Multi-loop networked process control: A synchronized approach

Manasi Das

doi:10.1016/j.isatra.2008.10.004

Multi-loop networked process control: A synchronized approach

2009-01-01

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DOI：10.1016/j.isatra.2008.10.004

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Modern day process control uses digital controllers which are based on the principle of distributed rather than centralized control. Distributing controllers, sensor 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 haven 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 systems. 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. (C) 2008 ISA. Published by Elsevier Ltd. All rights reserved.

Keywords:

Local area network

Message passing

Network control system

Synchronization

Multi-loop networked process control: A synchronized approach

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