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1 Publication 1794-RM001F-EN-P - September 2011
Chapter
2
ControlLogix Communications
This chapter discusses the communication modules used in a ControlLogix
SIL2 system.
ControlNet Bridge Module
The ControlNet bridge modules (1756-CNB & 1756-CNBR) provide for the
communications between ControlLogix and FLEX I/O system.
ControlNet Cabling
For remote racks, 802.3 compliant shielded or unshielded twisted pair cable is
required for EtherNet/IP. Although it is not a requirement to use redundant
media with the 1756-CNBR, it does provide higher system availability.
Redundant media is not required for SIL2 operation.
ControlNet Module Diagnostic Coverage
All communications over the passive ControlNet media occur via CIP, which
guarantees delivery of the data. All modules independently verify proper
transmission of the data.
EtherNet/IP Bridge Module
The EtherNet/IP bridge modules (1756-ENBT, 1756-EN2T, 1756-EN2TR,
and 1756-EN2TXT) provide for the communications between ControlLogix
and FLEX I/O system.
For information about: See page:
ControlNet Bridge Module 2-1
EtherNet/IP Bridge Module 2-1
Related Communications Modules
Documentation
2-3
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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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