Abbreviations - ABB ACS580-07 Hardware Manual

A fault exclusion on the failure mode "short circuit on printed circuit board" has been
made (EN 13849-2, table D.5). The analysis is based on an assumption that one failure
occurs at one time. No accumulated failures have been analyzed.
• STO reaction time (shortest detectable break): 1 ms
• STO response time: 2 ms (typical), 5 ms (maximum)
• Fault detection time: Channels in different states for longer than 200 ms
• Fault reaction time: Fault detection time + 10 ms
• STO fault indication (parameter 31.22) delay: < 500 ms
• STO warning indication (parameter 31.22) delay: < 1000 ms
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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
MTTFD EN ISO 13849-1
PFDavg IEC 61508
PFH IEC 61508
PL EN ISO 13849-1
SC IEC 61508
SFF IEC 61508
SIL IEC 61508
SILCL IEC/EN 62061
SS1 IEC/EN 61800-5-2
STO IEC/EN 61800-5-2
T1 IEC 61508-6
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: (The total number of life units) / (the number
of dangerous, undetected failures) during a particular measurement interval
under stated conditions
Average probability of dangerous failure on demand
Average frequency 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 sub-
system
Safe stop 1
Safe torque off
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 (page
Safe torque off function 233
113).