Allen-Bradley 1794-IE8H Specifications Page 14
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Publication 1794-RM001F-EN-P - September 2011
SIL Policy 1-9
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
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 1.2 FLEX I/O Product Probability of Failure on Demand (PFD) Calculations (T
1
= 1
yr
)
Catalog Number Description Mean Time
Between Failure
(MTBF)
(1)
λ
(3)
Calculated PFD
1oo2 architecture
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- 1
- Catalog Number Bulletin 1794 2
- Reference Manual 2
- Important User Information 3
- Introduction 4
- Manual Set-Up 4
- Understanding Terminology 4
- Preface 2 5
- SIL Policy 6
- SIL2 Certification 7
- Proof Tests 8
- IMPORTANT 9
- SIL2-Certified FLEX I/O 10
- System Components 10
- 1-6 SIL Policy 11
- SIL Policy 1-7 12
- Hardware Designs and 13
- Firmware Functions 13
- Difference Between PFD 13
- SIL Policy 1-9 14
- 1-10 SIL Policy 15
- SIL Policy 1-11 16
- SIL Compliance 18
- Distribution and Weight 18
- Response Times 18
- 1-14 SIL Policy 19
- ControlLogix Communications 20
- Module Fault Reporting for 21
- Related Communications 22
- Modules Documentation 22
- FLEX I/O Modules 23
- Using Digital 24
- Input Modules 24
- Wiring FLEX I/O Digital 25
- Figure 3.4 26
- Output Modules 27
- Relay Module 28
- Using Analog Input 29
- Figure 3.7 30
- Wiring FLEX I/O Analog 31
- 3-10 FLEX I/O Modules 32
- Wiring the RTD Input Module 34
- Using Analog Output 35
- Monitoring input 36
- FLEX I/O Modules 3-15 37
- Checklist for SIL Inputs 40
- Checklist for SIL Outputs 41
- 3-20 FLEX I/O Modules 42
- General Requirements for 43
- Application Software 43
- Application Program 45
- Failure Estimates 47
- A-2 Failure Estimates 48
- Failure Estimates A-3 49
- A-4 Failure Estimates 50
- Failure Estimates A-5 51
- A-6 Failure Estimates 52
- Failure Estimates A-7 53
- A-8 Failure Estimates 54
- Failure Estimates A-9 55
- A-10 Failure Estimates 56
- 2 Index 58
- Rockwell Automation Support 61
- Documentation Feedback 61
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