Rockwell Automation Publication 5094-UM001C-EN-P - April 2019 163
Appendix D
Safety Data for I/O Modules
This appendix lists calculated values for probability of a dangerous failure on
demand (PFD), average frequency of a dangerous failure per hour (PFH), and
mean time to failure (MTTF). PFD and PFH calculations comply with
IEC61508, edition 2, 2010.
Calculated values of PFD and PFH appear in Table 43 on page 164
for the 5094-
IB16S and 5094-IB16SXT modules and Table 44 on page 164
for the 5094-
OB16S and 5094-OB16SXT modules. PFD and PFH must be calculated for the
devices within the system to comply with the SIL level that is required for
application.
You must be responsible for following the requirements of ISO 13849-1:2015,
to assess Performance Levels in their safety system.
You must functionally test every I/O module by individually toggling each input
point and also verify that the controller detects it within the safety reaction time
(SRT). Additionally, you must individually toggle each output point by the
controller and user-verify that the output point changes state.
For more information, refer to the safety controller manuals listed in Additional
Resources on page 12.
STATUS
POWER
SAFETY DIGITAL 16 INPUT 24 VDC
5094-IB16S
5
5
TB3I
FLEX 5000
TM
I/O
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
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