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Publication 1794-RM001F-EN-P - September 2011
3-8 FLEX I/O Modules
The input’s OK bit preconditions a Timer run that is preset to
accommodate an acceptable fault response time and any communication
filtering lags in the system. If the inputs miscompare for longer than the
preset value, a fault is registered with a corresponding alarm.
Figure 3.7
The control, diagnostics and alarming functions must be performed in
sequence.
• Configuration parameters (for example, RPI, filter values) must be
identical between the two modules.
• The same controller must own both modules.
• Monitor the ControlNet status bits for the associated module and
ensure that appropriate action is invoked via the application logic by
these status bits.
• Wire sensors to separate input channels on two separate modules that
are on different ControlNet nodes.
Timer done
Timer
Inputs Faulted
Alarm to Operator
Inputs OK
SUB
Delta
Input 1
Low Limit
ADD
Delta
Input 1
High Limit
MULT
Range
Tolerance %
Delta
Inputs Faulted
LIM
Low Limit
Input 2
High Limit
Inputs OK
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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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