Rockwell Automation 1794 FLEX I/O System with ControlLogix for SIL2 - Manual (Page 48)

Publication 1794-RM001G-EN-P - December 2011
A-2 Failure Estimates
1794-AENTRXT 10/100Mb Ethernet Redundant Communication Adapter 1,268,070 7.89E-07 1.45E-05
1794-OB8EPXT 8 Protected Output Module 14,771,049 6.77E-08 1.20E-06
1794-IB16XT 16 Sink Input Module 35,587,189 2.81E-08 4.95E-07
1794-OB16PXT 16 Protected Output Module 26,709,401 3.74E-08 6.60E-07
1794-IB10XOB6XT 10 Input/6 Output Combo Module 22,202,487 4.50E-08 7.94E-07
1794-OW8XT 8 Relay Output Module 18,518,519 5.40E-08 9.53E-07
1794-IE4XOE2XT 4 Input/2 Output Analog Combo Module 11,800,802 8.47E-08 1.50E-06
1794-IE8XT 8 Input analog Module 14,041,000 7.12E-08 1.26E-06
1794-OE4XT 4 Output Analog Module 11,381,744 8.79E-08 1.55E-06
1794-IF2XOF2IXT 2 Input/2 Output Isolated Analog Combo Module 6,317,918 1.58E-07 2.81E-06
1794-IF4IXT 4 Isolated Input Analog Module 7,297,140 1.37E-07 2.43E-06
1794-IF4ICFXT 4 Isolated Input Analog Module 7,297,140 1.37E-07 2.43E-06
1794-OF4IXT 4 Isolated Output Analog Module 5,493,902 1.82E-07 3.24E-06
1794-IJ2XT 2 Ch. Frequency Counter Module 11,714,128 8.54E-08 1.51E-06
1794-IRT8XT 8 TC/RTD Input Analog Module 8,204,792 1.22E-07 2.16E-06
(1) MTBF measured in hours.
(2) Calculated using field-based values for components
(3) λ
= Failure Rate = 1 / MTBF
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
Table A.2 MTBF Field Data and Per Module PFD Estimates - T
1
= 2 years
Catalog Number: Description:
(MTBF)
(1) λ (3) Estimated
PFD 1oo2
1794-ACN15 ControlNet Single Media Adapter 8,223,684 1.22E-07 4.33E-06
1794-ACNR15 ControlNet Redundant Media Adapter 8,223,684 1.22E-07 4.33E-06
1794-AENT 10/100Mb Ethernet Communication Adapter 691,134 1.45E-06 5.92E-05
1794-AENTR 10/100Mb Ethernet Redundant Communication Adapter 1,268,070 7.89E-07 3.02E-05
1794-IB10XOB6 10 Input/6 Output Module 4,943,442 2.02E-07 7.27E-06
1794-IB16 16 Sink Input Module 4,105,090 2.44E-07 8.79E-06
1794-IE8 Analog Input Module 37,952,679 2.63E-08 9.28E-07
1794-IF2XOF2I Isolated Analog Input/Output Module 25,296,960 3.95E-08 1.39E-06
1794-IF4I Isolated Analog Input Module 11,746,343 8.51E-08 3.02E-06
1794-IJ2 Frequency Counter Module 2,418,321 4.14E-07 1.52E-05
1794-IP4 Pulse Counter Module 2,375,360 4.21E-07 1.55E-05
1794-IR8 RTD Input Module 6,191,655 1.62E-07 5.77E-06
1794-IRT8 TC/RTD/mV Input Module 1,182,438 8.46E-07 3.26E-05