User manual

102 Publication 1756-RM093F-EN-P - January 2010
Appendix E Probability of Failure on Demand (PFD) and Probability of Failure per Hour (PFH) Data
PFD Values
Calculated PFD by Functional Test Interval
PFH Values
The data below applies to proof test intervals up to and including
20 years.
PFH Calculations
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
1791DS-IB12 CIP Safety 12-point input module 1.754E-06 4.419E-06 8.962E-06
6.013E-06
(1)
1791DS-IB16 CIP Safety 16-point input module 1.70E-06 4.25E-06 8.50E-06 1.70E-05
1791DS-IB8XOB8 CIP Safety 8-point input/ 8-point output module 1.755E-06 4.421E-06 8.963E-06
6.013E-06
(1)
1791DS-IB4XOW4 CIP Safety 4-point input/4-point relay output
module
4.151E-05 1.207E-04 2.978E-04
7.684E-04
(1)
1791DS-IB8XOBV4 CIP Safety 8-point input/4 bi-polar output module 1.75E-06 4.37E-06 8.74E-06 1.75E-05
1732DS-IB8XOBV4
1732DS-IB8 CIP Safety 8-point input module 1.70E-06 4.25E-06 8.50E-06 1.70E-05
1791ES-IB16 CIP Safety 16-point input module 1.65E-06 4.14E-06 8.27E-06 1.65E-05
1791ES-IB8XOBV4 CIP Safety 8-point input/4 bi-polar output module 1.70E-06 4.26E-06 8.51E-06 1.70E-05
1734-IB8S CIP Safety 8-point input module 1.17E-06 2.93E-06 5.86E-06 1.17E-05
1734-OB8S CIP Safety 8-point output module 1.21E-06 3.03E-06 6.06E-06 1.21E-05
(1) The 20-year PFD data for this product applies only to product with a manufacture date code
of 2009/01/01 (January 1, 2009) or later. See the product label for the date code.
Cat. No. Description PFH (1/Hour)
1756-L6xS and 1756-LSP GuardLogix controller 2.0E-10
1768-L43S and 1768-L45S Compact GuardLogix controller 2.0E-10
1791DS-IB12 CIP Safety 12-point input module
6.84E-11
(1)
1791DS-IB16 CIP Safety 16-point input module 1.94E-10
1791DS-IB8XOB8 CIP Safety 8-point input/ 8-point output module
6.84E-11
(1)
1791DS-IB4XOW4 CIP Safety 4-point input/4-point relay output module
4.072E-09
(1)
1791DS-IB8XOBV4 CIP Safety 8-point input/4 bi-polar output module 2.00E-10
1732DS-IB8XOBV4
1732DS-IB8 CIP Safety 8-point input module 1.94E-10
1791ES-IB16 CIP Safety 16-point input module 1.89E-10
1791ES-IB8XOBV4 CIP Safety 8-point input/4 bi-polar output module 1.94E-10
1734-IB8S CIP Safety 8-point input module 1.34E-10
1734-OB8S CIP Safety 8-point output module 1.38E-10
(1) The PFH data for this product applies only to product with a manufacture date code of 2009/01/01 (January 1, 2009) or later. See the product label for the date code.