Terms And Abbreviations - Reer PI SQ F-NF Manual De Instrucciones

13 Terms and abbreviations

OSSD Output Signal Switch Device
PDDB Proximity devices with defined
behaviour under fault condi-
tions
PFH Probability of (dangerous)
(PFH ) Failure per Hour
D
PL Performance Level
SIL Safety Integrity Level
SILCL Safety Integrity Level
T Mission time
M
20
PL to EN ISO 13849-1
SIL 1-4 to IEC 61508. The higher the
SIL, the lower the probability that a safety
function will fail.
According to IEC 62061
claim limit
Lifetime to IEC 60947-5-3
(= max. service life)