2. Normative context

2.1 IEC 61508 standard

For this class of system, studies must be carried out to demonstrate the absence of failures that would be contrary to safety. However, not all systems are considered critical. There are scales for defining levels of criticality, associated with objectives to be achieved.

The standard IEC 61508 is to describe the management of safety in the sense of harmless safety (no impact on people, property or the environment). To achieve this, it is not only possible to focus on safety-innocuity, but...