Allen-Bradley 1794 - Page 50

Publication 1794-RM001G-EN-P - December 2011
A-4 Failure Estimates
Table A.3 MTBF Field Data and Per Module PFD Estimates - T
1
= 5 years
Catalog Number: Description:
(MTBF)
(1)
λ
(3)
Estimated
PFD 1oo2
1794-ACN15 ControlNet Single Media Adapter 8,223,684 1.22E-07 1.10E-05
1794-ACNR15 ControlNet Redundant Media Adapter 8,223,684 1.22E-07 1.10E-05
1794-AENT 10/100Mb Ethernet Communication Adapter 691,134 1.45E-06 1.79E-04
1794-AENTR 10/100Mb Ethernet Redundant Communication Adapter 1,268,070 7.89E-07 8.47E-05
1794-IB10XOB6 10 Input/6 Output Module 4,943,442 2.02E-07 1.88E-05
1794-IB16 16 Sink Input Module 4,105,090 2.44E-07 2.28E-05
1794-IE8 Analog Input Module 37,952,679 2.63E-08 2.33E-06
1794-IF2XOF2I Isolated Analog Input/Output Module 25,296,960 3.95E-08 3.50E-06
1794-IF4I Isolated Analog Input Module 11,746,343 8.51E-08 7.64E-06
1794-IJ2 Frequency Counter Module 2,418,321 4.14E-07 4.05E-05
1794-IP4 Pulse Counter Module 2,375,360 4.21E-07 4.13E-05
1794-IR8 RTD Input Module 6,191,655 1.62E-07 1.48E-05
1794-IRT8 TC/RTD/mV Input Module 1,182,438 8.46E-07 9.19E-05
1794-IT8 Thermocouple Input Module 1,564,324 6.39E-07 6.62E-05
1794-OB16 16 Source Output Module 1,883,594 5.31E-07 5.36E-05
1794-OB16P Protected Output Module 2,135,280 4.68E-07 4.65E-05
1794-OB8EP Protected Output Module
2,389,669
(2)
4.18E-07 4.10E-05
1794-OE4 Analog Output Module 23,807,086 4.20E-08 3.73E-06
1794-OF4I Isolated Analog Output Module 7,191,128 1.39E-07 1.27E-05
1794-OW8 Relay Output Module 14,766,876 6.77E-08 6.05E-06
1794-TB3 Terminal Base Units
21,128,346
(2)
4.73E-08 4.21E-06
1794-TB3G Generic Terminal Base Units 27,320,800 3.66E-08 3.24E-06
1794-TB3GS Generic Terminal Base Units 46,425,600 2.15E-08 1.90E-06
1794-TB3S Terminal Base Unit
71,433,747
(2)
1.40E-08 1.23E-06
1794-TB3T Temperature Terminal Base Units
73,096,226
(2)
1.37E-08 1.20E-06
1794-TB3TS Temperature Terminal Base Units
75,763,399
(2)
1.32E-08 1.16E-06
1794-TBN Terminal Base Units 75,716,615 1.32E-08 1.16E-06
1794-TBNF Fused Terminal Base Units
4,812,320
(2)
2.08E-07 1.93E-05
1794-ACNR15XT ControlNet Redundant Media Adapter 8,223,684 1.22E-07 1.10E-05
1794-AENTRXT 10/100Mb Ethernet Redundant Communication Adapter 1,268,070 7.89E-07 8.47E-05
1794-OB8EPXT 8 Protected Output Module 14,771,049 6.77E-08 6.05E-06
1794-IB16XT 16 Sink Input Module 35,587,189 2.81E-08 2.48E-06
1794-OB16PXT 16 Protected Output Module 26,709,401 3.74E-08 3.32E-06