Appendix: Safe Torque Off (STO) 207
Abbreviations
Abbreviation Reference Description
CCF EN ISO 13849-1 Common Cause Failure (%)
DC EN ISO 13849-1 Diagnostic Coverage
FIT EN 61508 Failure In Time: 1 × 10
-9
hours
HFT EN 61508 Hardware Fault Tolerance
IGBT Insulated-gate bipolar transistor: The electrical
compon
ents that drive the motor power outputs
MTTF
D
EN ISO 13849-1 Mean Time To dangerous Failure: (The total number of
life units) / (the number of dangerous, undetected
failures) during a particular measurement interval under
stated conditions
PFD EN 61508 Probability of Failure on Demand
PFH EN 61508 Probability of Dangerous Failures per Hour
PL EN ISO 13849-1 Performance Level: Corresponds SIL, Levels a-e
PTI EN 61508 Proof Test Interval
SFF EN 61508 Safe Failure Fraction (%)
SIL EN 61508 Safety Integrity Level
STO EN 61800-5-2
IEC 61800-5-2
Safe Torque Off
CE Declaration of Conformity
The declaration (3AXD10000540159) is available on the internet. See Document
library on the Internet on page 209.
TüV Certificate
The TüV Certificate (3AXD10000540318) is available on the internet. See Document
library on the Internet on page 209.
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