Rockwell Automation 1791DS-IBxxxx Guard I/O DeviceNet Safety Modules - Manual (Page 163)

Rockwell Automation Publication 1791DS-UM001J-EN-P - May 2013 163
Safety Data Appendix B
Table 36 - Probability of Failure Data (IEC 61508, Edition 2, 2010)
Table 37 - Probability of Failure Data (IEC 61508, Edition 1, 1999)
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) PFH
(1/hour) Spurious Trip
Rate (SPR) MTTF
(years)
1791DS-IB8XOBV4 CIP Safety 8-point
input/4 bi-polar
output module 4.16E-06 1.04E-05 2.08E-05 4.16E-05 5.02E-10 5.608E-06 20.34
1791DS-IB16 CIP Safety 16-point
input module 4.11E-06 1.03E-05 2.06E-05 4.11E-05 4.96E-10 3.301E-06 34.56
1732DS-IB8XOBV4 CIP Safety 8-point
input/4 bi-polar
output module 4.16E-06 1.04E-05 2.08E-05 4.16E-05 5.02E-10 5.608E-06 20.34
1732DS-IB8 CIP Safety 8-point
input module 4.11E-06 1.03E-05 2.06E-05 4.11E-05 4.96E-10 3.301E-06 34.56
Cat. No. Description Calculated PFD
2 Years
(17,520
hours) 5 Years
(43,800
hours) 10 Years
(87,600 hours) 20 Years
(1)
(175,200 hours)
PFH
(1/hour)
(1)
(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.
1791DS-IB12 CIP Safety 12-point
input module 1.754E-06 4.419E-06 8.962E-06 6.013E-06 6.84E-11
1791DS-IB8XOB8 CIP Safety 8-point
input/8-point output
module 1.755E-06 4.421E-06 8.963E-06 6.013E-06 6.84E-11
1791DS-IB4XOW4 CIP Safety 4-point
input/4-point relay
output module 4.151E-05 1.207E-04 2.978E-04 7.684E-04 4.072E-09