Copley Controls Xenus Plus Compact Manual page 7

Xenus Plus Compact STO Manual
1.10 Abbreviations and Acronyms
Page 7 of 31
Acronym
Safety-Related
a,b,c,d,e
Cat.
CCF
DC
avg
FS
HFT
MTTF
MTTFd
OVC
PDS(SR)
PELV
PFD
PFH
PL
PLr
S, S1, S2
SELV
SFF
SIL
SIL CL
SPD
STO
Copley Controls Related
XEC
XPC
Description
Denotation of performance level (PL)
Category
Common Cause Failure
Diagnostic Coverage, Average
Functional Safety
Hardware Fault Tolerance
Mean Time to Failure
Mean Time to Dangerous Failure
Over-Voltage Category
Power Drive Systems (Safety Related)
Protected Extra Low Voltage (power
supply)
Probability of Dangerous Failure upon
Demand
Probability of Failure per Hour
Performance Level
Performance Level requirement
Severity of Injury
Safety Extra Low Voltage (power supply)
Safety Failure Fraction
Safety Integrity Level
Safety Integrity Level Limit or Capability
Level
Surge Protection Device
Safe Torque Off
Xenus Plus XEC EtherCAT
Xenus Plus XPC CANopen
Table 3
16-01553 Rev 00
Copley Controls