Abbreviations - ABB ACS355 series User Manual

430 Appendix: Safe torque off (STO)
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Abbreviations

Abbreviation Reference
CCF EN ISO 13849-1
DC EN ISO 13849-1
HFT IEC 61508
MTTF EN ISO 13849-1
d
PFD IEC 61508
PFH IEC 61508
PL EN ISO 13849-1
SC IEC 61508
SFF IEC 61508
SIL IEC 61508
SILCL EN 62061
STO IEC/EN 61800-5-2 Safe torque off
T1 IEC 61508
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Declaration of conformity
Declaration of conformity (3AXD10000414701) is available on the Internet. See
section Document library on the Internet

Certificate
TÜV certificate (3AXD00000600767) is available on the Internet. See section
Document library on the Internet
Common cause failure (%)
Diagnostic coverage
Hardware fault tolerance
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
Probability of failure on demand
Probability of dangerous failures per hour
Performance level. Levels a...e correspond to SIL
Systematic capability
Safe failure fraction (%)
Safety integrity level (1...3)
Maximum SIL (level 1...3) that can be claimed for a safety
function or subsystem
Proof test interval. T1 is a parameter used to define the
probabilistic failure rate (PFH or PFD) for the safety
function or subsystem. Performing a proof test at a
maximum interval of T1 is required to keep the SIL
capability valid. The same interval must be followed to keep
the PL capability (EN ISO 13849) valid. Note that any T1
values given cannot be regarded as a guarantee or
warranty.
See also section Maintenance
on the inside of the back cover.
on the inside of the back cover.
Description
(page 425).