Description
Reference
Abbr.
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
IEC 61508
PFD
avg
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
IEC 61508
PFH
Performance level. Levels a…e correspond to SIL
EN ISO 13849-1
PL
Systematic capability
IEC 61508
SC
Safe failure fraction (%)
IEC 61508
SFF
Safety integrity level (1…3)
IEC 61508
SIL
Maximum SIL (level 1…3) that can be claimed for a safety function
or subsystem
IEC/EN 62061
SILCL
Safe torque off
IEC/EN 61800-5-2
STO
Proof test interval. T
1
is a parameter used to define the probabilistic
failure rate (PFH or PFD) for the safety function or subsystem. Per-
forming 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
.
The Safe torque off function 185
Содержание ACH580-04
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Страница 186: ... Declaration of conformity 186 The Safe torque off function ...
Страница 206: ...Dimension drawing 206 External control unit option P906 ...
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