
Safety engineering
Device modules
Mission time
24
EDS94AYAF EN 1.0
1.2.3.4
Safety−related characteristics
Safety−related characteristics
SM302
Value
Comment
Control category according to
EN ISO 13849−1
Cat.
4
Category
Risk reduction according to
EN ISO 13849−1
PL
E
Performance Level
Risk reduction according to EN 61508 and
EN 62061
SIL
3
Safety Integrity Level
Probability of dangerous failure per hour
PFH
< E−9 1/h
< 1 % of SIL 3
Probability of dangerous Failure per Hour
Probability of dangerous failure via the
test interval
PFD
< E−4
< 10 % of SIL 3
Probability of dangerous Failure on Demand
Safe failure fraction
SFF
99 %
Safe Failure Fraction
Proof test interval/mission time
t
20 years
Proof Test Interval/Mission Time
Mean operating time to failure
MTTF
d
High
250 years
Mean Time To Failure dangerous
Average diagnostic coverage
DC
av
High
~ 95 %
Diagnostic Coverage
ƒ
In order to comply with control category 4 according to EN ISO 13849−1, external
wiring and cable monitoring must meet the requirements of category 4 (see chapter
1.2.5 and 1.2.6).
1.2.4
Mission time
The
mission time
) of the used component must be observed and complied with.
The given mission time is counted from the manufacturing date. The manufacturing dates
can be read out using the Lenze »Engineer« PC software. These can be found in the
parameter list within the "Identification" column.
Note!
After the mission time of a component has elapsed, the component must be
taken out of service or replaced. Any further operation is not permissible!