Omron G9SR Series Operation Manual page 26

Operation manual
PFHd:
PL:
RESTART:
Safe State:
SLC:
XXVI
Probability Failures per Hour that are Dangerous
Performance Level as defined in ISO 13849-1
A sequence of the total system to come from a non-powered
situation to an operational situation. In an operational situation
OSSDs can be activated (ON) when a valid input signal is received.
A forced OFF state, the OSSDs are OFF.
Safety Light Curtain.
G9SR