The field programmablelogic devices (FPLDs), which include both field programmable gate arrays (FPGAs) and complex programmablelogic devices (CPLDs), are modern technologies defining the new essential engineering sk...
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The field programmablelogic devices (FPLDs), which include both field programmable gate arrays (FPGAs) and complex programmablelogic devices (CPLDs), are modern technologies defining the new essential engineering skills. Although many commercial programmable device products for high education exist on market, they usually have multiple functionalities and they are expensive for many engineering students. In order to offer students more opportunities to use new technologies in the digital labs or at home, the author designed two low cost CPLD boards during the summer of 2004. The author taught computer engineering and electrical engineering students the art of the logic design using the FPLD technology at the California State University, Sacramento (CSUS). This paper describes the issues related to the integration of the CPLD boards with the Introduction to Digital logic Design course.
Common engineering approaches and modeling approaches from software engineering are brought together. For the domain of process automation an implementation oriented approach for an object oriented software developmen...
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With a properly designed external controller, the series capacitive reactance compensator (SCRC) can be used to damp low frequency power oscillations in a power network. Conventionally, linear control techniques are u...
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programmable logic controllers (PLCs) are type of process control computers, which are small but relatively inexpensive, environmentally hardened, and easy to program, operate, maintain and repair. The process control...
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ISBN:
(纸本)0780394291
programmable logic controllers (PLCs) are type of process control computers, which are small but relatively inexpensive, environmentally hardened, and easy to program, operate, maintain and repair. The process control computers primarily control devices such as motors, solenoids, pumps, valves, lights and heaters etc. These computers, which number in millions, are the control elements in the virtually all modern factory operations. The programmability of PLC allows for fast and easy changes in relay ladder logic to meet the changing needs of the process or driven equipment without the need for expensive and time consuming rewiring. In this paper a target to develop, simulate and implement PLC software for automation of a water treatment plant is achieved. The algorithm developed in this paper may be used to develop PLC based software for any control process.
A novel Digital Controlled Oscillator (DCO) design methodology is presented in this paper. The new design methodology includes a scalable DCO architecture and the developed design flow. With precise analysis in early ...
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In this paper we propose a wideband impulse modulated based system for indoor power line communications (PLC). Impulse modulation is combined with DS-CDMA to allow for user multiplexing. We describe the key system par...
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This paper presents a development of automatic complementary metal-oxidesemiconductor (CMOS) camera inspection system to examine defects. The image capture board based on embedded linux using system-on-a-chip (SoC) an...
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In many industrial processes, an incorrect operation can lead to irreparable damage to people, equipment, or the environment. In order to reduce risks, the electronic control systems used in this kind of processes mus...
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Program execution traces can be so large in practical testing and monitoring applications that it would be very expensive, if not impossible, to store them for detailed analysis. Monitoring execution traces without st...
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Program execution traces can be so large in practical testing and monitoring applications that it would be very expensive, if not impossible, to store them for detailed analysis. Monitoring execution traces without storing them, can be a nontrivial matter for many specification formalisms, because complex formulae may require a considerable amount of information about the past. Metric temporal logic (MTL) is an extension of propositional linear temporal logic with discrete-timebounded temporal operators. In MTL, one can specify time limits within which certain temporal properties must hold, thus making it very suitable to express real-time monitoring requirements. In this paper, we present monitoring algorithms for checking timestamped execution traces against formulae in MTL or certain important sublogics of it. We also present lower bounds for the monitoring problem, showing that the presented algorithms are asymptotically optimal.
The rate of technical advancements in programmablecontrollers has slowed over the past several years. Vendors have consistently followed the trends of smaller, cheaper, and faster. They have pursued alternative archi...
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The rate of technical advancements in programmablecontrollers has slowed over the past several years. Vendors have consistently followed the trends of smaller, cheaper, and faster. They have pursued alternative architectures and repackaging alternatives to redefine solutions to the same problems they have been addressing for the past 30 years. Holonic manufacturing and agent based systems have been suggested to address discontinuities in the manufacturing process. In very few cases, however, have the programmablecontrollers been asked to take on more of the management functions that are usually left to human operators and operation supervisors. This provides an opportunity to integrate judgmental reasoning directly into the programmable Controller where access to information is closer to the real-time environment. By placing judgmental reasoning at the programmable Controller level, the management decisions can be made much more quickly. This paper proposes a subjective decision-making model that can be integrated directly into conventional programmablecontrollers, through the use of a new programming paradigm. It does this without the need to change the controllers themselves. The programmablecontrollers can then take on qualitative judgments such as Safety, Risk, Survival, Profitability, and Asset Management in a manner that can be audited by operations management. Because the manufacturing process requires completely explainable and auditable designs, this approach provides a dynamic graphical language that can be audited. If cognitive capabilities were added to programmablecontrollers, it is very likely that PLCs will suddenly have brand new applications in totally new market areas. Copyright 2005 by ISA.
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