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Functional Safety K-LB-*.*, F*-LB-I, P-LB-*.*.*
Planning
Plug-In Modules
P-LB-1.D.*, P-LB-1.F.* (1oo1 structure)
Parameters
Characteristics
Assessment
FMEDA report
type and
documenta-
tion
Device type
A
Mode of
Low demand mode or high demand mode
operation
Safety
Pass through the signal
1
function
HFT
0
2
SIL
2 or 3
1
Signal type
4-wire
resistance
thermometer
(RTD)
1
Safe state
Threshold
Safety loop
< 3.6 mA and
fault detection
> 21 mA can
3
be detected
+
0 FIT
sd
su
43 FIT
dd
16 FIT
du
143 FIT
no effect
0 FIT
not part
59 FIT
total (safety
function)
4
MTBF
564 years (all components of the device)
PFH
1.79 x 10
PFD
for
7.84 x 10
avg
T
= 1 year
1
Table 3.5
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.
16
3-wire
Voltage
resistance
source
thermometer
(RTD)
Threshold
Threshold
< 3.6 mA and
< 3.6 mA and
> 21 mA can
> 21 mA can
be detected
be detected
0 FIT
0 FIT
23.1 FIT
27 FIT
12 FIT
8.1 FIT
101 FIT
101 FIT
66 FIT
66.1 FIT
35.1 FIT
35.1 FIT
-8
-8
1/h 1.79 x 10
1/h 1.79 x 10
-5
-5
7.84 x 10
7.84 x 10
2-wire
Potentiometer Thermo-
resistance
thermometer
(RTD)
Threshold
Threshold
< 3.6 mA and
< 3.6 mA and
> 21 mA can
> 21 mA can
be detected
be detected
0 FIT
0 FIT
16 FIT
12.1 FIT
0.02 FIT
22.9 FIT
41.1 FIT
101 FIT
145 FIT
66.1 FIT
16.02 FIT
34 FIT
-8
-8
1/h 1.79 x 10
1/h 1.79 x 10
-5
-5
7.84 x 10
7.84 x 10
couple (TC)
Threshold
< 3.6 mA and
> 21 mA can
be detected
0 FIT
8.1 FIT
8 FIT
41.1 FIT
145 FIT
16.1 FIT
-8
-8
1/h 1.79 x 10
1/h
-5
-5
7.84 x 10
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