Allen-Bradley 1794 - Analog Input Module; 1794-If4 I; Analog Output Module; Input Module

1 Publication 1794-RM001G-EN-P - December 2011
Appendix A
Failure Estimates
The following tables list the failure estimates for the FLEX I/O products
included in this manual for different proof test intervals.
Table A.1 MTBF Field Data and Per Module PFD Estimates - T
1
= 1 year
Catalog Number: Description:
(MTBF)
(1)
λ
(3)
Estimated PFD
1oo2
1794-ACN15 ControlNet Single Media Adapter 8,223,684 1.22E-07 2.15E-06
1794-ACNR15 ControlNet Redundant Media Adapter 8,223,684 1.22E-07 2.15E-06
1794-AENT 10/100Mb Ethernet Communication Adapter 691,134 1.45E-06 2.76E-05
1794-AENTR 10/100Mb Ethernet Redundant Communication Adapter 1,268,070 7.89E-07 1.45E-05
1794-IB10XOB6 10 Input/6 Output Module 4,943,442 2.02E-07 3.60E-06
1794-IB16 16 Sink Input Module 4,105,090 2.44E-07 4.34E-06
1794-IE8 Analog Input Module 37,952,679 2.63E-08 4.64E-07
1794-IF2XOF2I Isolated Analog Input/Output Module 25,296,960 3.95E-08 6.97E-07
1794-IF4I Isolated Analog Input Module 11,746,343 8.51E-08 1.50E-06
1794-IJ2 Frequency Counter Module 2,418,321 4.14E-07 7.45E-06
1794-IP4 Pulse Counter Module 2,375,360 4.21E-07 7.58E-06
1794-IR8 RTD Input Module 6,191,655 1.62E-07 2.87E-06
1794-IRT8 TC/RTD/mV Input Module 1,182,438 8.46E-07 1.56E-05
1794-IT8 Thermocouple Input Module 1,564,324 6.39E-07 1.17E-05
1794-OB16 16 Source Output Module 1,883,594 5.31E-07 9.62E-06
1794-OB16P Protected Output Module 2,135,280 4.68E-07 8.46E-06
1794-OB8EP Protected Output Module
2,389,669
(2)
4.18E-07 7.54E-06
1794-OE4 Analog Output Module 23,807,086 4.20E-08 7.41E-07
1794-OF4I Isolated Analog Output Module 7,191,128 1.39E-07 2.47E-06
1794-OW8 Relay Output Module 14,766,876 6.77E-08 1.20E-06
1794-TB3 Terminal Base Units
21,128,346
(2)
4.73E-08 8.35E-07
1794-TB3G Generic Terminal Base Units 27,320,800 3.66E-08 6.45E-07
1794-TB3GS Generic Terminal Base Units 46,425,600 2.15E-08 3.79E-07
1794-TB3S Terminal Base Unit
71,433,747
(2)
1.40E-08 2.46E-07
1794-TB3T Temperature Terminal Base Units
73,096,226
(2)
1.37E-08 2.41E-07
1794-TB3TS Temperature Terminal Base Units
75,763,399
(2)
1.32E-08 2.32E-07
1794-TBN Terminal Base Units 75,716,615 1.32E-08 2.32E-07
1794-TBNF Fused Terminal Base Units
4,812,320
(2)
2.08E-07 3.70E-06
1794-ACNR15XT ControlNet Redundant Media Adapter 8,223,684 1.22E-07 2.15E-06
AB Drives