On the Availability and Downtime of Safety-Critical Networked Control Systems

Author's Department

Electronics & Communications Engineering Department

Fourth Author's Department

Chemistry Department

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https://doi.org/10.1109/ECAI52376.2021.9515015

Document Type

Research Article

Publication Title

Proceedings of the 13th International Conference on Electronics, Computers and Artificial Intelligence, ECAI 2021

Publication Date

7-1-2021

doi

10.1109/ECAI52376.2021.9515015

Abstract

The scope of this paper is safety-critical Networked Control Systems (NCSs). These systems use fault-Tolerant architectures. Furthermore, this paper studies situations where repair times may be relatively long compared to the components' mean time to failure. Using Markov models and for a pre-determined level of redundancy, it is shown how to determine the most appropriate fault-Tolerant architecture in order to reduce downtime. Furthermore, situations are studied where safety requirements are relaxed and it is shown how to further reduce downtime in the most efficient way while minimizing safety hazards. Next, for factories which are reluctant to invest in on site spare parts and have long repair times, it is shown that storing just one spare part can have a drastic effect on downtime. Finally, a scheme is suggested to reduce the administrative cost of importing spare parts.

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