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IEEE International Conference on Control Applications

作者： Afzalian, A. Noorbakhsh, M. Nabavi, S. A. Shahid Abbaspour Univ Technol Tehran Iran Univ Mazandaran Dept Elect Engn Babol Iran

ISBN: (纸本)9781424422227

The paper discusses synthesis and physical implementation of decentralized supervisory controller of the Dynamic Flow controller (DFC) as a discrete-event system. The local plants have been used for synthesizing of decentralized supervisory controller for easier implementation of overall control system. A heuristic method is developed for easier implementation of the supervisor on a programmable-logic-controller (PLC), to overcome the implementation problems in the auto/manual mode of DFC operation. A step-by-step procedure is developed to generate a ladder diagram which implements the DES supervisory control on a PLC. The proposed approach for implementation of modular controllers can be used to implement any modular supervisory control in practice.

关键词： Discrete Event system Dynamic Flow controller programmable logic controller Supervisory Control Theory

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Ladder Diagram Generation Using Generic Model of Discrete Event System

Ladder Diagram Generation Using Generic Model of Discrete Ev...

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7th IEEE International Conference on Cybernetic Intelligent Systems

作者： Choi, Sung-Wook Lee, Kang-Gu Koo, Lock-Jo Park, Chang-Mok Park, Sang-Chul Wang, Gi-Nam Ajou Univ Dept Ind Engn Suwon 441749 South Korea

ISBN: (纸本)9781424429141

This paper describes plant modeling using DES (discrete event system) in generic model, and designing the controller for PLC-based manufacturing system. The tested model through simulation can be automatically transformed into LD (Ladder Diagram) program analyzing the controller elements. In addition, through the simulation of devices and controllers, possible logical errors can be minimized. The contribution of this work is to generate small and medium sized PLC-programs and reduce down-time and ramp-up time.

关键词： Discrete event systems programmable logic controller LD Auto generation Plant-controller model

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Research on technique of real-time communication between programmable logic controller and microcomputer

Research on technique of real-time communication between pro...

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International Conference on Communications, Circuits and Systems

作者： Lin, L Wang, H Univ Elect Sci & Technol China Sch Automat Engn Chengdu 610054 Peoples R China

ISBN: (纸本)0780386477

When PLC (programmable logic controller) and microcomputer communicate in real-time system, the technique of real-time communication between PLC and microcomputer will be used in many areas. This paper research technique and solve the real-time communication problem between PLC and microcomputer. The usage of OMRON PLC and C++ program language, and use the example of real-time communication between PLC and microcomputer in control protecting system of microwave transmitter to illuminate the basic means and technique in real-time system design and communication software design, including the core technique of real-time communication. The practical using proves the validity and the value of this technology.

关键词： programmable logic controller program design real-time communication communication test

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Safety verification of material handling systems driven by programmable logic controller - Consideration of physical behavior of plants

Safety verification of material handling systems driven by p...

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16th Workshop on Circuits and Systems

作者： Konaka, E Suzuki, T Okuma, S Nagoya Univ Grad Sch Engn Nagoya Aichi 4648603 Japan

The PLC (programmable logic controller) has been widely used in the industrial world as a controller for manufacturing systems, as a process controller and so on. The conventional PLC has been designed and verified as a pure Discrete Event System (DES) by using an abstract model of a controlled plant. In verifying the PLC, however, it is also important to take into account the physical behavior (e.g. dynamics, shape of objects) of the controlled plant in order to guarantee such important factors as safety. This paper presents a new verification technique for the PLC-based control system, which takes into account these physical behaviors, based on a Hybrid Dynamical System (HDS) framework. The other key idea described in the paper is the introduction of the concept of signed distance which not only measures the distance between two objects but also checks whether two objects interfere with each other. The developed idea is applied to illustrative material handling problems, and its usefulness is demonstrated.

关键词： programmable logic controller safety verification hybrid dynamical system

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Improving efficiency of existing water distribution networks by centralized monitoring

Improving efficiency of existing water distribution networks...

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3rd International Conference on Information and Automation for Sustainability

作者： Jayasekara, P. G. Illangasinghe, D. K. Dahanayake, J. K. Wickramage, K. Munasinghe, Rohan Univ Moratuwa Dept Elect & Telecommun Engn Moratuwa Sri Lanka

ISBN: (纸本)9781424418992

The optimum distribution of treated pipe-borne water is a critical requirement in countries which have a deficit production in comparison with the demand. However, in 3rd world countries, it is not feasible to design the entire water distribution network as a whole, to enable near-optimized delivery, do(! to economic constraints. The current practice in such countries is to operate the nodes of the water distribution network, such as pump houses and water towers, in isolation, based on ad hoc criteria. Improper co-ordination of these nodes leads to wastage and inefficiencies in the utilization of the scarce resource of treated water. Hence the challenge lies in improving the water distribution process via a network that has not been inherently designed to support optimum distribution. The proposed system presents a solution to this predicament by centrally monitoring and controlling the functionality of these points of distribution. It is a low cost, locally developed system which can replace the PLC based automation systems currently deployed, simultaneously providing the additional functionality of remote control. It is operable in 3 interchangeable modes: Manual, Auto and Remote. The Remote Mode, which is a novel feature unavailable in the existing system, enables a central server to monitor the operation of the total network and issue supervisory commands to regulate the functionality or even to take over the control of a remote pump house, if necessary. It also facilitates the centralization of skilled labor.

关键词： programmable logic controller (PLC) remote monitoring remote supervision centralized control programmable logic controller

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Design and PLC based implementation of supervisory control for under-load tap-changing transformers

Design and PLC based implementation of supervisory control f...

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International Conference on Control, Automation and Systems

作者： Noorbakhsh, M. Afkalian, A. Shahid Abbaspour Univ Technol Dept Control Syst Engn Tehran Iran

ISBN: (纸本)9788995003879

Discrete-event systems (DES) can be found as an essential integrated subsystem in electrical power systems. The continuous trajectory of the system state can be interrupted by discrete control actions and uncontrolled disturbances. Under-load tap-changing transformers (ULTC) which obviously have discrete-event behavior are widely used in transmission systems to take care of instantaneous variations in the load conditions in substations. The paper discusses synthesis and physical implementation of a DES supervisory control for ULTC system. It is shown that the specifications are controllable and the closed loop control system is non-blocking. We used a heuristic method for easier implementation of the supervisor on a Programma le-logic-controller (PLC), to overcome the general implementation problems as well as, the implementation problem caused by the auto/manual mode of ULTC operation. A step -by- step procedure is developed to generate a ladder diagram which implements the DES supervisor on a PLC.

关键词： supervisory control theory ULTC programmable logic controller

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Cutting control system with variable scale and high precision for auto silicon steel sheet cutter

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Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery 2007年第3期38卷 144-147页

作者： Zhang, Shuguang Wang, Fushun Sun, Xiaohua Shao, Limin Wang, Xiwang Agricultural University of Hebei China Hebei Software Institute China

A FX2 PLC as master control unit combined with a MR-J2 servo motor, an orientation module and a servo amplifier to make a system. A motor was accurately controlled by using the features of position control and multistage velocity control of the servo motor through the form address orientation method and an optimization project of dual control for position and velocity was deduced. The duel control project ensures both the precision and the speed of the system. The system realized variable scale cutting, which met the requirement of special transformer. The operating tests indicated that of the cutter satisfied the technical specifications completely.

关键词： Cutter Multistage velocity control Position control programmable logic controller Variable scale cutting

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EVALUATION OF UML IN PROCESS AUTOMATION – RESULTS OF AN EXPERIMENTAL APPROACH -

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IFAC Proceedings Volumes 2007年第16期40卷 269-274页

作者： David Friedrich Dorothea Pantfoerder Birgit Vogel-Heuser Embedded Systems Department of Computer Science and Electrical Engineering University of Kassel 34121 Kassel Germany

This paper reports on a series of lab experiments to evaluate the application of modelling notations in automation and control engineering. The focus of this evaluation was on two aspects: 1) analyzing and modelling the problem or application and 2) implementing its solution into a control program in IEC 61131-3. The evaluated notations are the Unified Modeling Language (UML) and the Idiomatic Control Language (ICL): UML as nearly standard in computer science and ICL as powerful modelling notation from the distributed control systems world (DCS).

关键词： Cognitive science control engineering human-machine interface knowledge acquisition knowledge representation programmable logic controller process automation process model programming support systems engineering

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TOWARDS A FRAMEWORK FOR INTEGRATED SUPERVISORY AND logic CONTROL

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IFAC Proceedings Volumes 2007年第6期40卷 187-192页

作者： Knut AARkesson Markus Sköldstam Department of Signals and Systems Chalmers University of Technology SE-412 96 Gothenburg Sweden

An architecture for integrated supervisory and logic control is presented together with a modeling formalism, Extended Finite Automata (EFA). It is argued that the architecture and modeling formalism may be used to efficiently represent many control programs formulated with sequential function charts and ladder logic. Since EFA is an extension to finite automata, EFA is also useful for modeling traditional supervisory control problems. With a small example it is argued that the presented architecture together with the EFA formalism can be used to efficiently verify and synthesize control functions that contain both supervisory control and traditional logic control.

关键词： Discrete Event Systems Supervisory Control programmable logic controller Modeling

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RECONFIGURABLE MODULES, programmable logic controller, AND VISION SYSTEM FOR DUAL ROBOT ASSEMBLY WORKCELL DESIGN

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Journal of Advanced Manufacturing Systems 2003年第2期2卷 201-228页

作者： SHENG-JEN HSIEH Department of Engineering Technology and Industrial Distribution Texas A&M University College Station Texas 77843 USA

Robot workcell system design involves integrating one or more robots with components such as conveyors, pallets, machine tools, and fixtures. Previous work in workcell design has addressed control and operations management issues such as scheduling. There has been relatively little emphasis on overall design, interface, system integration and agility issues. This paper provides a detailed technical description of (1) a cost-effective approach to prototyping a robotic assembly workcell using off-the-shelf modules and sensors; and (2) the process of designing, building, and integrating a dual robot assembly cell using a programmable logic controller. Modules and sensors used include pneumatic devices, solenoids, Hall effect and optical sensors, relays, optical isolators, conveyor, programmable logic controller, and vision system. Ladder diagrams, vision system inspection tools, and an integration interface were developed to synchronize the sequence of operations and communication between hardware devices. A design framework for web-based control of the system is proposed. Future research directions include web-based monitoring, control, and troubleshooting.

关键词： programmable logic controller machine vision systems robot workcell system design web-based control virtual laboratory manufacturing automation and control

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