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Failure Mode Effects
and Detectability Analysis |
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| Project |
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Sample |
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Total Failure Rate |
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2435.01 |
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| Schematic |
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564-374C |
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Revision |
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G |
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| Project
# |
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563T43 |
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Total Safe Failure Rate |
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1791.21 |
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| Project
Manager |
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Markus Weber |
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Total Dangerous Failure
Rate |
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643.80 |
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| FMEDA
Started |
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8/1/2003 |
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Total Safe Detected
Failure Rate |
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835.45 |
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| Last
Updated |
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9/4/2003 |
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Total Safe Undetected
Failure Rate |
955.76 |
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| Version |
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0.20 |
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Total Dangerous Detected
Failure Rate |
358.80 |
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| Other
Remarks |
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Total Dangerous
Undetected Failure Rate |
285.00 |
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Safe Failure Fraction |
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88% |
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safe failure is defined as a failure that would cause the OS detector to
detect an high trip event and flag an low trip event |
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% of Safe Failures |
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74% |
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dangerous failure is defined as a failure that would cause the OS detector to
NOT detect an high trip event and NOT flag an low trip event |
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Safe Coverage |
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47% |
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"don't care" is a failure that has no effect on the function of the
system. |
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Dangerous Coverage |
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56% |
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| Drift
failures are only assumed for resistors over 100K Ohms. |
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diagnostic purposes the entire system has to be taken into account. |
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5 - Failure Mode (S-safe
/ D-dangerous / #-don't care |
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6 - Component type (A/B) |
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7 - Number of components
in identical function |
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8 - Overall FIT Rate |
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9 - Contribution of
Failure Mode to FIT Rate |
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10 - Failure rate for
failure mode |
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11 - Detectable (1=yes) |
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12 - Diagnostic method |
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13 - Detection Level |
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| 1 |
Value |
Type |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
13 |
14 |
15 |
16 |
17 |
18 |
19 |
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| NAME |
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Function |
Failure Mode |
Effect |
M |
T |
# |
FIT |
% distr. |
FM FIT |
Det. |
Diagnostic |
Level |
SD |
SU |
DD |
DU |
Reference for FIT |
Remarks |
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| C9 |
0.0068 uF |
MF |
Filter
Cap |
Open |
loss
of filtering |
# |
A |
1 |
1.4 |
6.00 |
0.08 |
0 |
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0.00 |
0.00 |
0.00 |
0.00 |
MIL-HDBK-217 |
10-17 |
OK |
6 |
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Short |
loss
of input signal |
S |
A |
1 |
1.4 |
30.80 |
0.43 |
1 |
Low trip |
PLC |
0.43 |
0.00 |
0.00 |
0.00 |
MIL-HDBK-217 |
10-17 |
OK |
36.8 |
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Drift |
filter
degradation |
# |
A |
1 |
1.4 |
63.20 |
0.88 |
0 |
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0.00 |
0.00 |
0.00 |
0.00 |
MIL-HDBK-217 |
10-17 |
OK |
100 |
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| R22 |
10K |
CF |
Input
divider |
Open |
input
signal shift |
# |
A |
1 |
3.9 |
51.20 |
2.00 |
0 |
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0.00 |
0.00 |
0.00 |
0.00 |
MIL-HDBK-217 |
9-2 |
OK |
51.2 |
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Short |
loss
of input signal |
S |
A |
1 |
3.9 |
7.40 |
0.29 |
1 |
Low trip |
PLC |
0.29 |
0.00 |
0.00 |
0.00 |
MIL-HDBK-217 |
9-2 |
OK |
58.6 |
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Drift |
input
signal shift |
# |
A |
1 |
3.9 |
41.40 |
1.61 |
0 |
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0.00 |
0.00 |
0.00 |
0.00 |
MIL-HDBK-217 |
9-2 |
OK |
#REF! |
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| R4 |
1K |
CF |
Input
divider |
Open |
loss of input
signal |
S |
A |
1 |
3.9 |
51.20 |
2.00 |
1 |
Low trip |
PLC |
2.00 |
0.00 |
0.00 |
0.00 |
MIL-HDBK-217 |
9-2 |
OK |
51.2 |
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Short |
loss
of input signal |
# |
A |
1 |
3.9 |
7.40 |
0.29 |
1 |
Low trip |
PLC |
0.00 |
0.00 |
0.00 |
0.00 |
MIL-HDBK-217 |
9-2 |
OK |
58.6 |
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Drift |
input signal
shift |
# |
A |
1 |
3.9 |
41.40 |
1.61 |
0 |
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0.00 |
0.00 |
0.00 |
0.00 |
MIL-HDBK-217 |
9-2 |
OK |
#REF! |
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| Q1 |
2N2102 |
NPN |
Input
transistor |
loss
of function |
loss
of signal |
S |
A |
1 |
38.0 |
100.00 |
38.00 |
1 |
Low
trip |
PLC |
38.00 |
0.00 |
0.00 |
0.00 |
MIL-HDBK-217 |
6-6 |
OK |
100 |
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| R5 |
10K |
CF |
Trs pull-up |
Open |
loss of input
signal |
S |
A |
1 |
3.9 |
51.20 |
2.00 |
1 |
High trip |
PLC |
2.00 |
0.00 |
0.00 |
0.00 |
MIL-HDBK-217 |
9-2 |
OK |
51.2 |
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Short |
loss
of input signal |
S |
A |
1 |
3.9 |
7.40 |
0.29 |
1 |
High trip |
PLC |
0.29 |
0.00 |
0.00 |
0.00 |
MIL-HDBK-217 |
9-2 |
OK |
58.6 |
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Drift |
input
signal shift |
# |
A |
1 |
3.9 |
41.40 |
1.61 |
0 |
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0.00 |
0.00 |
0.00 |
0.00 |
MIL-HDBK-217 |
9-2 |
OK |
#REF! |
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| C2 |
100
pF |
CE |
AC
coupler |
Open |
loss of input
signal |
S |
A |
1 |
1.4 |
6.00 |
0.08 |
1 |
Low trip |
PLC |
0.08 |
0.00 |
0.00 |
0.00 |
MIL-HDBK-217 |
10-17 |
OK |
6 |
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Short |
bad
input signal |
S |
A |
1 |
1.4 |
30.80 |
0.43 |
1 |
High trip |
PLC |
0.43 |
0.00 |
0.00 |
0.00 |
MIL-HDBK-217 |
10-17 |
OK |
36.8 |
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Drift |
shift
trip point |
S |
A |
1 |
1.4 |
63.20 |
0.88 |
1 |
Low
trip |
PLC |
0.88 |
0.00 |
0.00 |
0.00 |
MIL-HDBK-217 |
10-17 |
OK |
#REF! |
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| R8 |
10K |
CF |
Input
divider |
Open |
input
signal shift |
# |
A |
1 |
3.9 |
51.20 |
2.00 |
0 |
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0.00 |
0.00 |
0.00 |
0.00 |
MIL-HDBK-217 |
9-2 |
OK |
51.2 |
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Short |
loss of input
signal |
S |
A |
1 |
3.9 |
7.40 |
0.29 |
1 |
Low trip |
PLC |
0.29 |
0.00 |
0.00 |
0.00 |
MIL-HDBK-217 |
9-2 |
OK |
58.6 |
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Drift |
input signal
shift |
# |
A |
1 |
3.9 |
41.40 |
1.61 |
0 |
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0.00 |
0.00 |
0.00 |
0.00 |
MIL-HDBK-217 |
9-2 |
OK |
#REF! |
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| Q2 |
2N2102 |
NPN |
Input
transistor |
loss
of function |
loss
of signal |
S |
A |
1 |
60.0 |
27.7 |
16.62 |
1 |
Low trip |
PLC |
16.62 |
0.00 |
0.00 |
0.00 |
MIL-HDBK-217 |
6-6 |
OK |
27.7 |
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Short |
OS trip |
S |
A |
1 |
60.0 |
72.3 |
43.38 |
1 |
High trip |
PLC |
43.38 |
0.00 |
0.00 |
0.00 |
MIL-HDBK-217 |
6-6 |
OK |
100 |
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Drift |
signal
degradation |
S |
A |
1 |
60.0 |
0.0 |
0.00 |
1 |
Low trip |
PLC |
0.00 |
0.00 |
0.00 |
0.00 |
MIL-HDBK-217 |
6-6 |
OK |
#REF! |
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| Total |
Page 2 |
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361.86 |
231.74 |
152.67 |
186.34 |
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| Total |
Page 3 |
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214.45 |
493.21 |
182.83 |
86.56 |
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| Total |
Page 4 |
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154.45 |
230.81 |
23.30 |
12.10 |
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| Total |
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835.45 |
955.76 |
358.80 |
285.00 |
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| Note:
Attributes like redundancy, voting or self test should not be taken into
account. |
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