CG Drives & Automation 01-7513-11r0
Appendix
55
PFDavg
EN IEC 61508
Average probability of dangerous failure on
demand, that is, mean unavailability of a
safety-related system to perform the
specified safety function when a demand
occurs
PFH
D
EN IEC 61508
Average frequency of dangerous failures per
hour, that is, average frequency of a
dangerous failure of a safety-related system
to perform the specified safety function over
a given period of time
PL
EN ISO 13849-1
Performance level. Levels a…e correspond to
SIL. Characteristic value of EN ISO 13849 for
the reliability which a controller fulfills a
safety function.
SC
EN IEC 61508
Systematic capability.
SFF
EN IEC 61508
Safe failure fraction (%).
SIL
EN IEC 61508
Safety integrity level (1…3) according to EN
IEC 62061 or EN IEC 61508.
SILCL
EN IEC 62061
Maximum SIL (level 1…3) that can be
claimed for a safety function or subsystem
SRP/CS
Safety related part of a controller. Part of a
controller that responds to safety-related
input signals and safety related output
signals.
STO
EN IEC 61800-5-2
Safe torque off.
STO
active
STO ‘active’ means that the safe torque off
safety function have been triggered by
removing power from one or both STO inputs.
STO activation removes the power from the
gate drive / motor (safe state).
Table 10
Safety related abbreviations
Abbr.
Reference
Description
Содержание Emotron OSTO 100
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