Title
: A Novel Microcontroller-Based
Wireless Network for DCS
Author :
Ali Mohamed
Ibrahim
Collection : PH.D. Electric
Abstract:
A
current trend in the development and implementation of industrial applications
is to use wireless networks to communicate with the distributed system nodes,
mainly to increase application flexibility, reliability and portability, as
well as to reduce the implementation cost. Wireless Sensor Networks WSN is a
promising solution in this field. In the latest test-bed, there is a trend that
ZigBee technology could be used as wireless network technology to realize a
distributed intelligent system. So a novel architecture of distributed
intelligent control systems using Wireless ZigBee Networks is deployed by
providing a framework for highly distributed intelligent wireless control
network based on ZigBee technology. The system consists of intelligent nodes
with distributed algorithm that can be implemented based on common 8-bit MCV
microcontrollers with a wireless means of communication. With the rapid
development of the field of industrial process control and the fast
popularization of ZigBee technology, commercial wireless radio modules can form
a flexible distributed intelligent system that has a cost-effective developing
platform allowing easy customization. This thesis presents the design and
implementation of a web based Distributed Control System DCS built on the
wireless communication protocols IEEE 802.15.4, ZigBee and Digimesh. The
development of decentralized distributed input-output systems used for the
process control, data acquisition and monitoring can be realized by dividing
the overall plant process into many subsystems or small processes , each
carries only the code necessary for the specific set of activities performed by
the subsystems. This can be contrasted to a centralized control system that
requires complex programming to govern the entire system. The monitoring and
process control unit for each subsystem is geographically distributed in the
controlled plant. This thesis presents the design and implementation of a
Distributed Control System DCS built on the wireless communication protocols
IEEE 802.15.4, ZigBee. As the nature of the ZigBee mesh network enabled us to decentralize/modularize
the plant process complex programming code creating a distributed intelligent
control system, actual wireless controlling and monitoring systems based on
ZigBee technology and microchip PIC microcontrollers have been established. We conducted
our application example and simulators in a real world environment that allowed
us to prove that the proposed solution is applicable and efficient. The
practical use of ZigBee technology proved to be easy and cheap, it can be
applied also to existing systems and not only to new systems with fewer
modifications in short time and with a minimum cost and with fairly large
transmission range within line of sight both indoor and outdoor compared to the
other wireless technologies. The practical results also indicate that the
implemented systems achieve the goals of distributing the complex control
systems into simple intelligent subsystems with a high great of reliability,
significant cost savings in engineering time and materials, including less
wiring and smaller control panels, reduced installation times, with improved
performance, less rnaertenance and fast replacement of defected components.
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