Siemens SIMATIC KP8 Operating Instructions Manual page 87

Input unit – 1oo2 mode
Parameter
Hardware Fault Tolerance
Classification
Architecture
Failure mode


Failure Mode Diagnostic


Diagnostic Coverage
Diagnostic test interval
Safe Failure Fraction
Common Cause Factor
Controller
Parameter
Hardware Fault Tolerance
Classification
Architecture
Failure mode


Failure Mode Diagnostic


Diagnostic Coverage
Diagnostic test interval
Safe Failure Fraction
Common Cause Factor
KP8, KP8F
Operating Instructions, 10/2010, A5E03284305-01
Detected
Undetected
Detected
Undetected
detected
undetected
Detected
Undetected
Value
1
A
1oo2D
Dangerous process value
5.78 FIT

0.06 FIT

No error signaling or no safe
values
0 FIT

0 FIT

99.00 %
15 ms
99.86 %
2 %
Value
1
B
1oo2D
Dangerous process value
174,00 FIT

1,68 FIT

No error signaling or no safe
values
0 FIT

0 FIT

99.04 %
15 ms
99.23 %
2 %
Technical specifications
9.3 Fail-safe mode
Comment
–
–
1st detected failure leads to the safe
state
Due to failures in the input circuit
One channel
One channel
Calculation according
IEC13849:2006 CAT4
–
Errors detected in each firmware
cycle
–
–
Comment
–
–
1st detected failure leads to the safe
state
Due to failures in the processing unit
One channel

One channel

Calculation according
IEC13849:2006 CAT4
–
Errors detected in each firmware
cycle
–
–
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