Rockwell Automation Publication 1756-RM093J-EN-P - April 2018 95
Appendix E
GuardLogix Systems Safety Data
The following examples show probability of failure on demand (PFD) and
probability of failure per hour (PFH) values for GuardLogix® 1oo2 SIL 3 systems.
Mission time for GuardLogix controllers is 20 years.
For safety data, including PFD and PFH values for Guard I/O™ modules, see the
manuals for those products.
• POINT Guard I/O Safety Modules User Manual, publication
1734-UM013
• Guard I/O EtherNet/IP Safety Modules User Manual, publication
1791ES-UM001
• Guard I/O DeviceNet Safety Modules User Manual, publication
1791DS-UM001
Data for Rockwell Automation machinery safety products is now available in the
form of a library file to be used with the Safety Integrity Software Tool for the
Evaluation of Machine Applications (SISTEMA). The library file is available for
download at: http://www.marketing.rockwellautomation.com/safety-solutions/
en/MachineSafety/ToolsAndDownloads/sistema_download.
PFD Values
Table 15 - Calculated PFD by Proof Test Interval
Topic Page
PFD Values 95
PFH Values 96
Cat. No. Description
Calculated PFD
2 Years
(17,520 hours)
5 Years
(43,800 hours)
10 Years
(87,600 hours)
20 Years
(175,200 hours)
1756-L6xS and 1756-LSP GuardLogix Controller Not applicable 5.5E-06 1.2E-05
1768-L43S and 1768-L45S Compact GuardLogix Controller
1.1E-06
2.7E-06 5.7E-06 1.2E-05
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