Rockwell Automation Publication 1734-UM013N-EN-P - September 2017 201
Appendix D
Safety Data
This appendix lists calculated values for probability of failure on demand (PFD),
probability of failure per hour (PFH), and mean time to 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. Both 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 13849-1:2008, 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.
Additionally, you must individually toggle each output point by the controller
and user-verified that the output point changes state.
For more information, see 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.
To Next Page
Loading...
Need help?
General
