ABB Q957 User Manual page 14

14 Introduction to the manual
Term
PL
POUS
SC
SIL
SILCL
STO
T
1
Description
Performance level. Levels a...e correspond to SIL (EN ISO 13849-1)
Prevention of unexpected start-up
Systematic capability (IEC 61508)
Safety integrity level (1...3) (IEC 61508)
Maximum SIL (level 1...3) that can be claimed for a safety function or subsystem
(IEC/EN 62061)
Safe torque off (IEC/EN 61800-5-2)
Proof test interval. Defines the probabilistic failure rate (PFH or PFD
function or subsystem. Performing a proof test at a maximum interval of T
to keep the SIL capability valid. The same interval must be followed to keep the PL
capability (EN ISO 13849) valid. Note that any T
as a guarantee or warranty.
) for the safety
avg
1
values given cannot be regarded
1
is required