Rockwell Automation Publication 5069-UM004A-EN-P - April 2019 287
Appendix D
Safety Data for Safety 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 93 on page 288 for the
5069-IB8S and 5069-IB8SK modules and
Table 94 on page 289 for the 5069-
OBV8S and 5069-OBV8SK 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 are responsible for following the requirements of ISO 13849-1:20015, to
assess Performance Levels in your safety system.
You must functionally test every I/O module. To functionally test the modules,
complete the following tasks:
• Input points - Toggle every input point, and verify that the system
detects the input state change within the safety reaction time (SRT).
• Output points - Use the controller to toggle every output point, and
verify that the output point changes state.
SRT is a consideration of delays or latencies within the safety system.
For more information, see the GuardLogix® 5580 and Compact GuardLogix
5380 Controller Systems Safety Reference Manual (TÃœV), publication
1756-RM012.
Topic Page
Compact 5000 I/O Safety Input Module Safety Data 288
Compact 5000 I/O Safety Output Module Safety Data 289
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