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检索条件"主题词=Programmable Logic Controllers"

共 1744 条记录，以下是691-700 订阅

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Edit Distance Based Instruction Merging Technique to Improve Flexibility of Custom Instructions Toward Flexible Accelerator Design

Edit Distance Based Instruction Merging Technique to Improve...

引用

19th Asia and South Pacific Design Automation Conference (ASP-DAC)

作者： Huang, Hui Kim, Taemin Hoskote, Yatin Univ Calif Los Angeles Dept Comp Sci Los Angeles CA 90095 USA Intel Corp Intel Labs Hillsboro OR 97124 USA

ISBN: (纸本)9781479928163

Due to ever shortening time-to-market of a system-on-a-chip (SoC) and increasing NRE cost of designing accelerators in the SoC, a design methodology for a flexible accelerator is desirable. We propose a novel technique to make custom instructions (CIs) of an application specific instruction-set processor (ASIP) flexible. By doing so, CIs can support applications that were not considered at design time of the ASIP, which is difficult to do with a conventional CI design method. We have shown that custom instructions generated by our technique can support future applications by up to 7X better than those from a conventional method.

关键词： programmable logic controllers

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Smart Plugs: a Low Cost Solution for programmable Control of Domestic Loads

Smart Plugs: a Low Cost Solution for Programmable Control of...

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AEIT Annual Conference

作者： Galioto, Giovanni Galioto, Natale Giaconia, Costantino Giarre, Laura Neglia, Giovanni Tinnirello, Ilenia Univ Palermo Dept Elect Engn I-90133 Palermo Italy INRIA Maestro Project Sophia Antipolis France

ISBN: (纸本)9788887237245

Balancing energy demand and production is becoming a more and more challenging task for energy utilities. This is due to a number of different reasons among which the larger penetration of renewable energies which are more difficult to predict and the meagre availability of financial resources to upgrade the existing power grid. While the traditional solution is to dynamically adapt energy production to follow the time-varying demand, a new trend is to drive the demand itself by means of Direct Load Control (DLC). In this paper we consider a scenario where DLC functionalities are deployed at a large set of small deferrable energy loads, like appliances of residential users. The required additional intelligence and communication capabilities may be introduced through smart plugs, without the need to replace older "dumb" appliances. Smart plugs are inserted between the appliances plugs and the power sockets and directly connected to the Internet. An open software architecture allows to abstract the hardware sensors and actuators integrated in the plug and to easily program different load control applications.

关键词： load regulation programmable controllers smart power grids DLC direct load control domestic loads energy demand balancing energy production hardware sensors open software architecture power sockets programmable control smart plugs time-varying demand Home appliances Load flow control logic gates Plugs Power demand Sensors Servers programmable control load control plugs Smart grids load flow control programmable logic controllers plugs Power demand Power production Appliances logic gates Servers Sensors Software architecture discotic liquid crystals

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The future of industrial automation and IEC 614993 standard 3

The future of industrial automation and IEC 614993 standard

引用

2014 3rd International Congress of Engineering Mechatronics and Automation, CIIMA 2014

作者： Cruz Salazar, Luis A. Rojas Alvarado, Oscar A. University Foundation Technological of Comfenalco FUTCO Cartagena Colombia University of Cauca UNICAUCA Popayán Colombia

ISBN: (纸本)9781479979325

The design of Automation and Control Systems shows a consolidated tendency towards what has been called Distributed Intelligence. This concept has proven to be appropriate to meet the current requirements imposed on production systems, aimed at optimizing the agility to respond to disturbances and productive environment;and enhance the reconfigurability of control systems and processes. Within the theoretical conceptions of the emergent Intelligent Automation, such as Agents, the Holonic Systems, Fractal Manufacturing stand above the rest. The theoretical concept should lead to availability of technological tools that enable its implementation. According to the previous idea, the IEC 61499 standard has been established approaches from intelligent distributed components. This comes as standard programming method that will surely pass the current forms of algorithm design for programmable logic controllers, whose languages are normalized by traditional IEC 61131-3. This paper aims to show how the recent standard is compatible with the adoption of new paradigms of automation, and illustrate the concepts of distributed intelligence and autonomy that could be implemented through algorithms with new structures of Function Blocks, compiled on some programmable controllers such as PLC. © 2014 IEEE.

关键词： programmable logic controllers

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Program-based and model-based PLC design environment for multicore FPGA architectures 11

Program-based and model-based PLC design environment for mul...

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11th International Conference on Informatics in Control, Automation and Robotics, ICINCO 2014

作者： Economakos, Christoforos Skarpetis, Michael Economakos, George Technological Educational Institution of Sterea Ellada Department of Automation Engineering Psahna EviaGR34400 Greece National Technical University of Athens School of Electrical and Computer Engineering Microprocessors and Digital Systems Laboratory Heroon Polytechniou 9 Zografou AthensGR15780 Greece

ISBN: (纸本)9789897580390

Digital design has been growing rapidly during the last years, offering advanced implementation solutions for a diversity of appliances and instruments, integrating different sensors and actuators. This has a great impact on embedded automation, where traditional programmable logic controllers (PLCs) have been gradually replaced by high performance Embedded controllers, Digital Signal Processor (DSP) chips and, more recently, power efficient Field programmable Gate Arrays (FPGAs). Such new implementation platforms bring together efficient design methodologies, like model-based design and high-level or C level program-based design. In their turn, new design methodologies are accompanied by new design technologies like Intellectual Property (IP) based design and High-Level Synthesis (HLS). This paper presents a design environment that utilizes program-based and model-based design, for the development of PLC applications. Specifically, a tool flow is constructed that supports either the design of new control algorithms or the translation of existing algorithms into C. Then, HLS and FPGA implementation tools are adopted, to implement the selected algorithms as mul-ticore, embedded designs, offering performance improvements and hardware utilization efficiency. Overall, the proposed methodology and underlying tool flow support a novel high productivity prototyping platform for digital control applications, with very promising future extension capabilities.

关键词： programmable logic controllers

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Development of a laboratory-scaled mass rapid transit system

Development of a laboratory-scaled mass rapid transit system

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2014 IEEE Student Conference on Research and Development, SCOReD 2014

作者： Chew, Yoong Sen Mohd-Mokhtar, Rosmiwati School of Electrical and Electronic Engineering Universiti Sains Malaysia Engineering Campus Nibong Tebal Pulau Pinang14300 Malaysia

ISBN: (纸本)9781479964284

Mass rapid transit (MRT) technology had gone through a very comprehensive and intensive evolution in recent decades. Those developments and innovations occurred in both technological and engineering aspects. In this project, a laboratory-scaled mass rapid transit system based on programmable logic Controller (PLC) is built. The motivation of this project is to design and develop a laboratory scaled mass rapid transit system that can demonstrate the operation of a real MRT system to the public. Omron CJ2M series PLC, Shihlin Electric Human-machine-interface EU200 series, Lego 7938 City Train Set and Arduino microcontroller board are used to develop the system. Several NPN sensors are implemented in the system to perform the automated operation of a real MRT system. Other devices such as servo motor, light-emitting diode and DC motor are used to support the primary function of the rail system. In addition, simulation software in controlling the operation of an MRT system is also developed. The outcome has significantly contributed towards in depth knowledge and practical understanding of mechatronic system development and implementation. © 2014 IEEE.

关键词： programmable logic controllers

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CryPLH: Protecting smart energy systems from targeted attacks with a PLC honeypot 1

引用

2nd International Workshop on Smart Grid Security, SmartGridSec 2014

作者： Buza, Dàniel Istvàn Juhàsz, Ferenc Miru, György Fèlegyhàzi, Màrk Holczer, Tamàs Budapest Hungary

ISBN: (数字)9783319103297

ISBN: (纸本)9783319103280

Smart grids consist of suppliers, consumers, and other parts. The main suppliers are normally supervised by industrial control systems. These systems rely on programmable logic controllers (PLCs) to control industrial processes and communicate with the supervisory system. Until recently, industrial operators relied on the assumption that these PLCs are isolated from the online world and hence cannot be the target of attacks. Recent events, such as the infamous Stuxnet attack [15] directed the attention of the security and control system community to the vulnerabilities of control system elements, such as PLCs. In this paper, we design and implement the Crysys PLC honeypot (CryPLH) system to detect targeted attacks against industrial control systems. This PLC honeypot can be implemented as part of a larger security monitoring system. Our honeypot implementation improves upon existing solutions in several aspects: most importantly in level of interaction and ease of configuration. Results of an evaluation show that our honeypot is largely indistinguishable from a real device from the attacker’s perspective. As a collateral of our analysis, we were able to identify some security issues in the real PLC device we tested and implemented specific firewall rules to protect the device from targeted attacks. © Springer International Publishing Switzerland 2014.

关键词： programmable logic controllers

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Integration of supervisory control with SCADA system for a flexible manufacturing cell 12

Integration of supervisory control with SCADA system for a f...

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12th IEEE International Conference on Industrial Informatics, INDIN 2014

作者： Beatriz Portilla, Nicole De Queiroz, Max H. Cury, José E. Project Engineering Department Ingeniería Avanzada de Colombia Ltda Bogotá Colombia Departamento de Automação e Sistemas Universidade Federal de Santa Catarina Florianópolis Brazil

ISBN: (纸本)9781479949052

This paper presents the integrated development of a SCADA system with the PLC code of supervisory control for a flexible manufacturing cell. A local modular approach of the Supervisory Control Theory is used for formal synthesis of optimal discrete-event systems supervisors, which are translated into PLC structured text code as a hierarchy of concurrent automata. The SCADA system provides a human-machine interface with complementary functionalities to the control system such as synoptic diagrams, high-level commands, historical reports, alarms, trends, recipes and interface to management systems. The control system design follows a methodology with several phases, including informational project, synthesis of supervisory control, emulation, implementation of PLC code, implementation of SCADA system and validation. The test bed application shows that, in addition to providing PLC supervisory control with valuable high-level functionalities, SCADA systems can take advantage of the automata based organization of modular supervisory control for a systematic, flexible and structured design. © 2014 IEEE.

关键词： programmable logic controllers

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Application of programmable logic Controller in Sewage Treatment

Application of Programmable Logic Controller in Sewage Treat...

引用

2nd International Conference on Advanced Composite Materials and Manufacturing Engineering, CMME 2014

作者： Zhang, Zi Sheng Liu, Bo Feng Guo, Shu Qing Song, Deng Yuan Wang, Zhan You College of Physics Science and Technology Hebei University Baoding China Yingli Group Co.Ltd Baoding China

ISBN: (纸本)9783038350651

In order to seek a better way of control in sewage treatment, a control system which consisted of water unit, sand unit, the oxidation ditch unit, precipitation unit and sludge dewatering unit was designed. The paper investigates various controllable parameters in sewage treatment system and the way of present common automation control. We designed manual control variable aeration program and two automatic control subroutine which included thickness grille and pumping station by using WIN 32 software. The program is designed in Siemens STEP 7 V5.5 software development platform and chose the 10 input contacts which are I0.0~I0.7, I1.0~I1.1 and 10 output contact which are Q1.0~Q1.1, Q0.0~*** design achieves automatic control and improves the purifying efficiency on the premise of ensuring water quality. © (2014) Trans Tech Publications, Switzerland.

关键词： programmable logic controllers

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Design of a PLC-based engineering training unit

Design of a PLC-based engineering training unit

引用

Annual International Conference on Intelligent Materials and Nanomaterials, AIMN 2014

作者： Han, Jian Bing Hebei Technology University Shijiazhuang Hebei China

ISBN: (纸本)9783038351573

The handling unit based on PLC is composed of seven motors, programmable logic Controller, touch panel, sensor and so on, The unit controls the bucket to move up and down, left and right with seven motors, and back and forth and regulates the speed of motor movement with speed regulators, complete the material transport, the touch panel help realize the manual and full-automatic control of motor and the switching between manual and automatic modes. The handling unit based on PLC for strengthening the operating ability in college or junior technical personnel are of great help. © (2014) Trans Tech Publications, Switzerland.

关键词： programmable logic controllers

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Software changes in factory automation: Towards automatic change based regression testing

Software changes in factory automation: Towards automatic ch...

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作者： Ulewicz, Sebastian Schutz, Daniel Vogel-Heuser, Birgit Institute of Automation and Information Systems Technische Universität München Munich Germany

ISBN: (纸本)9781479940325

Changes of software in factory automation are frequent and resource-consuming in quality assurance when proving compliance with functional specifications. Automated testing can help minimizing required resources for software engineering. However, changes in the software cause a need for re-evaluating functionality through tests. To reduce resource consumption, existing relevant tests can be re-executed after ensuring their compatibility with the software after the changes. In this paper, an approach for enabling the automatic identification and classification of changes is presented, which can be used to efficiently select existing and help adapting incompatible test cases, leading to an overall increase in test efficiency. The approach is based on a detailed programmable logic Controller (PLC) program library and code analysis (both in IEC 61131-3) for several types of machines of industrial companies from the domain of factory automation. © 2014 IEEE.

关键词： programmable logic controllers

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