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

Page 14

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Publication 1794-RM001G-EN-P - December 2011

1-10 SIL Policy

Table 1.3 FLEX I/O Product Probability of Undetected Dangerous Failure per Hour (PFH) Calculations (T

1

= 1

yr

)

Catalog Number

Description

Mean Time
Between Failure
(MTBF)

(1)

λ

(3)

Calculated PFH
1oo2 architecture

1794-ACN15

ControlNet Single Media Adapter

8,223,684

1.22E-07

8.64E-10

1794-ACNR15

ControlNet Redundant Media Adapter

8,223,684

1.22E-07

8.64E-10

1794-AENT

10/100Mb Ethernet Communication Adapter

691,134

1.45E-06

1.19E-08

1794-AENTR

10/100Mb Ethernet Redundant Communication Adapter 1,268,070

(2)

7.89E-07

6.05E-09

1794-IB10XOB6

10 Input/6 Output Module

4,943,442

2.02E-07

1.45E-09

1794-IB16

16 Sink Input Module

4,105,090

2.44E-07

1.76E-09

1794-IE8

Analog Input Module

37,952,679

2.63E-08

1.85E-10

1794-IF2XOF2I

Isolated Analog Input/Output Module

25,296,960

3.95E-08

2.78E-10

1794-IF4I

Isolated Analog Input Module

11,746,343

8.51E-08

6.02E-10

1794-IJ2

Frequency Counter Module

2,418,321

4.14E-07

3.04E-09

1794-IP4

Pulse Counter Module

2,375,360

4.21E-07

3.10E-09

1794-IR8

RTD Input Module

6,191,655

1.62E-07

1.15E-09

1794-IRT8

TC/RTD/mV Input Module

1,182,438

8.46E-07

6.53E-09

1794-IT8

Thermocouple Input Module

1,564,324

6.39E-07

4.82E-09

1794-OB16

16 Source Output Module

1,883,594

5.31E-07

3.96E-09

1794-OB16P

Protected Output Module

2,135,280

4.68E-07

3.47E-09

1794-OB8EP

Protected Output Module

2,389,669

(2)

4.18E-07

3.08E-09

1794-OE4

Analog Output Module

23,807,086

4.20E-08

2.96E-10

1794-OF4I

Isolated Analog Output Module

7,191,128

1.39E-07

9.90E-10

1794-OW8

Relay Output Module

14,766,876

6.77E-08

4.78E-10

1794-TB3

Terminal Base Units

21,128,346

(2)

4.73E-08

3.33E-10

1794-TB3G

Generic Terminal Base Units

27,320,800

3.66E-08

2.57E-10

1794-TB3GS

Generic Terminal Base Units

46,425,600

2.15E-08

1.51E-10

1794-TB3S

Terminal Base Unit

71,433,747

(2)

1.40E-08

9.82E-11

1794-TB3T

Temperature Terminal Base Units

73,096,226

(2)

1.37E-08

9.59E11

1794-TB3TS

Temperature Terminal Base Units

75,763,399

(2)

1.32E-08

9.25E-11

1794-TBN

Terminal Base Units

75,716,615

1.32E-08

9.26E-11

1794-TBNF

Fused Terminal Base Units

4,812,320

(2)

2.08E-07

1.49E-09

1794-ACNR15XT

ControlNet Redundant Media Adapte

8,223,684

1.22E-07

8.64E-10

1794-AENTRXT

10/100Mb Ethernet Redundant Communication Adapter 1,268,070

(2)

7.89E-07

6.05E-09

1794-OB8EPXT

8 Protected Output Module

14,771,049

6.77E-08

4.78E-10

1794-IB16XT

16 Sink Input Module

35,587,189

2.81E-08

1.97E-10

1794-OB16PXT

16 Protected Output Module

26,709,401

3.74E-08

2.63E-10

1794-IB10XOB6XT

10 Input/6 Output Combo Module

22,202,487

4.50E-08

3.17E-10

1794-OW8XT

8 Relay Output Module

18,518,519

5.40E-08

3.80E-10