對深水泵進行遠程控制，對供水泵采用變頻器進行恒中PLC的物理層采用RS - 485接口，網絡延伸選用壓控制以保證整個水廠的電機設備安全、可靠地運帶防雷保護的中繼器，使系統的安全運行得到了保行。證。MPI網絡的拓撲結構如圖1所示。1 多點網絡(NWI)監控系統的組成Sie me ns 公司S7系列PLC通常有MP」多點網絡與Profibus現場總線網絡兩種組網方式。Profibus現場總線的應用目前較為普遍，通用性較好，它由Profibus一DP, Profibus一FMS, Profibus一PA組成。Profibus - DP型用于分散外設間的數據傳輸，傳輸速率為9.6kbps一12Mbps，主要用于現場控制器與分散1/0之間的通信，可滿足交直流調速系統快速響應的時間要求，特別適合于加工自動化領域的應用;Profibus - FMS主要解決車間級通信問題，完成中等傳輸速度的循環或非循環數據交換任務，適用于紡織、樓宇自動化、可編程控制器、低壓開關等;Profibus - PA型采用了OSI模型的物理層和數據鏈路層，適用于過程自動化的總線類型。
The AT89C52 is a low-power, high-performance CMOS 8-bit microcomputer with 8Kbytes of Flash programmable and erasable read only memory (PEROM). The deviceis manufactured using Atmel’s high-density nonvolatile memory technology and iscompatible with the industry-standard 80C51 and 80C52 instruction set and pinout.The on-chip Flash allows the program memory to be reprogrammed in-system or by aconventional nonvolatile memory programmer. By combining a versatile 8-bit CPUwith Flash on a monolithic chip, the Atmel AT89C52 is a powerful microcomputerwhich provides a highly-flexible and COST-effective solution to many embedded controlapplications.
為了擴大監控范圍，提高資源利用率，降低系統成本，提出了一種多通道視頻切換的解決方案。首先從視頻信號分離出行場信號，然后根據行場信號由DSP和FPGA產生控制信號，控制多路視頻通道之間的切換，從而實現讓一個視頻處理器同時監控不同場景。實驗結果表明，該方案可以在視頻監控告警系統中穩定、可靠地實現視頻通道的切換。
Abstract:
To expand the scope of monitoring， improve resource utilization， reduce system COST， a multiple video channels signal switching method is pointed out in this paper. First， horizontal sync signal and field sync signal from the video signal are separated， then control signal according to the sync signal by DSP and FPGA is generated to control the switching between multiple video channels. Thus， it achieves to make a video processor to monitor different place. Experimental results show that the method can realize video channel switching reliably， and is applied in the video monitoring warning system successfully.
As businesses and consumers expect more fromportable electronics, the FPGA industry has beencompelled to re-think how it serves these low-power,COST-sensitive markets. Application classes like
Introduction to Xilinx Packaging Electronic packages are interconnectable housings for semiconductor devices. The major functions of the electronic packages are to provide electrical interconnections between the IC and the board and to efficiently remove heat generated by the device. Feature sizes are constantly shrinking, resulting in increased number of transistors being packed into the device. Today's submicron technology is also enabling large-scale functional integration and system-on-a-chip solutions. In order to keep pace with these new advancements in silicon technologies, semiconductor packages have also evolved to provide improved device functionality and performance. Feature size at the device level is driving package feature sizes down to the design rules of the early transistors. To meet these demands, electronic packages must be flexible to address high pin counts, reduced pitch and form factor requirements. At the same time,packages must be reliable and COST effective.
Abstract: This application note discusses the development and deployment of 3G cellular femtocell base stations. The technicalchallenges for last-mile residential connectivity and adding system capacity in dense urban environments are discussed, with 3Gfemtocell base stations as a COST-effective solution. Maxim's 3GPP TS25.104-compliant transceiver solution is presented along withcomplete radio reference designs such as RD2550. For more information on the RD2550, see reference design 5364, "FemtocellRadio Reference Designs Using the MAX2550–MAX2553 Transceivers."
This application note shows how to achieve low-COST, efficient serial configuration for Spartan FPGA designs. The approachrecommended here takes advantage of unused resources in a design, thereby reducing the COST, part count, memory size,and board space associated with the serial configuration circuitry. As a result, neither processor nor PROM needs to be fullydedicated to performing Spartan configuration.In particular, information is provided on how the idle processing time of an on-board controller can be used to loadconfiguration data from an off-board source. As a result, it is possible to upgrade a Spartan design in the field by sending thebitstream over a network.
WP369可擴展式處理平臺-各種嵌入式系統的理想解決方案 ：Delivering unrivaled levels of system performance,flexibility, scalability, and integration to developers,Xilinx's architecture for a new Extensible Processing Platform is optimized for system power, COST, and size. Based on ARM's dual-core Cortex™-A9 MPCore processors and Xilinx’s 28 nm programmable logic,the Extensible Processing Platform takes a processor-centric approach by defining a comprehensive processor system implemented with standard design methods. This approach provides Software Developers a familiar programming environment within an optimized, full featured,powerful, yet low-COST, low-power processing platform.
FPGAs have changed dramatically since Xilinx first introduced them just 15 years ago. In thepast, FPGA were primarily used for prototyping and lower volume applications; custom ASICswere used for high volume, COST sensitive designs. FPGAs had also been too expensive and tooslow for many applications, let alone for System Level Integration (SLI). Plus, the development
波長信號的解調是實現光纖光柵傳感網絡的關鍵，基于現有的光纖光柵傳感器解調方法，提出一種基于FPGA的雙匹配光纖光柵解調方法，此系統是一種高速率、高精度、低成本的解調系統，并且通過引入雙匹配光柵有效地克服了雙值問題同時擴大了檢測范圍。分析了光纖光柵的測溫原理并給出了該方案軟硬件設計，綜合考慮系統的解調精度和FPGA的處理速度給出了基于拉格朗日的曲線擬合算法。
Abstract:
Sensor is one of the most important application of the fiber grating. Wavelength signal demodulating is the key techniques to carry out fiber grating sensing network， based on several existing methods of fiber grating sensor demodulation inadequate， a two-match fiber grating demodulation method was presented. This system is a high-speed， high precision， low-COST demodulation system. And by introducing a two-match grating effectively overcomes the problem of double value while expands the scope of testing. This paper analyzes the principle of fiber Bragg grating temperature and gives the software and hardware design of the program. Considering the system of demodulation accuracy and processing speed of FPGA，this paper gives the curve fitting algorithm based on Lagrange.
