Multi-loop networked process control: A synchronized approach

Modern day process control uses digital controllers which are based on the principle of distributed rather than centralized control. Distributing controllers, sensors and actuators across a plant entails considerable wiring which can be reduced substantially by integrating the components of a contro...

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Bibliographic Details
Published in:ISA transactions 2009, Vol.48 (1), p.122-131
Main Authors: Das, M., Ghosh, R., Goswami, B., Chandra, A.K., Balasubramanian, R., Luksch, P., Gupta, A.
Format: Article
Language:English
Subjects:
Applied sciences
Computer science
control theory
systems
Computer systems and distributed systems. User interface
Control systems
Control theory. Systems
Controllers
Exact sciences and technology
Local area network
Message passing
Network control system
Networks
Process control
Process control. Computer integrated manufacturing
Sampling
Sensors
Software
Synchronism
Synchronization
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Summary:Modern day process control uses digital controllers which are based on the principle of distributed rather than centralized control. Distributing controllers, sensors and actuators across a plant entails considerable wiring which can be reduced substantially by integrating the components of a control loop over a network. The other advantages include greater flexibility and higher reliability with lower hardware redundancy. The controllers and sensors are on a network and can take over the function of a failed component automatically, without the need of manual reconfiguration, thus eliminating the need of having a redundant component for each and every component. Though elaborate techniques have been developed for Single Input Single Output (SISO) systems, the major challenge lies in extending these ideas to control a practical process plant where de-centralized control is actually achieved through control of individual SISO control loops derived through de-coupling of the original system. Multiple loops increase network load and hence the sampling times associated with the control loops and makes synchronization difficult. This paper presents a methodology by which network based process control can be applied to practical process plants, with a simple direct synchronization mechanism.
ISSN:0019-0578
1879-2022
DOI:10.1016/j.isatra.2008.10.004