Rockwell Automation 1794 FLEX I/O System with ControlLogix for SIL2 User Manual
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