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Safety Figures
45
10/13 MN03402007Z-DE/EN
SIL Declaration of Conformity
Values in the safety and commissioning instructions for
70 °C ambient temperature.
Safety data for software revision no. 1.00.013.
Symbol
Value
Safety Integrity Level
SIL
1
Safety Integrity Assessment
Hardware Safety Integrity
Compliance as per route 1H
Software Safety Integrity
Compliance as per route 2s.
Hardware Fault Tolerance
HFT
0
Failure rate for detected safe failures
l
SD
1)
137 x 10
-9
1/h
Failure rate for undetected safe failures
l
SU
2)
2080 x 10
-9
1/h
Failure rate for detected dangerous failures
l
DD
3)
134 x 10
-9
1/h
Failure rate for undetected dangerous failures
l
DU
4)
876 x 10
-9
1/h
Safe Failure Fraction
SFF
73 %
Diagnostic Coverage
DC
13.25 %
Mean Time Before Failure
MTBF
309 885 h
Average probability of failure on demand
PFD
AVG
3.85 x 10
-3
Architecture
1001
T1 Value
DIN EN 60079-17, Section 4.4
Lifetime
20 years
Proof Test Interval
1 year
Systematic capacibility
SC
2
Failure Mode Definitions
1) Safe Detected: The overload relay software detects and change the contactor state for the random
hardware failures not impacting safety function performance.
2) Safe Undetected: The overload relay software may not detect the random hardware failures which
do not impact the safety function performance.
3) Dangerous Detected: The overload relay software detects and changes the contactor state for the
random hardware failure impacting safety function performance.
4) Dangerous Undetected: The overload relay software may not detect the random hardware failures
which may impact safety function performance.
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