Characteristic Safety Values - Pepperl+Fuchs K-LB Series Manual

Functional Safety K-LB-*.*, F*-LB-I, P-LB-*.*.*
Planning
3.4

Characteristic Safety Values

The following tables contain no SFF characteristics, since this characteristics has
to be calculated with consideration of the connected field device.
DIN Mounting Rail Modules
K-LB-1.30, K-LB-2.30, K-LB-1.6, K-LB-2.6 (1oo1 structure)
Parameters Characteristics
Assessment type FMEDA report
and documentation
Device type A
Mode of operation Low demand mode or high demand mode
1
Safety function Pass through the signal
HFT 0
2
SIL 2 or 3
1
Signal type AI
1
Safe state I
in
Signal line
interrupted
Safety loop fault < 3.6 mA and
3
detection > 21 mA can be
detected
+  0 FIT

sd su
16.1 FIT

dd
0 FIT

du
41.1 FIT

no effect
0 FIT

not part
16.1 FIT

total (safety function)
4
MTBF 2002 years (1-channel device), 1001 years (2-channel device)
PFH 0 1/h
PFD for 0
avg
T = 1 year
1
Table 3.2
1
The safe state of the surge protection barrier depend on the application.
2
The maximum safety integrity level of the safety loop in which the device might be used depends on the characteristics
of the whole saftey loop and the connected field devices in the application.
3
This fault detection has to be provided by the safety loop architecture
(e. g. NAMUR signal – lead breakage and short circuit detection, current loop > 20 mA).
4
acc. to SN29500. This characteristic includes failures which are not part of the safety function/MTTR = 8 h.
AO
< 3.6 mA I < 3.6 mA
out
Signal line
interrupted
No fault detection
since < 3.6 mA is
safe state of the
safety loop
16.1 FIT
0 FIT
0 FIT
41.1 FIT
0 FIT
16.1 FIT
0 1/h
0
DI DO
I = 0 mA I
out out
U = 0 V U
out out
Signal line Signal line
interrupted interrupted
SC and LB detection No fault detection
of the safety loop
8.1 FIT 16.1 FIT
8.0 FIT 0 FIT
0 FIT 0 FIT
41.1 FIT 41.1 FIT
0 FIT 0 FIT
16.1 FIT 16.1 FIT
0 1/h 0 1/h
0 0
= 0 mA
= 0 V
13