wilamowski-b-m-irwin-j-d-industrial-communication-systems-2011

53-16 Industrial Communication Systems
53.7 Conclusions
In this chapter, a brief review of three emerging solutions implementing wireless sensor networks for
industrial applications—primarily for process control—has been reported. Such networks are in general
designed to carry traffic that is mainly constituted by exchanges of sensor readings (and actuator
commands) toward (from) centralized controllers. Important characteristics of industrial traffic are
the presence of deadlines, high-reliability requirements, and the predominance of short packets. All
the proposed solutions address this problems in a very similar manner. They adopt a TDMA approach
to wireless shared medium, while mesh or cluster topologies allow covering large areas with low-power
RF signals. External interferences due to other transmitters operating in the same or in neighbored frequency
bands—a problem especially pronounced in the license-free industrial, scientific, and medical
(ISM) bands—are faced with frequency agile approaches. Security is ensured by means of cryptography,
which allows to answer to questions like “who sent this message?” (authentication) and “is this the message
originally sent?” (message integrity).
However, there is still a broad potential for future research in wireless industrial communication
systems. Up to now, very few plants/demonstrations have been implemented to prove the viability of
such solutions.
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