192 Rockwell Automation Publication 5094-UM001E-EN-P - April 2020
Appendix D Safety Data for I/O Modules
FLEX 5000 I/O Safety Input
Module Safety Data
Tab le 68 lists the safety data for the 5094-IB16S and 5094-IB16SXT modules.
Table 68 - 5094-IB16S and 5094-IB16SXT Digital Safety Parameter Data
Attribute
Point Operation Type
Single Channel Dual Channel
(at controller
instruction)
Total Failure Rate (λ (safety related)) 1.246E-06 1.397E-06
Safe Failure Fraction (SFF) 99.969% 99.967%
Safe Failure Rate (λS) 7.97E-07 8.63E-07
Diagnostic Coverage (DC) 99.867% 99.913%
Safe Detected Failure Rate (λSD) 7.96E-07 8.62E-07
Safe Undetected Failure Rate (λSU) 1.06E-09 7.53E-10
Dangerous Failure Rate (λD) 4.4950E-07 5.3402E-07
Dangerous Detected Failure Rate (λDD) 4.4890E-07 5.3356E-07
Dangerous Undetected Failure Rate (λDU) 3.81E-10 4.6619E-10
Diagnostic Test Interval (hours) 4 4
Hardware Fault Tolerance (HFT) 0 1
Spurious Trip Rate (STR) 5.40 E-06 —
Mean Time to Failure, Spurious (MTTF-spurious), (hours) 185068 —
PFH (1/hours) 3.81E-10 4.6619E-10
PFD
AVE
, at Mission Time of 20 years 3.34E-05 4.08E-05
Safety Reaction Time (SRT), (millisecond) 6 6
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