2-6
Safety performance
SG-ONE can be used in a system for category B to 4 and performance level “a” to “e” in
accordance with ISO 13849-1: 2006.
Average probability of failure on demand (PFD) and Probability of a dangerous failure
per hour (PFH)
The following table describes PFD and PFH. They are needed for calculation of safety integrity
level (SIL) which is applied to a system with SG-ONE. SG-ONE can be used in a system for SIL
1 to 3.
Proof test interval
Note1
Average Probability of Failure
on Demand (PFD)
Probability of a dangerous Failure per
Hour (PFH)
6 months
< 1.8 x 10
-5
1 year
< 3.1 x 10
-5
2 years
< 5.7 x 10
-5
5 years
< 13.4 x 10
-5
< 1.2 x 10
-8
Note1: Refer to Maintenance and Inspection in “Chapter 7 APPENDIX” for proof test procedure.
Mean Time To dangerous Failure (MTTF
d
) and diagnostic coverage (DC)
The following table describes MTTF
d
and DC. They are needed for the calculation of
Performance Level (PL) which is applied to a system with SG-ONE. SG-ONE can be used in a
system for PL a to e.
Mean time to dangerous failure (MTTF
d
)
Average Diagnostic Coverage (DC)
100 years
99% or more
Summary of Contents for SG EASY One
Page 1: ...Safety Control Unit INSTRUCTION MANUAL...
Page 34: ......
Page 70: ...5 28 Using an DATALOGIC AUTOMATION light curtain SE series as S1 S2...
Page 71: ...5 29 Timing chart Logic 3...
Page 74: ...5 32 Logic circuit Logic 4...
Page 80: ...5 38 Timing chart Logic 4...
Page 81: ...5 39...
