Rockwell Automation 1791ES-IB16 Guard I/O EtherNet/IP Safety Modules - Manual (Page 91)

Rockwell Automation Publication 1791ES-UM001D-EN-P - May 2013 91
Appendix
B
Safety Data
This appendix lists calculated values for probability of failure on demand (PFD),
probability of failure per hour (PFH), and mean time between failure (MTTF).
PFD and PFH calculations comply with IEC61508, edition 2, 2010.
Calculated values of probability of failure on demand and probability of failure
per hour appear in the
Table 27 and must be calculated for the devices within the
system to comply with the SIL level required for application.
Users must be responsible for following the requirements of ISO 13849-1:2008,
to assess performance levels in their safety system.
Within the proof test interval, every I/O module must be functionally tested by
individually toggling each input point and verifying that it is detected by the
controller.
Additionally, each output point must be individually toggled by the controller
and user-verified that the output point changes state.
For more information, refer to these publications.
Resource Description
GuardLogix 5570 Controller Systems Safety Reference
Manual, publication
1756-RM099
Provides information on safety application requirements
for GuardLogix 5570 controllers in Studio 5000 Logix
Designer projects.
GuardLogix Controller Systems Safety Reference Manual,
publication
1756-RM093
Provides information on safety application requirements
for GuardLogix 5560 and 5570 controllers in RSLogix 5000
projects.