Eaton ZEB Series - SIL Declaration of Conformity

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.