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5. Security
Safety is defined as the ability of a device not to generate critical or catastrophic events, injuries or damage to health.
When we quantify this parameter, we express it as the probability that the system will avoid the occurrence of these critical, catastrophic or physically damaging events.
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The concept of safety is closely linked to that of risk. The risk associated with critical events is, in fact, a function of two parameters: the severity of the damage and the probability of occurrence of that damage (or of the event generating the damage).
In the space separated into "acceptable" and "unacceptable" zones, figure 4 shows that an event A (a failure, for example),...
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