Approches de sûreté de fonctionnement sur Ethernet temps réel : application à une nouvelle génération d’ascenseur

Abstract : The design of a communication network with a real-time Ethernet-based security that meets the requirements of the PESSRAL standard, derived from IEC 61508, is the basis of our work. In order to achieve this goal, we implement mechanisms reducing the residual error probability and achieving Safety Integrity Levels (SIL) via a deterministic electronic system. Through a single communication channel, our system must be able to integrate critical and non-critical functions without compromising the system certification.According to this commitment, we suggest an industrial communication system based on real-time Ethernet. The proposed communication interfaces meet the requirements of responsiveness and determinism in order to guarantee the temporal constraints imposed by the process and the standard. To ensure the functional safety of the interfaces, we have proposed a "safety" overlay that implements security functions according to the concept of the black channel defined in IEC 61508. Based on these properties, we have managed to classify the Ethernet-based real-time solutions into three classes in terms of cycle time. The overlay "safety", based on the redundancy of data, made it possible to give up the solution of physical redundancy. This data redundancy duplicates the initial cycle time of the network, which nonetheless satisfies the security and time conditions of the standard.
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Ayoub Soury. Approches de sûreté de fonctionnement sur Ethernet temps réel : application à une nouvelle génération d’ascenseur. Automatique. Université Grenoble Alpes, 2018. Français. ⟨NNT : 2018GREAT029⟩. ⟨tel-01881782⟩

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