DescriptionReferenceTerm or ab-
breviation
Safe torque offIEC/EN 61800-5-2STO
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
￭ TÜV certificate
The TÜV certificate is available on the Internet at www.abb.com/drives/documents.
224 The Safe torque off function
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