Safety Function And Safe State; Characteristic Safety Values - Pepperl+Fuchs K D0-RSH-1.1D F Series Manual

Functional Safety K*D0-RSH-1.1D.(F)*, HiC5861(Y1)
Planning
3.3

Safety Function and Safe State

Safety Function
The safety function of the device is defined: Whenever the input of the device is de-energized,
the DTS output is not conducting.
Safe State
In the safe state of the safety function the DTS output is open (non-conducting).
Reaction Time
The reaction time is < 150 ms.
3.4

Characteristic Safety Values

Parameters
Assessment type and documentation
Device type
Mode of operation
Safety function
HFT
SIL (SC)
SILCL
PL

s

dd

du

total (safety function)
1
SFF
2
MTBF
MTTF
d
PTC
PFH
PFD for T = 5 years
avg 1
PFD for T = 10 years
avg 1
T max.
1
Table 3.1
1
The SFF value was not calculated according to IEC/EN 61508-2.
2
acc. to SN29500. This value includes failures which are not part of the safety function/MTTR = 8 h.
The characteristic safety values like PFD, PFH, SFF, HFT and T
from the FMEDA report. Observe that PFD and T
The function of the devices has to be checked within the proof test interval (T
12
Characteristic values
Full assessment
A
Low demand mode or high demand mode
DTS
0
3
3
e
350 FIT
0 FIT
0.71 FIT
351 FIT
99.8 %
185 years
> 2500 years
100 %
-9
0.71 x 10 1/h
-5
1.54 x 10
-5
3.09 x 10
32 years
are taken
1
are related to each other.
1
).
1