Tüv Certificate - ABB ACH580-01 Hardware Manual

364 The Safe torque off function
Term or ab- Reference
breviation
PFD avg IEC 61508
PFH IEC 61508
PL EN ISO 13849-1
Proof test IEC 61508, IEC
62061
SC IEC 61508
SFF IEC 61508
SIL IEC 61508
STO IEC/EN 61800-5-2
T 1 IEC 61508-6
T M EN ISO 13849-1
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TÜV certificate
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Description
Average probability of dangerous failure on demand, that is,
mean unavailability of a safety-related system to perform the
specified safety function when a demand occurs
Average frequency of dangerous failures per hour, that is,
average frequency of a dangerous failure of a safety related
system to perform the specified safety function over a given
period of time
Performance level. Levels a...e correspond to SIL
Periodic test performed to detect failures in a safety-related
system so that, if necessary, a repair can restore the system
to an "as new" condition or as close as practical to this con-
dition
Systematic capability
Safe failure fraction (%)
Safety integrity level (1...3)
Safe torque off
Proof test interval. T 1 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 T 1 is required to keep the SIL capability valid. The same
interval must be followed to keep the PL capability (EN ISO
13849) valid.
See also section Maintenance.
Mission time: the period of time covering the intended use
of the safety function/device. After the mission time elapses,
the safety device must be replaced. Note that any T M values
given cannot be regarded as a guarantee or warranty.