An electronic-hardware-based oscillogenic controller previously developed by P. K. Mercure was used as a model for translation into a software-based control algoritnm. The oscillogenic instrument, invented by P. R. Rony and P. K. Mercure, uses a feedback element (the oscillogenic controller) and a sensor component to produces a periodic signal yielding information about the instrument's sensor component. A control program that utilized the oscillogenic control algorithm was written in the Turbo Pascal programming language. An IBM PC with 640 kilobytes of read/write memory and with analog-to-digital and digital-to-analog converter boards running the control program performed as the controller component of an oscillogenic instrument. A sample time of 0.5 seconds was used for this study. The instrument's sensor component consisted of a forced air thermal system with air flow rates ranging from 8.4 to 3l kg/hr. The oscillogenic instrument's frequency was, over the limited range tested (0.032 to 0.062 hz), a linear indication of the thermal system's convective heat transfer coefficient, which varied from 230 to 400 W/m²-°C. / Master of Science

A microcomputer-based process controller has been developed to produce porous membrane material. The production process is based on stretching the material in a constant temperature solvent bath. This thesis describes the hardware and software designed to direct and monitor the process. A VIC 20 is used as the process-controlling microcomputer. The system features two dedicated motor controllers and two channels for controlling temperature. The motor controllers determine the material feed rate and rate of stretch. The temperature controllers keep the system at a selectable constant temperature. An interactive assembly language program directs the entire process and monitors the controlled variables. A complete description of the interface and temperature control circuitry is given. The software used to direct the process is also discussed and presented. / Master of Science

A simulator for use in programmable controller ladder logic testing is developed. A simulation language, based on SIMSCRIPT 11.5, to model ladder logic run physical systems is also designed. This System Description Language (SDL) handles simulations of the physical systems and the corresponding ladder-system interactions via the usage of specially designed constructs. The simulation package uses as input an SDL program file describing the system to be simulated, and a ladder file containing the ladder written to control this system. The simulation processor generates the actual simulation from the description contained in the SDL program file. A ladder scanning procedure approximates the actual programmable controller scan as closely as possible. The simulator also incorporates the ability for the user to dynamically interact with, and control the simulation by manipulating ladder inputs from the keyboard. A rolling timing diagram display of a maximum of 7 elements can be created and continuously updated for viewing purposes. System simulations of functionally different manufacturing systems are created and run with their respective ladders on the simulator. Different ladders for the same system are compared for evaluating the performance of the control logic of each ladder. These comparisons are based on the viewing of timing diagrams generated by the ladders. Thus, an off-line ladder logic debugging environment is created. / Master of Science

This thesis presents methodologies for the operation of a programming/documentation system for a Texas Instruments Model 530 programmable controller. The methodologies include: 1) a means to store information about the structure of a ladder diagram and display the ladder diagram on a CRT screen, 2) a means to convert the ladder diagram information into its equivalent Boolean code, and 3) a means to convert Boolean code into its equivalent ladder diagram information. / Master of Science

by Chiu Wai Tak. / Thesis (M.B.A.)--Chinese University of Hong Kong, 1997. / Includes bibliographical references (leaves 54-55). / ABSTRACT --- p.iii / TABLE OF CONTENTS --- p.iv / LIST OF FIGURES AND TABLES --- p.vi / ACKNOWLEDGMENTS --- p.vii / CHAPTER / Chapter I. --- INTRODUCTION --- p.1 / The Microcontroller Market --- p.1 / About National Semiconductor Corporation --- p.3 / Project Objectives --- p.4 / Chapter II. --- METHODOLOGY --- p.7 / Market Research and Data Collection --- p.7 / Literature Review --- p.9 / Chapter III. --- MARKET ENVIRONMENT ANALYSIS --- p.11 / The OTP Microcontroller Market --- p.11 / Customer Profile --- p.16 / Competition Profile --- p.17 / National's Microcontroller Profile --- p.21 / SWOT Analysis --- p.24 / Chapter IV. --- MARKETING STRATEGY --- p.29 / Marketing Objective and Value Proposition --- p.29 / Product Strategy --- p.30 / Pricing Strategy --- p.32 / Distribution Strategy --- p.33 / Promotional Strategy --- p.35 / Chapter V. --- LIMITATIONS --- p.40 / About the Research --- p.40 / About the Marketing Plan --- p.40 / Chapter VI. --- CONCLUSION --- p.42 / Chapter APPENDIX I: --- TYPICAL MICROCONTROLLER APPLICATION --- p.44 / Chapter APPENDIX II: --- EXPERIENCE SURVEY PROCESS --- p.45 / Chapter APPENDIX III: --- REASONS FOR PROJECTS WON AND LOST --- p.46 / Chapter APPENDIX IV: --- BENEFITS OF COP8SA's FEATURES --- p.47 / Chapter APPENDIX V: --- COP8SA PRESS RELEASE --- p.48 / Chapter APPENDIX VI: --- GLOSSARY --- p.52 / BIBLIOGRAPHY --- p.54

Devido às necessidades do mundo moderno, os sistemas de automação têm aumentado sua complexidade, fazendo com que sejam desenvolvidas ferramentas de engenharia cada vez mais poderosas para modelá-los e analisá-los. Em sistemas de automação industrial, os Controladores Lógicos Programáveis (CLPs) têm sido amplamente empregados. Os CLPs são geralmente programados por meio da linguagem de programação Ladder, uma das cinco linguagens definidas pela IEC 61131-3. Entretanto, apesar da linguagem de programação Ladder ser flexível e de fácil aprendizado por parte dos usuários, ela apresenta limitações quanto à: detecção de erros no algoritmo de controle do sistema de automação; torna as modificações muito trabalhosas e não possibilita a simulação, análise de performance e análise operacional do sistema. Este trabalho de pesquisa apresenta o desenvolvimento e os testes da metodologia denominada MARPASI - Metodologia de Aplicação das Redes de Petri em Automação de Sistemas Industriais. Como o desenvolvimento da MARPASI foi efetuado baseado na teoria de Redes de Petri, este trabalho também apresenta uma revisão bibliográfica sobre o tema de aplicação de Redes de Petri para a programação de CLP. A MARPASI possibilita analisar um sistema de automação por meio das Redes de Petri e na geração da linguagem de programação Ladder. Portanto, o emprego da MARPASI contribui para a otimização do processo de engenharia de automação e também para a programação mais eficiente de CLPs. / Due to the needs of the modern world, the systems of automation have increased their complexity, forcing the development of ever more powerful engineering tolls to shape and analyse them. In systems of industrial automation, the Programmable Logic Controllers (PLCs), have been widely applies. The PLCs are generally programmed through the use of the Ladder programming language, one of the five languages defined by the IEC 61131-3. Unfortunately, while the Ladder programming language is flexible, and easily learned by its users, it evinces limitations concerning: error detection in the control algorithm of the automation system: makes modifications very laborious and does not allow any simulation, performance analysis and operational systems analysis. This study presents the development and tests of the methodology denominated as MARPASI - Methodology of the application of Petri Net in the automation of industrial systems. Since the development of MARPASI was made based on Petri Net Theory, this study also presents a bibliographic review about the theme of the application of Petri Net for the programming of PLC. MARPASI makes it possible to analyse a system of automation through Petri Net and in the generation of the Ladder programming language. Because of these, the utilization of MARPASI contributes for capacities, the optimization of automation engineering processes, and also for a more efficient programming of the PLCs.

Este trabalho traça um panorama dos PLCs e tecnologias associadas em momentos anteriores e posteriores à publicação da norma IEC61131-3 e discute aspectos relativos à sua adoção. A aplicação deste norma pode trazer ganhos de produtividade no projeto e implementação de sistemas de automação industrial. Esta dissertação apresenta o caso do "Projeto de modernização dos navios-varredores da Marinha do Brasil" no qual alguns dos conceitos desta norma foram utilizados com sucesso. Ferramentas e metodologias desenvolvidas para adequar o PLC existente a alguns requisitos da norma são descritas ao longo da dissertação. A operação do novo sistema de varredura pode ser verificada através dos resultados experimentais apresentados. / This work presents an overview of the PLC and associated technologies before and after the publication of the IEC61131-3 standard. Some aspects concerning the adoption of this standard are also discussed. The application of this standard can increase productivity in the design and implementation of industrial automation systems. Some concepts of this standard were applied, succesfully, to the modernization of the Brazilian Navy mine-sweepers. Tools and methods that were required in order to adapt the existing PLC to the IEC standard are described. The operation of the newly developed system can be verified by experimental results.

Devido às necessidades do mundo moderno, os sistemas de automação têm aumentado sua complexidade, fazendo com que sejam desenvolvidas ferramentas de engenharia cada vez mais poderosas para modelá-los e analisá-los. Em sistemas de automação industrial, os Controladores Lógicos Programáveis (CLPs) têm sido amplamente empregados. Os CLPs são geralmente programados por meio da linguagem de programação Ladder, uma das cinco linguagens definidas pela IEC 61131-3. Entretanto, apesar da linguagem de programação Ladder ser flexível e de fácil aprendizado por parte dos usuários, ela apresenta limitações quanto à: detecção de erros no algoritmo de controle do sistema de automação; torna as modificações muito trabalhosas e não possibilita a simulação, análise de performance e análise operacional do sistema. Este trabalho de pesquisa apresenta o desenvolvimento e os testes da metodologia denominada MARPASI - Metodologia de Aplicação das Redes de Petri em Automação de Sistemas Industriais. Como o desenvolvimento da MARPASI foi efetuado baseado na teoria de Redes de Petri, este trabalho também apresenta uma revisão bibliográfica sobre o tema de aplicação de Redes de Petri para a programação de CLP. A MARPASI possibilita analisar um sistema de automação por meio das Redes de Petri e na geração da linguagem de programação Ladder. Portanto, o emprego da MARPASI contribui para a otimização do processo de engenharia de automação e também para a programação mais eficiente de CLPs. / Due to the needs of the modern world, the systems of automation have increased their complexity, forcing the development of ever more powerful engineering tolls to shape and analyse them. In systems of industrial automation, the Programmable Logic Controllers (PLCs), have been widely applies. The PLCs are generally programmed through the use of the Ladder programming language, one of the five languages defined by the IEC 61131-3. Unfortunately, while the Ladder programming language is flexible, and easily learned by its users, it evinces limitations concerning: error detection in the control algorithm of the automation system: makes modifications very laborious and does not allow any simulation, performance analysis and operational systems analysis. This study presents the development and tests of the methodology denominated as MARPASI - Methodology of the application of Petri Net in the automation of industrial systems. Since the development of MARPASI was made based on Petri Net Theory, this study also presents a bibliographic review about the theme of the application of Petri Net for the programming of PLC. MARPASI makes it possible to analyse a system of automation through Petri Net and in the generation of the Ladder programming language. Because of these, the utilization of MARPASI contributes for capacities, the optimization of automation engineering processes, and also for a more efficient programming of the PLCs.

Thesis (M.S.)--Ohio University, August, 1999. / Title from PDF t.p.

Thesis (M.S.)--Eastern Illinois University, 2009. / Includes bibliographical references (leaves 58-60).