DescriptionReferenceTerm or
abbreviation
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.
IEC 61508-6
T
1
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.
EN ISO 13849-1
T
M
Dangerous failure rate (per hour) of the diagnostics function of
STO
IEC 61508-6λ
Diag_d
Safe failure rate (per hour) of the diagnostics function of STOIEC 61508-6λ
Diag_s
￭
TÜV certificate
The TÜV certificate is available on the Internet at www.abb.com/drives/documents.
210 The Safe torque off function
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