Faults are detected during periodic automatic tests. A fault between tests can lead to a loss of the safety function. Category 2 / PL c or d SIL 1 or 2
The 2020 update primarily impacts new installations that utilize Type 2 safety light curtains, requiring tighter alignment with SIL/PL standards. Existing machinery does not generally need to be upgraded, but any modification to existing systems requires a new risk assessment according to the updated standard. iec 61496-1 pdf