Composite security. Safe automatic treatment of possible dangerous failures. Fail-safe technique for which, in a module of a safety system, a first dangerous failure, even if not immediately harmful, is promptly self-detected, so that internal inhibiting actions (Negation) are activated, this in such a short time that there cannot be the risk of a second dangerous failure occurring, in the time between the discovery and the inhibition of the first fault (Reactive Fail Safety and Inherent Fail Safety)
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