Abbreviations; Declaration Of Conformity - ABB ACS380 Hardware Manual

152 Safe torque off function
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Abbreviations

Abbr. Reference
Cat. EN ISO 13849-1
CCF EN ISO 13849-1
DC EN ISO 13849-1
FIT IEC 61508
HFT IEC 61508
MTTF EN ISO 13849-1
D
PFD IEC 61508
avg
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
T IEC 61508
1
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Declaration of conformity

Declaration of conformity is available on the Internet. Refer to the inner back cover.
Description
Classification of the safety-related parts of a control system
in respect of their resistance to faults and their subsequent
behavior in the fault condition, and which is achieved by the
structural arrangement of the parts, fault detection and/or by
their reliability. The categories are: B, 1, 2, 3 and 4.
Common cause failure (%)
Diagnostic coverage
Failure in time: 1E-9 hours
Hardware fault tolerance
Mean time to dangerous failure: (Total number of life units) /
(Number of dangerous, undetected failures) during a
particular measurement interval under stated conditions
Average probability of dangerous failure on demand
Average frequency of dangerous failure 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
Safe torque off
Proof test interval. T
1
probabilistic failure rate (PFH or PFD) for the safety function
or subsystem. Performing a proof test at a maximum interval
of T is required to keep the SIL capability valid. The same
1
interval must be followed to keep the PL capability
(EN ISO 13849) valid. Note that any T
be regarded as a guarantee or warranty.
See also section Maintenance
is a parameter used to define the
values given cannot
1
(page 148).