The causes of hazards and the technical measures applied to avoid them can vary widely. As a result, different types of safety are distinguished by the cause of potential hazards, for example.
We talk about "functional safety" when safety depends on the correct function of an electrical (E), electronic (E) and programmable electronic (PE) system (abbreviated to: E/E/PE system).
The risk assessment plays a key role with regard to functional safety requirements. The steps you need to consider in the risk assessment and risk reduction of machines and the way in which safety functions can be evaluated and verified are taken from the standards EN ISO 12100, 13849-1/-2 and EN 62061. The safety integrity requirements (PL, SIL) are derived from the risk estimation.