Tese de mestrado integrado. Engenharia Electrotécnica e de Computadores. Faculdade de Engenharia. Universidade do Porto. 2009

HMS Networks AB develops, produces and sells communication technology for industrial automation. The product handles communication between a variety of protocols. The product treated in this project is an Anybus X-gateway Modbus-TCP Master/Client and this module is currently configured from a web-based interface. In doing so, the flexibility for handling protocols is limited to what the company chooses to add to the interface. Therefore the company had a request that the flexibility should be extended using a script language. The project has mainly consisted of two parts. The first part deals with the implementation of the script language Lua and the second part is about measurement and evaluation of the time required for the script. A prototype was developed with an operational implementation and successful results for data transmission. Although it was a successful project some optimizations are required if this solution is to replace the existing one, because script languages are not as fast as C. Some knowledge in programming and network is required to obtain an adequate understanding of the report.

Made available in DSpace on 2014-12-17T14:08:36Z (GMT). No. of bitstreams: 1 RodrigoEFS_DISSERT.pdf: 3471454 bytes, checksum: 0d90f092b5f26fd304c7c8d8252178a4 (MD5) Previous issue date: 2009-12-22 / The transport of fluids through pipes is used in the oil industry, being the pipelines an important link in the logistics flow of fluids. However, the pipelines suffer deterioration in their walls caused by several factors which may cause loss of fluids to the environment, justifying the investment in techniques and methods of leak detection to minimize fluid loss and environmental damage. This work presents the development of a supervisory module in order to inform to the operator the leakage in the pipeline monitored in the shortest time possible, in order that the operator log procedure that entails the end of the leak. This module is a component of a system designed to detect leaks in oil pipelines using sonic technology, wavelets and neural networks. The plant used in the development and testing of the module presented here was the system of tanks of LAMP, and its LAN, as monitoring network. The proposal consists of, basically, two stages. Initially, assess the performance of the communication infrastructure of the supervisory module. Later, simulate leaks so that the DSP sends information to the supervisory performs the calculation of the location of leaks and indicate to which sensor the leak is closer, and using the system of tanks of LAMP, capture the pressure in the pipeline monitored by piezoresistive sensors, this information being processed by the DSP and sent to the supervisory to be presented to the user in real time / O transporte de fluidos atrav?s de tubula??es ? utilizado na ind?stria petrol?fera, sendo os dutos um elo importante na log?stica de escoamento de fluidos. Por?m, os dutos sofrem deteriora??o em suas paredes ocasionadas por diversos fatores o que pode provocar a perda de fluidos para o meio exterior, justificando o investimento em t?cnicas e m?todos de detec??o de vazamentos para minimizar a perda do fluido e os danos ambientais provocados. Este trabalho apresenta o desenvolvimento de um m?dulo de supervis?o para que seja informado ao operador a ocorr?ncia de vazamento no duto monitorado no menor tempo poss?vel, com o prop?sito que o operador efetue procedimentos que acarretem no fim do vazamento. Esse m?dulo ? um componente de um sistema que visa ? detec??o de vazamento em dutos petrol?feros utilizando tecnologia s?nica, wavelets e redes neurais. A planta utilizada no desenvolvimento e testes do m?dulo aqui apresentado, foi o sistema de tanques do Laborat?rio de Avalia??o de Medi??o em Petr?leo (LAMP), e a sua Local Area Network (LAN), como rede de supervis?o. A proposta consiste, basicamente, de duas etapas. Inicialmente, avaliar o desempenho da infraestrutura de comunica??o do m?dulo de supervis?o. Posteriormente, simular vazamentos para que o DSP (Digital Signal Processor) envie informa??es para o supervis?rio realizar o c?lculo da localiza??o dos vazamentos e indicar a qual sensor o vazamento ? mais pr?ximo, e usando o sistema de tanques do LAMP, capturar a press?o no duto monitorado atrav?s de sensores piezoresistivos, sendo essa informa??o processada pelo DSP e enviada ao supervis?rio para que seja apresentado ao usu?rio dados em tempo real

Made available in DSpace on 2014-12-17T14:08:45Z (GMT). No. of bitstreams: 1 JeffersonDF_DISSERT.pdf: 1592605 bytes, checksum: aa61d131dd2eadfff386030e41f5bd71 (MD5) Previous issue date: 2010-11-22 / The Wireless Sensor Networks (WSN) methods applied to the lifting of oil present as an area with growing demand technical and scientific in view of the optimizations that can be carried forward with existing processes. This dissertation has as main objective to present the development of embedded systems dedicated to a wireless sensor network based on IEEE 802.15.4, which applies the ZigBee protocol, between sensors, actuators and the PLC (Programmable Logic Controller), aiming to solve the present problems in the deployment and maintenance of the physical communication of current elevation oil units based on the method Plunger-Lift. Embedded systems developed for this application will be responsible for acquiring information from sensors and control actuators of the devices present at the well, and also, using the Modbus protocol to make this network becomes transparent to the PLC responsible for controlling the production and delivery information for supervisory SISAL / As Redes de Sensores Sem Fio (RSSF) aplicadas aos m?todos de eleva??o de petr?leo se apresentam como uma ?rea com crescente demanda t?cnico-cient?fica tendo em vista as otimiza??es que podem ser realizadas frente aos processos existentes. Este trabalho tem como principal objetivo apresentar o desenvolvimento de sistemas embarcados dedicados a uma rede de sensores sem fio baseada no padr?o IEEE 802.15.4, onde se aplica o protocolo ZigBee, entre os sensores, atuadores e o CLP (Controlador L?gico Program?vel), visando solucionar os problemas presentes nas fases de implanta??o e manuten??o da comunica??o f?sica atual das unidades de eleva??o de petr?leo baseadas no m?todo Plunger-Lift. Os sistemas embarcados desenvolvidos para essa aplica??o ser?o respons?veis por interpretar as informa??es dos sensores e comandar os atuadores dos dispositivos presentes no po?o, como tamb?m utilizar o protocolo Modbus para fazer com que essa rede se torne transparente para o CLP respons?vel pelo controle da produ??o e envio das informa??es para o supervis?rio SISAL

Made available in DSpace on 2014-12-17T14:55:01Z (GMT). No. of bitstreams: 1 EloiCJ.pdf: 4045636 bytes, checksum: e880bc5df766f908db7bff364ffa3574 (MD5) Previous issue date: 2007-02-15 / This study developed software rotines, in a system made basically from a processor board producer of signs and supervisory, wich main function was correcting the information measured by a turbine gas meter. This correction is based on the use of an intelligent algorithm formed by an artificial neural net. The rotines were implemented in the habitat of the supervisory as well as in the habitat of the DSP and have three main itens: processing, communication and supervision / Este trabalho desenvolveu rotinas de software, em um sistema composto basicamente de placa processadora de sinais (DSP) e supervis?rio, cuja finalidade principal foi corrigir a informa??o medida por um medidor de vaz?o do tipo turbina. Essa corre??o se baseia na utiliza??o de um algoritmo inteligente formado por uma rede neural artificial. As rotinas foram implementadas tanto no ambiente do supervis?rio quanto do DSP e tratam de tr?s ?tens principais: processamento, comunica??o e supervis?o

Made available in DSpace on 2014-12-17T14:55:46Z (GMT). No. of bitstreams: 1 BrunoJC_DISSERT_1-60.pdf: 4138236 bytes, checksum: 7d92583d3159abe9ed3a9cb5f3d51992 (MD5) Previous issue date: 2011-01-31 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Technological evolution of industrial automation systems has been guided by the dillema between flexibilization and confiability on the integration between devices and control supervisory systems. However, there are few supervisory systems whose attributions can also comprehend the teaching of the communication process that happens behind this technological integration, where those which are available are little flexible about accessibility and reach of patterns. On this context, we present the first module of a didactic supervisory system, accessible through Web, applied on the teaching of the main fieldbus protocols. The application owns a module that automatically discovers the network topology being used and allows students and professionals of automation to obtain a more practical knowledgment by exchanging messages with a PLC, allowing those who are involved to know with more details the communication process of an automation supervisory system. By the fact of being available through Web, the system will allow a remote access to the PLC, comprehending a larger number of users. This first module is focused on the Modbus protocol (TCP and RTU/ASCII) / A evolu??o tecnol?gica dos sistemas de automa??o industrial tem sido norteada pelo dilema entre flexibiliza??o e confiabilidade na integra??o entre equipamentos e sistemas supervis?rios de controle. No entanto, s?o poucos os sistemas supervis?rios cujas atribui??es tamb?m abrangem o ensino do processo de comunica??o que ocorre por tr?s dessa integra??o tecnol?gica, sendo os existentes pouco flex?veis no que se refere ao acesso e ? abrang?ncia de padr?es. Este trabalho apresenta um sistema supervis?rio did?tico, acess?vel via Web, que ? utilizado no ensino dos principais protocolos Fieldbus. O aplicativo proposto possui um m?dulo de descoberta autom?tica da topologia da rede usada e permite que alunos e/ou profissionais da ?rea de automa??o obtenham um conhecimento mais pr?tico desses protocolos ao auxiliar na constru??o e envio de quadros pr?prios da rede Fieldbus considerada, propiciando aos envolvidos um conhecimento mais detalhado do processo de comunica??o que ocorre entre um sistema supervis?rio de automa??o e os dispositivos escravos utilizados na rede. Pelo fato de ser uma aplica??o Web, al?m de contemplar o modo de ensino presencial, o sistema proposto permite o acesso remoto ao CLP, comportando um n?mero bem maior de usu?rios e tornando mais abrangente seu universo de aplica??o. Este primeiro m?dulo ? voltado para o protocolo Modbus (abrangendo suas varia??es TCP e Serial RTU/ASCII)

Published Article / A company in South Africa is a three-phase induction motor protection relay manufacturer. The function of the protection relay is to capture running data, to provide protection against possible damage, to control an electric motor and to communicate this data to the System Control and Data Acquisition (SCADA) system in a control room. In the case of remote sites e.g. a pump station, the protection relays are used as standalone units. The protection relays are equipped with communication facilities to be used in an instrumentation environment. If a trip occurs or settings need to be changed a technician has to visit the remote site and address the problem. The ideal cost and time effective solution is to perform these tasks remotely via a reliable wireless network. A study was conducted to ascertain the viability of using the standard GSM cellular networks in South Africa to effectively control electric motors and to communicate with the Motor Protection Relays (MPRs) controlling the electric motors in order to determine the status of a motor, settings of the motor, trips that occurred and time of occurrence. It was shown that a node controller could be used to store all the data from various electric motors at a single location. It was also shown that the data from the different electric motors could be analysed at the node controller and that communication can then be initiated from the controller to a responsible person via the GSM network. It was further illustrated that, by making use of the GSM networks in South Africa together with the short message service (SMS), communication and control can be effectively established. SMSs proved to be a reliable means of communication between cellular phones, an embedded network and MPRs. It was shown that software protocols, although slower in communication speed, proved to be reliable and effective for the purpose of transferring information between the node controller and the motor protection relays connected to the electric motors.

International Telemetering Conference Proceedings / October 22-25, 2001 / Riviera Hotel and Convention Center, Las Vegas, Nevada / This article presents a measurement system based on the RS-485 interface. The presented system is an alternative solution for distributed measurement systems, which cannot be built using IEEE-488 interface due to distance limitation between elements of the system. The RS-485 interface is a base for communication between measurement instruments and uses a Master-Slave protocol to exchange data between them. One dedicated master device, usually a PC, controls all slave devices connected to the interface. To control measurement devices SCPI language is used. This solution simplifies communication between measurement devices and allows utilizing the HP-VEE environment to control any SCPI devices connected to the RS-485 network.

In the field of the industrial automatic control, both MCU (Micro Control Unit) and PLC (Programmable Logic Controller) are widely being used in DCS (Distributed Control System). Since MCU can provide complex process scheduling, accurate timing control and PLC has the advantages of easy programming and maintaining. However, the control programs of the MCU are hard to design and maintain. Identically, the poor signal processing ability, high cost and the restrictive functions are the major defects of PLC. In order to solve the drawbacks described above in MCU and PLC, we provide a PLC-like interface for users to access the devices and set the registers of MCU. Likewise, designers can develop the control program via Event-table-driven modules. On the other hand, our main goal of DCS is to quickly construct the distributed N level network topology based on Modbus protocol, which is efficient and reliable. Therefore, we bring up a data collection method and Slave-to-Slave strategy so as to distribute the master loading, reduce the package transmission times and improve the real-time latency. In conclusion, our research results not only congregate the benefits of MCU and PLC but provide an environment to quickly construct and conveniently monitor DCS, which meets the time-to-market demands.

In conjunction with the possibility of inexpensive wireless communication, many products of tomorrow are developed with the support for wireless communication. The technology enables the possibilty of wireless communication to small plattforms at a realistic price. The cheap connectivity allows for great creativity and gives the developers imagination a wide discretion in the development of new products. This thesis aims to evaluate how the serial communication protocol Modbus RTU - RS232, performs and behaves when transported through meshed networks (Atmel lightweight mesh will be used in this thesis). The work was commissioned by M2M Solutions in J¨onk¨oping. The report will answer the following questions1. How does Modbus RTU behaves when transported through a meshed network. 2. How does Modbus RTU preform when transported through Atmel Lightweight Mesh.The authors have chosen to conduct action research to answer established questions. A test system consisting of both hardware and software was designed and created. With this system, several different tests were conducted and the results were observed and subjected to reflection. The different tests varied the distance, the network’s composition and location of the network infrastructure. Through observation of the test system and evaluation of the recorded data conclusions concering Modbus RTU’s performance and behavior during transport in Atmel lightweigh mesh has been drawn. The test system has been designed with the help of clients and previously made research. Modbus behaves nominally during transportation through Atmel lightweight mesh. Before the network is fully established, an inability to transport data has beend observed. The performance is evaluated by the time it takes to send data, the time is greatly affected by the following factors; Network composition and changes in signal strength (that creates changes in transport routes). For each additional node that traffic is transported through an increase of 5-10ms in the responstime was noted. The network’s ability to change the transport route is also expected to increase performance. The wireless communication provides a longer range than during transportation by standard conventional cable.Considering the results, the authors believe that Modbus RTU has the potential for use in transportation through wireless, meshed networks. One possible scenario is when several Modbus RTU masters are beeing used and data needs to be transported over large distances.