Rockwell Automation 1791DS-IBxxxx Guard I/O DeviceNet Safety Modules - Manual (Page 161)

Rockwell Automation Publication 1791DS-UM001J-EN-P - May 2013 161
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 failures. 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
Table 36 and Table 37 and must be calculated for the devices
within the system to comply with the SIL level required for application.
You must be responsible for following the requirements of ISO 13849-1:2008, to
assess performance levels in your safety system.
Within the proof test interval, every I/O module must be functionally tested by
individually toggling each input point and verifying that each point is detected by
the controller.
Additionally, each output point must be individually toggled by the controller
and you must verify 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.