Fail-safe operation of the Mobile Panel 277F IWLAN
Function Manual, 08/2008, 6AV6691-1FQ01-2AB0
109
Technical data
9
This chapter lists the specifications that are relevant for fail-safe operation.
For more information, please read Application and ambient conditions (Page 42).
Additional specifications can be found in the operating instructions for the HMI device.
9.1
Technical data for fail-safe operation
Fail-safe operation
WARNING
The safety characteristics in the specifications apply for a proof-test interval of 10 years and
a mean repair time of 8 hours.
In accordance with IEC 61508
Hardware architecture
Redundant 1oo2
Hardware error tolerance
1
Safe failure fraction
99,5 %
Diagnostic test interval
10 ms
Request rate
High demand mode
High demand (PFH: probability of a dangerous failure per
hour) at 40 °C
8.60E-11 1/h
Maximum achievable safety class (SIL)
3
Useful life
10 years
In accordance with DIN EN ISO 13849-1
Mean time to failure (MTTF
d
)
1516 years
Meantime to Restoration (MTTR)
8 hours
Diagnostic coverage (DC)
99 %
Performance level (PL)
e
Safety category
4
In accordance with EN 954-1
Safety category
4