A High Availability Vital Computer for Railway Applications: Architecture & Safety Principles
Résumé
The computers used for Railway Automation have increasing their level of safety and availability, especially for providing expected answer to Unattended Train Operation.
To achieve these demanding requirements, relevant answers have to be addressed. In this article, we first present the architecture of our computer, based on a vital coding processing, and its embedded redundancy feature, which both allow the achievement of an efficient architecture providing the high availability requested by the above mentioned Railway Applications.
We then present the principles used in the safety design and used to bring out the safety evidences. We will specifically highlight the safety and performance issues raised by assembling two single vital computers into a redundant configuration. Nevertheless, we have to stress that in our choice of design, the redundancy is used only to address the availability goal
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