Siemens SIMATIC KP8, Руководство по эксплуатации

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Technical specifications
9.3 Fail-safe mode
KP8, KP8F
Operating Instructions, 10/2010, A5E03284305-01
87
Input unit – 1oo2 mode
Parameter Value Comment
Hardware Fault Tolerance 1 –
Classification A –
Architecture 1oo2D 1st detected failure leads to the safe
state
Failure mode

Detected
 Undetected
Dangerous process value

5.78 FIT
 0.06 FIT
Due to failures in the input circuit
One channel
One channel
Failure Mode Diagnostic

Detected

Undetected
No error signaling or no safe
values

0 FIT

0 FIT
Calculation according
IEC13849:2006 CAT4
Diagnostic Coverage 99.00 % –
Diagnostic test interval 15 ms Errors detected in each firmware
cycle
Safe Failure Fraction 99.86 % –
Common Cause Factor 2 % –
Controller
Parameter Value Comment
Hardware Fault Tolerance 1 –
Classification B –
Architecture 1oo2D 1st detected failure leads to the safe
state
Failure mode

detected

undetected
Dangerous process value

174,00 FIT

1,68 FIT
Due to failures in the processing unit

One channel

One channel
Failure Mode Diagnostic

Detected

Undetected
No error signaling or no safe
values

0 FIT

0 FIT
Calculation according
IEC13849:2006 CAT4
Diagnostic Coverage 99.04 % –
Diagnostic test interval 15 ms Errors detected in each firmware
cycle
Safe Failure Fraction 99.23 % –
Common Cause Factor 2 % –