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Timing analysis and a modified PID control algorithm of the fieldbus control system

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 2004年第9期37卷 1105-1116页

作者： Pang, YB Nishitani, H Beijing Univ Chem Technol Sch Informat Sci & Technol Beijing 100029 Peoples R China Nara Inst Sci & Technol Grad Sch Informat Sci Ikoma Nara 6300192 Japan

The fieldbus control system (FCS) has been increasingly used in the process control area. This paper first shows the timing analysis of the fieldbus control loop by considering both communication and control tasks at the same time. As a result, the fieldbus control loop time was formulated, and the stability condition of the loop operation was represented with the loop time in the FCS. Then a modified PID control algorithm that is suitable for fieldbus devices was proposed to overcome varying communication delays. Finally, a fieldbus control loop was modeled and simulated to validate the timing analysis and the control algorithm. The simulation results showed that the control algorithm works well for the common processes having a first-order model with dead time and the stability of the fieldbus control loop can be assured under the unpredictable and varying time delays caused by the fieldbus.

关键词： fieldbus control system control loop time timing analysis control algorithm control stability

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Synchronous control in the fieldbus control system of open-width desizing range

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Huazhong Ligong Daxue Xuebao/Journal Huazhong (Central China) University of Science and Technology 2001年第5期29卷 57-59页

作者： Zhou, C. Xu, L. Liu, Z. Yu, Y. Dept. of Control Sci./Eng. HUST Wuhan 430074 China

On the basis of the introduction of open-width desizing range, the design and its hardware of the fieldbus control system are given based on three kinds of intelligent nodes. The theory of synchronization feedback device is introduced, and the theory and the realization of the range are proposed. The problem of engineering realization is discussed and the solution is proposed.

关键词： fieldbus control system Intelligentnode Open-width desizing range Synchronous control

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Integrated current-time characteristic measurement system for multichannel positive temperature coefficient thermistors

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MEASUREMENT SCIENCE AND TECHNOLOGY 2011年第4期22卷 045903-1-045903-8页

作者： Hu, Binxin Li, Buyin Liu, Ming Huazhong Univ Sci & Technol Dept Elect Sci & Technol Wuhan 430074 Peoples R China

The current-time characteristic plays a crucial role in assessing the actual working performance of a positive temperature coefficient (PTC) thermistor. However, the existing measurement instruments have serious limitations and hardly adapt to the actual production. This paper presents a state-of-the-art measurement system for the current-time characteristic of the PTC thermistor. Multiple updated measurement methods, including pulsed dry circuit testing, RMS digital computation, oversampling and decimation, are proposed to design this system. Several advanced techniques, specifically CAN bus, mixed signal SoC and VI, are introduced to implement this system. As a result, high accuracy class 0.1 is achieved. The current dynamic range is extended to 10(4). The efficiency is increased by more than 12 times. In short, this highly integrated and cost-effective system reaches commercial grade for actual production. The practical application demonstrates that this system is quite suitable for batch production.

关键词： PTC thermistor current-time characteristic integrated measurement system fieldbus control system

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A Novel Real-time Fuzzy Adaptive Auto-Tuning Scheme for Cascade PID controllers

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INTERNATIONAL JOURNAL OF control AUTOMATION AND systemS 2011年第5期9卷 823-833页

作者： Fadaei, Ali Salahshoor, Karim Petr Univ Technol Dept Automat & Instrumentat Tehran Iran Petr Univ Technol Tehran Fac Petr Tehran Iran

This paper presents a novel fuzzy auto-tuning methodology to continuously adapt PID control actions without interrupting the normal process operation. New auto-tuning rules are introduced to schedule a gradual and guided activation of each individual P, I and D control mode in three adjustable functional control zones. An auto-scaling procedure has been incorporated to generalize the autotuning scheme to efficiently respond to any set-point change outside a pre-defined operating span. In contrast to existing auto-tuning algorithms, the proposed scheme is not an on-demand auto-tuning methodology and hence does not require alertness of an experienced engineer to initiate and supervise its initial operation in a separate commissioning identification pre-test. This interesting feature provides a new perspective on PID auto-tuning approaches. Performance of the proposed auto-tuning scheme is practically evaluated in a real pilot plant within a networked control system (NCS) configuration, realized by industrial Ethernet and Foundation fieldbus technologies. An extensive series of test scenarios has been conducted to explore efficiency of the proposed auto-tuning methodology to cope with fixed and varying operating set-points under uncertain and variable network transmission time delays and external disturbance.

关键词： Adaptive PID auto-tuning scheme auto-scaling fieldbus control system fuzzy PID IMC networked control system transmission delay

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Pork production information management system based on WEB

Pork production information management system based on WEB

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2nd International Conference on Modelling and Simulation

作者： Chen, QianLiang Huaiyin Inst Technol Huaian 223002 Jiangsu Prov Peoples R China

ISBN: (纸本)9781846260667

to solve traditional pork production system sharing informatization and enhance product efficiency, the paper has introduced the automatic technology based on fieldbus control system (FCS) and Intranet to manage pork manufacture informatization, and described FCS application in pork production process and the hardware structure of system and the functions of each part. The paper detailed the application of information technology based on WEB in the pork production process, and introduced the structure and function of the system, the successful application of the system has shown that the pork production system based on WEB technology can realize the intelligent and module of production information system.

关键词： Pork fieldbus control system JSP Information management system

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control system of Sintering Furnace Based on Lonworks Net

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3rd International Conference on Measuring Technology and Mechatronics Automation (ICMTMA 2011)

作者： Gong Chenglong Wang Jingzhuo Feng Yuan Huaihai Inst Technol Sch Elect Engn Lianyungang 222005 Peoples R China

ISBN: (纸本)9783037850190

This paper introduces a computer control network system which can control sintering process of four PTFE molding furnaces accurately. system in-out signals such as sintering temperature, on-off signals of dial motor and aeration motor were connected to Lonworks via net nodes, and network variables were used to construct a configuration and interlinkage between the net nodes. We chose a combined-control strategy in which On-off control or Fuzzy-control or Fuzzy-PID control strategy were selected automatically, so the needs to sintering time, cooling speed, steady-state precision etc were accurately achieved.

关键词： fieldbus control system Lonworks network combined-control Fuzzy-PID control

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fieldbus network implementation based on CAN

Fieldbus network implementation based on CAN

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2011 4th International Conference on Biomedical Engineering and Informatics, BMEI 2011

作者： Li, Luo Dept. of Computer Engineering SiChuan Vocational and Technical College of Communication Chengdu China

This paper introduces the technical characteristics of fieldbus CAN. According to protocol converter and intelligent node, it presents the integral structure of CAN fieldbus in industrial applications, and presents a ... 详细信息

ISBN: (纸本)9781424493524

关键词： CAN fieldbus CAN-BUS CAN-BUS protocol converter Companies control systems fieldbus control system Infranet Instruments Intelligent node Process control Protocol converter Protocols Real time systems Software communication protocol controller area networks

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Design and application of automatic logistics system based on 2-Dimensional Bar Code 11

Design and application of automatic logistics system based o...

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11th World Congress on Intelligent control and Automation

作者： Huang Qin-lui Ruan Wen-tao Chengdu Text Coll Sch Elect Engn Chengdu Sichuan Peoples R China

ISBN: (纸本)9781479958252

With glass fiber manufacturing industry as an example, studied the design and application of automatic logistics system based on 2-Dimensional Bar Code. The system through the analysis of information flow in the process of production, designed and studied the application in the production process about fieldbus control system, Programmable Logic controller, Manufacturing Execution system, Enterprise Resource Planning, 2-Dimensional Bar Code image system. Automation logistics system for the enterprise success implementation of integrative management provided an effective method for reference, implement the efficient intelligent monitoring and management of manufacturing process.

关键词： Image Recognition 2-Dimensional Bar Code Programmable Logic controller fieldbus control system Manufacturing Execution system Enterprise Resource Planning The Integration of Management and control

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Measurement of atmospheric refractive index structure constant near ground based on CAN bus

Measurement of atmospheric refractive index structure consta...

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Measurement Touch the World——IEEE 2011 10th International Conference on Electronic Measurement & Instruments(ICEMI’2011)

作者： Zhao Junwei Qiang Xiwen Feng Shuanglian Zhang Zhigang Northwest Institute of Nuclear Technology,Xi'an 710024,China

The principle of measuring atmospheric refractive index structure constant was introduced,and the specialities of the CAN bus were described.A system based on CAN bus was developed to measure the atmospheric refractive index structure constant in the open air and transmit the multi-parameter data from micro-thermal probe and weather transmitter for over 30m far through a 4-wire *** measurements for weeks have been taken,and daystart and sunset,the two weakest periods of the atmospheric turbulence,have been found on the experiment spot,and the regular pattern of the terbulence at different heights has been *** results supply necessary information for the laser propagation experiment near earth surface and show that the system is practical and effective for the multi-parameter measurements and transmissions in the field.

关键词： atmospheric optics atmospheric turbulence optic turbulence laser propagation refractive index structure constant CAN bus data transmission fieldbus control system

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Integrated Automation of Power Plant Electrical system

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Journal of Southeast University(English Edition) 2002年第3期18卷 221-224页

作者：郭伟王莉东南大学电气工程系南京210096 南京第五十五所南京210016

Aiming at the comparatively laggard level of power plant electrical system automation, this paper analyzes the feasibility,necessity and some key points of the application of integrated automation technology to power plant electrical system. New idea using fieldbus control system technology is presented. This paper also gives the outline and detailed schemes.

关键词： power plant electrical system fieldbus control system DCS integrated automation

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