Rockwell Automation Allen-Bradley 1715-AENTR User manual

Redundant I/O System
Catalog Numbers 1715-AENTR, 1715-IB16D, 1715-OB8DE,
1715-IF16, 1715-OF8I
User Manual Original Instructions

2Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
Redundant I/O System User Manual
Important User Information
Read this document and the documents listed in the additional resources section about installation, configuration, and
operation of this equipment before you install, configure, operate, or maintain this product. Users are required to familiarize
themselves with installation and wiring instructions in addition to requirements of all applicable codes, laws, and standards.
Activities including installation, adjustments, putting into service, use, assembly, disassembly, and maintenance are required to
be carried out by suitably trained personnel in accordance with applicable code of practice.
If this equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be
impaired.
In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages resulting from the use
or application of this equipment.
The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many variables and
requirements associated with any particular installation, Rockwell Automation, Inc. cannot assume responsibility or liability for
actual use based on the examples and diagrams.
No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits, equipment, or software
described in this manual.
Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell Automation, Inc., is
prohibited.
Throughout this manual, when necessary, we use notes to make you aware of safety considerations.
Labels may also be on or inside the equipment to provide specific precautions.
WARNING: Identifies information about practices or circumstances that can cause an explosion in a hazardous environment,
which may lead to personal injury or death, property damage, or economic loss.
ATTENTION: Identifies information about practices or circumstances that can lead to personal injury or death, property
damage, or economic loss. Attentions help you identify a hazard, avoid a hazard, and recognize the consequence.
IMPORTANT Identifies information that is critical for successful application and understanding of the product.
SHOCK HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that dangerous
voltage may be present.
BURN HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that surfaces may
reach dangerous temperatures.
ARC FLASH HAZARD: Labels may be on or inside the equipment, for example, a motor control center, to alert people to
potential Arc Flash. Arc Flash will cause severe injury or death. Wear proper Personal Protective Equipment (PPE). Follow ALL
Regulatory requirements for safe work practices and for Personal Protective Equipment (PPE).

Rockwell Automation Publication 1715-UM001J-EN-P - December 2020 3
Table of Contents
Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
About This Publication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Before You Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Required Software. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Download Firmware, AOP, EDS, and Other Files . . . . . . . . . . . . . . . . . . . 11
Summary of Changes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Chapter 1
Redundancy System Overview Redundant 1715 Adapters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1715 I/O Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1715 I/O Modules in SIL 2 Applications . . . . . . . . . . . . . . . . . . . . . . . . . 14
System Architecture. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Termination Assemblies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Base Unit Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
1715-AENTR Adapters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
I/O Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Module Positioning in the 1715 Redundant I/O System . . . . . . . . . . 15
Layout the Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
System Context . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Simplex Architecture. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Duplex Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Mixed Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Bus Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Switchover Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Obtaining a New IP Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Ethernet Topology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Communication on the EtherNet/IP Network . . . . . . . . . . . . . . . . . . 28
System Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Input / Output Traffic Prioritization. . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
RPI. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Connection and Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Timestamping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Chapter 2
Installation Instructions Environment and Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Prevent Electrostatic Discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
European Hazardous Location Approval . . . . . . . . . . . . . . . . . . . . . . . 33
Multi-point Network Communication Connections. . . . . . . . . . . . . 34
Field-side Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Removal and Insertion Under Power (RIUP) Fuses. . . . . . . . . . . . . . 34
North American Hazardous Location Approval . . . . . . . . . . . . . . . . . 35

4Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
Before You Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Ensure that Warranty is Not Compromised . . . . . . . . . . . . . . . . . . . . 36
Graphical Representation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Required Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Spacing Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
System Hardware Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
1715-AENTR Adapter Redundant Pair . . . . . . . . . . . . . . . . . . . . . . . . . . 38
1715 Digital and Analog I/O Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . 39
1715-A2A Adapter Base Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
1715-A3IO I/O Base Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
I/O Termination Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
1715-C2 Expansion Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
1715-N2T and 1715-N2S Slot Filler Covers . . . . . . . . . . . . . . . . . . . . . . . 50
Power Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Cooling Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Heating Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Specify an Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
System Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Module Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Base Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Install Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Step 1: Enclosure DIN Rail Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Step 2: Build the System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Product Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
DIN Rail Mounting Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
DIN Rail Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Component Size and Weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Install the Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Install the Adapter Base Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Install the I/O Base Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Install Termination Assembly to I/O Base Unit. . . . . . . . . . . . . . . . . . . . . 64
Mount Termination Assemblies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Mount I/O Expansion Cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Cable Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Expansion Cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Install Expansion Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Wire the Adapter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Connect the 24V DC System Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Wire the Ground Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Connect Field Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Recommended Circuits for Digital Inputs. . . . . . . . . . . . . . . . . . . . . . 75
Recommended Circuits for Digital Outputs . . . . . . . . . . . . . . . . . . . . 80
1715-OB8DE Digital Output Module FBD. . . . . . . . . . . . . . . . . . . . . . . 82
Recommended Circuits for Analog Inputs . . . . . . . . . . . . . . . . . . . . . 86
Recommended Wiring for Analog Output Modules . . . . . . . . . . . . . 94
Connect the Adapter to the Ethernet Network . . . . . . . . . . . . . . . . . . . . . 96
Module Keying. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Verify Coding Pegs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Electronic Keying . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

Rockwell Automation Publication 1715-UM001J-EN-P - December 2020 5
More Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Install the Adapters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Assign an IP Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Step 1: Assign an IP Address on the BOOTP/DHCP Server . . . . . . 105
Step 2: Configure the Module with RSLinx Classic Software . . . . 108
Install the I/O Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Install Slot Filler Covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Remove Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Chapter 3
Security Protected Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Strategy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Web-Server Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Enable / Disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Chapter 4
Digital I/O Operation 1715 Digital Module Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
1715-IB16D Digital Input Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
1715-OB8DE Digital Output Module . . . . . . . . . . . . . . . . . . . . . . . . . . 118
Common Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Determining Input Module Compatibility . . . . . . . . . . . . . . . . . . . . . . . . 119
Termination Assemblies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Determining Output Module Compatibility . . . . . . . . . . . . . . . . . . . . . . 120
Termination Assemblies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Using Features Common to 1715 Standard Digital I/O Modules . . . . . 120
Removal and Insertion Under Power (RIUP) . . . . . . . . . . . . . . . . . . 120
Module Fault Reporting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Fully Software Configurable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Module Inhibiting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Status Indicator Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Features Specific to 1715-IB16D Digital Input Modules . . . . . . . . . . . . . 122
Data Transfer on Either Cyclic Time or Change of State . . . . . . . . 122
Set RPI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Enable Change of State. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Field-side Diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
Features Specific to 1715-OB8DE Digital Output Modules . . . . . . . . . . 124
Field Power Status Integers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Field Fault Detection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Configurable Point-level Output Fault States . . . . . . . . . . . . . . . . . . 127
Output Data Echo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Fusing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Diagnostic Latch Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Shutdown State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
Energize-on-communication-failure . . . . . . . . . . . . . . . . . . . . . . . . . 131
De-energize-to-trip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Disable Line Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Fault and Status Reporting between Input Modules
and Controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

6Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
Fault and Status Reporting between Output Modules
and Controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
Chapter 5
Using 1715 Analog I/O
Module Features
1715 Analog Module Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
1715-IF16 Analog Input Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
1715-OF8I Analog Output Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Features Common to All
Analog I/O Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Removal and Insertion Under Power (RIUP) . . . . . . . . . . . . . . . . . . 137
Module Fault Reporting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
Fully Software Configurable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
Status Indicator Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
Module Inhibiting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
Scaling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Online Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
Offline Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
Shutdown Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
Ready Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
Run Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
Shutdown States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
HART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
HART Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
Configuration of HART Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
Precautions for HART in a Safety System . . . . . . . . . . . . . . . . . . . . . 142
Configure HART for Field Device Monitoring . . . . . . . . . . . . . . . . . 142
AB:1715_ChCHART_Struc. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
HART Pass-Through. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
Using HART Pass-Through . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
HART Pass-Through Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
Precautions for HART Pass-Through in a Safety System . . . . . . . . 147
Installing the 1715-DTM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
Updating the Asset Management System DTM Catalogue . . . . . . 149
Enable HART Pass-Through in the Controller . . . . . . . . . . . . . . . . . 150
Using Factory Talk Asset Center with Analog Modules. . . . . . . . . . 150
1715-DTM Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
1715-DTM HART Diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
Chapter 6
Configure the Redundant I/O
System
Before You Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
Install the Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
Install the Add-on Profiles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
Product Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Installation of product, this is achieved using the PCDC Website 158
EDS Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Create the Project in RSLogix 5000 or Studio 5000 Logix Designer. . 160
Step 1: Create the New Project . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
Step 2: Configure the Controller in the Project. . . . . . . . . . . . . . . . . 162

Rockwell Automation Publication 1715-UM001J-EN-P - December 2020 7
Step 3: Add a 1756-EN2TR Module to the Project . . . . . . . . . . . . . . . 163
Add the 1715-AENTR Adapter to the I/O Configuration Tree . . . . . . . . 165
Step 1: Configure the Adapter for the EtherNet/IP Network. . . . . 165
Options for Setting the IP Addresses of 1715-AENTR Modules . . . 165
Ethernet Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
Step 2: Add the 1715-AENTR Adapter to the Project . . . . . . . . . . . . . 166
Obtaining System Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
1715-IB16D Digital Input Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
Add the Digital Input Module to the Project . . . . . . . . . . . . . . . . . . . 177
Step 1: Add the Digital Input Module in Duplex Mode . . . . . . . . . . 177
Step 2: Add the Digital Input Module in Simplex Mode . . . . . . . . . 182
1715-OB8DE Digital Output Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
Step 1: Add the Digital Output Module in Duplex Mode. . . . . . . . . 185
Step 2: Add the Digital Output Module in Simplex Mode . . . . . . . 187
1715-IF16 Analog Input Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189
Add the Analog Input Module to the Project . . . . . . . . . . . . . . . . . . . 189
Step 1: Add the Analog Input Module in Duplex Mode . . . . . . . . . . 189
Step 2: Add the Analog Input Module in Simplex Mode . . . . . . . . . 192
1715-OF8I Analog Output Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193
Add the Analog Output Module to the project. . . . . . . . . . . . . . . . . . 193
Step 1: Add the Analog Output Module in Duplex Mode. . . . . . . . . 193
Step 2: Add the Analog Output Module in Simplex Mode . . . . . . . 198
Chapter 7
1715 Redundant I/O System in
SIL 2 Safety Applications
SIL 2 Safety Application Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . 201
1715 I/O Modules in SIL 2 Safety Applications . . . . . . . . . . . . . . . . . . . . . 202
Typical Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
Internal Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
Requirements for Using 1715 I/O Modules . . . . . . . . . . . . . . . . . . . . . . . . 207
Energize-to-action Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
Requirements for ControlLogix-based SIL 2 Applications . . . . . . . . . . 208
Add-On Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
Connection Reaction Time Limit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
Using the 1715 Adapter in SIL 2 Applications . . . . . . . . . . . . . . . . . . . . . . 208
Reaction to Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
Using 1715 I/O Modules in SIL 2 Applications . . . . . . . . . . . . . . . . . . . . . 209
Input Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
Considerations for Sensor and Actuator Configurations . . . . . . . . . . . 212
Configure SIL 2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
Enable SIL 2 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
Specify the Connection Reaction Time Limit and Requested Packet
Interval. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
Set Safe State Values for Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215
Check SIL 2 Reset Status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216
View Module Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216
Diagnostic Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216
Reaction Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217
System Reaction Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217

8Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
Logix System Reaction Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217
Configuring the SIL 2 Task Period and Watchdog . . . . . . . . . . . . . . . . . 218
SIL Task/Program Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218
Configuring the Output Module Program/Fault Actions. . . . . . . . 219
Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220
Chapter 8
Using SIL 2 Add-On Instructions
with 1715 Redundant I/O Modules
SIL 2 Add-On Instructions Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221
SIL 2 Check Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224
Add-On Instruction Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225
Add-On Instruction Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226
Download and Import the Add-On Instructions. . . . . . . . . . . . . . . . . . . 227
Import Add-On Instructions to Upgraded Projects. . . . . . . . . . . . . 227
Create a Periodic Task for SIL 2 Safety Functions . . . . . . . . . . . . . . . . . 228
1715 SIL 2 Periodic Task ‘Period’ Configuration . . . . . . . . . . . . . . . . 228
Configure an Input Module Add-On Instruction . . . . . . . . . . . . . . . . . . 230
Configure an Output Module Add-On Instruction. . . . . . . . . . . . . . . . . 233
Add-On Instruction Scan Times. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235
Safety Reaction Time Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . 236
Using the Add-On Instruction Data Tags in an Application Program 237
Performing a SIL 2 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238
Chapter 9
Redundant I/O System
Diagnostics
Diagnostic Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241
Appendix A
Status Indicators Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245
System Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245
Module Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245
Channel Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 246
Field Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 246
User Application Fault Indications and Logging . . . . . . . . . . . . . . . 246
Troubleshooting Faults. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 246
1715 Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247
Reset Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250
1715 Digital Input Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250
1715 Digital Output Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252
1715 Analog Input Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253
1715 Analog Output Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255
Appendix B
1715-IB16D Digital Input Module
Diagnostics
Threshold Values for Digital Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257
Threshold Diagnostics Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258
Calculate Threshold and Resistor Values . . . . . . . . . . . . . . . . . . . . . . . . . 261
Calculate the Voltage for Off/On Conditions for Threshold Values. .
261
Calculate On/Off Condition for Resistor Values. . . . . . . . . . . . . . . . 265
Calibration Drift Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 267

Rockwell Automation Publication 1715-UM001J-EN-P - December 2020 9
Appendix C
Reconfigure a Module Online Use Ladder Logic to Reconfigure an I/O Module . . . . . . . . . . . . . . . . . . 269
Reconfigure a Module Via Studio 5000 Logix Designer Application.
269
Reconfigure a Module Via Ladder Logic. . . . . . . . . . . . . . . . . . . . . . . 270
Appendix D
PFD and PFH Calculations for a
SIL 2 System
About PFD and PFH Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273
Determine Which Values to Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273
Calculations for 1715 I/O Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273
PFD Calculations with 24-hour MTTR . . . . . . . . . . . . . . . . . . . . . . . . 274
Communications Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276
Appendix E
SIL 2 Applications Checklist 1715 I/O Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277
Appendix F
I/O Tag Definitions 1715-AENTR Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279
1715-IB16D. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280
1715-OB8DE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 282
1715-IF16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 284
1715-OF8I. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 285
Appendix G
History of Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291

10 Rockwell Automation Publication 1715-UM001J-EN-P - December 2020

Rockwell Automation Publication 1715-UM001J-EN-P - December 2020 11
Preface
About This Publication This manual explains how to install and configure the 1715 Redundant I/O
System. This redundant, modular system is designed to work with a
ControlLogix® Enhanced Redundancy System. This system provides fault
tolerant I/O and redundancy for use in critical process applications.
This manual is intended for the following individuals, who:
• Understand how to configure and use a ControlLogix System, and a
ControlLogix Enhanced Redundancy System
• Understand how to configure remote devices on an Ethernet/IP
network.
Before You Begin Before you begin using your 1715 Redundant I/O System, verify that you have
the software that is required to install and configure your system.
Required Software
This list identifies the minimum software versions that are required to use
your 1715 Redundant I/O System:
• Either RSLogix 5000® or Studio 5000® software
• RSLogix 5000 programming software, version 20
Non-SIL 2 applications using revision 2.x of 1715 can use version 19
• RSLogix 5000 requires Microsoft Windows Vista; Microsoft Windows
7, 32- and 64-bit; and Microsoft Windows 2003 Server operating
systems
• Studio 5000 environment version 21 or later
• Studio 5000 requires Microsoft Windows Vista; Microsoft Windows 7,
32- and 64-bit; and Microsoft Windows 2003 Server operating systems
• ControlFLASH™ software version 13.00.00 or later
• Adapter Add-on Profile at rok.auto/pcdc.
• I/O Modules Add-on Profile at rok.auto/pcdc.
• Add-on Instructions at rok.auto/pcdc.
Download Firmware, AOP,
EDS, and Other Files
Download firmware, associated files (such as AOP, EDS, and DTM), and access
product release notes from the Product Compatibility and Download Center at
rok.auto/pcdc.
Summary of Changes This publication contains the following new or updated information. This list
includes substantive updates only and is not intended to reflect all changes.
ATTENTION: ControlLogix L7 controllers are certified in RSLogix 5000
version 20 or later for SIL 2 operations. See the latest certifications for
software and firmware at rok.auto/certifications. See the TÜV website
at http://www.tuvasi.com for SIL 2 certification listings.

12 Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
Additional Resources These documents contain additional information concerning related products
from Rockwell Automation.
You can view or download publications at rok.auto/literature.
Topic Page
PFD Calculations with 24-hour MTTR 274
Applied latest publication template
Resource Description
1715 Redundant I/O System Technical Specifications, publication 1715-TD001 Provides technical specifications for components of the 1715 Redundant I/O System.
EtherNet/IP Network Configuration User Manual, publication ENET-UM001 Describes how you can use EtherNet/IP modules with your Logix 5000™ controller and
communicate with various devices on the Ethernet network.
ControlLogix Enhanced Redundancy System, publication 1756-UM535 Provides design and configuration information for a ControlLogix Redundancy System.
ControlLogix Digital I/O Modules User Manual, publication 1756-UM058 Describes how to install, configure, and troubleshoot ControlLogix digital I/O modules.
ControlLogix Analog I/O Modules User Manual, publication 1756-UM009 Describes how to install, configure, and troubleshoot ControlLogix analog I/O modules.
Using ControlLogix in SIL 2 Applications Safety Reference Manual,
publication 1756-RM001 Describes the guidelines for using ControlLogix controllers in a SIL 2 safety application.
Safety Guidelines for the Application, Installation, and Maintenance of
Solid-state Control, publication SGI-1.1
Designed to harmonize with NEMA Standards Publication No. ICS 1.1-1987 and provides
general guidelines for the application, installation, and maintenance of solid-state control in
the form of individual devices or packaged assemblies incorporating solid-state
components.
Industrial Automation Wiring and Grounding Guidelines, publication 1770-4.1 Provides general guidelines for installing a Rockwell Automation industrial system.
Product Certifications website, rok.auto/certifications. Provides declarations of conformity, certificates, and other certification details.

Rockwell Automation Publication 1715-UM001J-EN-P - December 2020 13
Chapter 1
Redundancy System Overview
The 1715 Redundant I/O System lets a ControlLogix® controller communicate
to a remote, redundant I/O chassis by using EtherNet/IP. The 1715 Redundant
I/O system provides fault tolerance and redundancy for critical processes by
using a redundant adapter pair and multiple I/O modules that have
diagnostics and are easily replaceable.
The modular architecture lets you build and adapt a system to suit the specific
needs of an installation. The architecture lets you choose from different levels
of adapter and I/O fault protection.
The 1715 Redundant I/O System consists of a two-slot adapter base unit that
houses a redundant adapter pair. The adapter base unit is connected to up to
eight I/O base units, which can hold up to 24 I/O modules (three I/O modules
per I/O base unit) when connected together. The I/O modules can be
configured in any combination of simplex or duplex pairs, depending on the
mode of operation needed. The I/O base units can be connected directly to the
adapter base unit and other I/O base units, or through expansion cables.
The 1715 Redundant I/O System is a modular system in which the adapter and
I/O base units snap together by using mating connectors and retaining clips to
form the backplane. One module in a duplex pair can be removed and replaced
without system interruption. The base units, via termination assemblies,
provide the interconnections for power, adapter, and I/O data. Once
connected, the base units form the single mechanical assembly or backplane.
Redundant 1715 Adapters
The redundant, partnered adapters monitor inputs/outputs and diagnostics
for the I/O in the remote chassis. If a fault occurs in one of the redundant
adapters, an IP address switchover occurs and I/O monitoring and
communication to the ControlLogix System continues without interruption.
This switchover is transparent to the user. Status indicators and status
information available to the ControlLogix application enables you to
determine the status of each 1715-AENTR adapter.
1715 I/O Modules
Both digital and analog I/O modules are available for use in this system,
depending on your needs. I/O modules can be used singly or in pairs,
providing configuration in either Simplex or Duplex modes.

14 Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
Chapter 1 Redundancy System Overview
Table 1 lists the 1715 modules that can be used in this system.
.
1715 I/O Modules in SIL 2 Applications
With the inclusion of diagnostics for the CIP messaging channel, the 1715
Redundant I/O system can be used for SIL 2 safety applications. For
information about SIL 2 safety applications, see Chapter 7 and Chapter 8.
System Architecture The 1715 Redundant I/O System operates with a pair of 1715-AENTR adapters.
When designing your control system by using the 1715 Redundant I/O System,
you can use digital and analog I/O modules in one of these ways:
• One I/O module in Simplex mode
• One I/O module with the option to add a second module
• A pair of I/O modules that work in Duplex mode
You must decide the layout of your I/O before building your system, but you
can add more I/O at any time.
The use of termination assemblies communicates the I/O mode of operation
you choose (Simplex or Duplex) to your system through the backplane (the
adapter and I/O base units).
Termination Assemblies
The termination assembly (TA) matches your software configuration for
simplex or duplex. Attached to an I/O base, the TA can start in any slot and can
span multiple connected bases. When modules are used in Duplex mode, one
module can be absent and the system still runs.
Base Unit Structure
The adapter base unit is always the leftmost base unit in the connection chain.
The total length of the base unit connection chain, including all expansion
cables cannot exceed 10 m (32.81 ft).
An adapter always occupies slot 0 or 1.
An adapter base unit can support up to 8 I/O base units (up to 24 I/O modules).
Table 1 - Modules Available for the 1715 Redundant I/O System
Cat. No. Description
1715-AENTR x 2 A pair of Ethernet adapters
1715-IB16D A 16-channel digital input module
1715-OB8DE An 8-channel digital output module
1715-IF16 A 16-channel analog input module
1715-OF8I An 8-channel analog output module

Rockwell Automation Publication 1715-UM001J-EN-P - December 2020 15
Chapter 1 Redundancy System Overview
1715-AENTR Adapters
The leftmost adapter position, or slot, is 0. The rightmost adapter slot is 1. One
redundant adapter pair always occupies slots 0 and 1 of the system. ‘A’
designates the primary adapter partner and ‘B’ designates the secondary
adapter partner of the redundant adapter pair. This system is designed to run
with two adapters. It can run with one adapter for a limited time while
replacing a damaged module, but ideally, needs both adapters running
simultaneously.
I/O Modules
I/O module slots are numbered from 2…25, based on distance from the adapter
base unit. If duplex I/O module pairs are used, the two modules of the pair
must be in adjacent slots. The left, lower slot number is considered the slot
number and address for the pair. Any combination of simplex modules and
duplex pairs can be used in one or more connected I/O base units.
Module Positioning in the 1715 Redundant I/O System
There are 26 total slot positions in the system numbered from 0…25. The first
two positions always contain the redundant adapter pair, in slots 0 and 1. The
remaining positions begin numbering at slot 2 and contain the I/O modules,
ending at slot position number 25. Any combination of simplex or duplex I/O
module pairs can be used in the I/O base units. See Table 2 for a sample of what
a system could look like.
Expansion cables can be used to connect base units, as shown in Figure 1 on
page 17.
IMPORTANT There is no method for configuring a system to use only one 1715-
AENTR adapter. If you use only one 1715-AENTR adapter, the
unused module generates errors.
A ‘partner’ adapter can be installed or removed for replacement,
while the 1715 Redundant I/O System is operational. The ‘partner’
adapter can be identified by the Network Status Light Emitting
Diode (LED) flashing green. During replacement of the module,
there is a one-time, up to a maximum 500 ms, delay to the
system.
IMPORTANT A ‘partner’ I/O module can be installed or removed while the 1715
Redundant I/O System is operational, without impact to the rest
of the system.
The sample system configuration in Example 1 does not match the system
layout that is displayed in Example 2. Example 1 and Example 2 are different
examples of possible configurations you can have for your system.

16 Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
Chapter 1 Redundancy System Overview
Table 2 - Example 1 - A Sample System Configuration
System Slot Number Base Unit Type Module Position/Slot Number by Base
Unit Type Module Designation
0 Adapter 0 Adapter A
1 Adapter 1 Adapter B
2 I/O 01 First I/O base unit Module A of first duplex pair
3 I/O 02 Module B of first duplex pair
4 I/O 03 Module A of second duplex pair
5 I/O 04 Second I/O base unit Module B of second duplex pair
6 I/O 05 First simplex module
7 I/O 06 Module A of third duplex pair
8 I/O 07 Third I/O base unit Module B of third duplex pair
9 I/O 08 Second simplex module
10 I/O 09 Third simplex module
11…25 I/O 10…24 Fourth…eighth I/O base unit Any combination of simplex/duplex pair modules

Rockwell Automation Publication 1715-UM001J-EN-P - December 2020 17
Chapter 1 Redundancy System Overview
Figure 1 - Example 2 - A Sample System Layout
Layout the Hardware This section discusses how to lay out the hardware for the system by topology.
IO BASE
1715-A310
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
Channel 00
Channel 01
Channel 02
Channel 03
Channel 04
Channel 05
Channel 06
Channel 07
Channel 00
Channel 01
Channel 02
Channel 03
Channel 04
Channel 05
Channel 06
Channel 07
Channel 08
Channel 09
Channel 10
Channel 11
Channel 12
Channel 13
Channel 14
Channel 15
Channel 00
Channel 01
Channel 02
Channel 03
Channel 04
Channel 05
Channel 06
Channel 07
Channel 08
Channel 09
Channel 10
Channel 11
Channel 12
Channel 13
Channel 14
Channel 15
IO BASE
1715-A310
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
Channel 00
Channel 01
Channel 02
Channel 03
Channel 04
Channel 05
Channel 06
Channel 07
Channel 00
Channel 01
Channel 02
Channel 03
Channel 04
Channel 05
Channel 06
Channel 07
Channel 08
Channel 09
Channel 10
Channel 11
Channel 12
Channel 13
Channel 14
Channel 15
Channel 00
Channel 01
Channel 02
Channel 03
Channel 04
Channel 05
Channel 06
Channel 07
Channel 08
Channel 09
Channel 10
Channel 11
Channel 12
Channel 13
Channel 14
Channel 15
IO BASE
1715-A310
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
IO BASE
1715-A310
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
Module Status
Redundancy Status
Network Status
Rack Status
Ethernet 1
Ethernet 2
Reset
IO BASE
1715-A310
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
IO BASE
1715-A310
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
IO BASE
1715-A310
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
Channel 01
Channel 02
Channel 03
Channel 04
Channel 05
Channel 06
Channel07
Channel 08
IO BASE
1715-A310
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
Module Status
Redundancy Status
Network Status
Rack Status
Ethernet 1
Ethernet 2
Reset
Healthy
Ready
Run
Healthy
Ready
Run
Healthy
Ready
Run
Healthy
Ready
Run
Healthy
Ready
Run
Healthy
Ready
Run
Healthy
Ready
Run
Healthy
Ready
Run
Healthy
Ready
Run
Healthy
Ready
Run
Healthy
Ready
Run
Healthy
Ready
Run
Healthy
Ready
Run
Healthy
Ready
Run
Healthy
Ready
Run
Healthy
Ready
Run
Healthy
Ready
Run
Healthy
Ready
Run
Healthy
Ready
Run
Healthy
Ready
Run
Healthy
Ready
Run
Healthy
Ready
Run
Healthy
Ready
Run
Healthy
Ready
Run
Channel 00
Channel 01
Channel 02
Channel 03
Channel 04
Channel 05
Channel 06
Channel 07
Channel 00
Channel 01
Channel 02
Channel 03
Channel 04
Channel 05
Channel 06
Channel 07
Channel 08
Channel 09
Channel 10
Channel 11
Channel 12
Channel 13
Channel 14
Channel 15
Channel 00
Channel 01
Channel 02
Channel 03
Channel 04
Channel 05
Channel 06
Channel 07
Channel 08
Channel 09
Channel 10
Channel 11
Channel 12
Channel 13
Channel 14
Channel 15
Channel 00
Channel 01
Channel 02
Channel 03
Channel 04
Channel 05
Channel 06
Channel 07
Channel 08
Channel 09
Channel 10
Channel 11
Channel 12
Channel 13
Channel 14
Channel 15
Channel 00
Channel 01
Channel 02
Channel 03
Channel 04
Channel 05
Channel 06
Channel 07
Channel 00
Channel 01
Channel 02
Channel 03
Channel 04
Channel 05
Channel 06
Channel 07
Channel 08
Channel 09
Channel 10
Channel 11
Channel 12
Channel 13
Channel 14
Channel 15
Channel 00
Channel 01
Channel 02
Channel 03
Channel 04
Channel 05
Channel 06
Channel 07
Channel 08
Channel 09
Channel 10
Channel 11
Channel 12
Channel 13
Channel 14
Channel 15
Channel 00
Channel 01
Channel 02
Channel 03
Channel 04
Channel 05
Channel 06
Channel 07
Channel 08
Channel 09
Channel 10
Channel 11
Channel 12
Channel 13
Channel 14
Channel 15
Channel 00
Channel 01
Channel 02
Channel 03
Channel 04
Channel 05
Channel 06
Channel 07
Channel 00
Channel 01
Channel 02
Channel 03
Channel 04
Channel 05
Channel 06
Channel 07
Channel 08
Channel 09
Channel 10
Channel 11
Channel 12
Channel 13
Channel 14
Channel 15
Channel 00
Channel 01
Channel 02
Channel 03
Channel 04
Channel 05
Channel 06
Channel 07
Channel 08
Channel 09
Channel 10
Channel 11
Channel 12
Channel 13
Channel 14
Channel 15
Channel 00
Channel 01
Channel 02
Channel 03
Channel 04
Channel 05
Channel 06
Channel 07
Channel 08
Channel 09
Channel 10
Channel 11
Channel 12
Channel 13
Channel 14
Channel 15
Channel 00
Channel 01
Channel 02
Channel 03
Channel 04
Channel 05
Channel 06
Channel 07
Channel 00
Channel 01
Channel 02
Channel 03
Channel 04
Channel 05
Channel 06
Channel 07
Channel 08
Channel 09
Channel 10
Channel 11
Channel 12
Channel 13
Channel 14
Channel 15
Channel 00
Channel 01
Channel 02
Channel 03
Channel 04
Channel 05
Channel 06
Channel 07
Channel 08
Channel 09
Channel 10
Channel 11
Channel 12
Channel 13
Channel 14
Channel 15
Channel 00
Channel 01
Channel 02
Channel 03
Channel 04
Channel 05
Channel 06
Channel 07
Channel 08
Channel 09
Channel 10
Channel 11
Channel 12
Channel 13
Channel 14
Channel 15
Channel 00
Channel 01
Channel 02
Channel 03
Channel 04
Channel 05
Channel 06
Channel 07
32066-M

18 Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
Chapter 1 Redundancy System Overview
System Context
The redundant I/O subsystem must be connected to one ControlLogix
redundancy system, or any Logix system that supports I/O via the
EtherNet/IP™ network. The topologies that the 1756-EN2T or 1756-EN2TR
modules support, DLR (Ring) or Star, establish all connections via the Ethernet
network.
For more information about DLR topologies, see the EtherNet/IP Embedded
Switch Technology Application Guide, publication ENET-AP005.
Figure 2 - 1715 Redundant I/O System DLR (Ring) Topology Attached to a 1756 ControlLogix Enhanced
Redundancy System
1756-RM2
1756-EN2TR
IO BASE
1715-A310
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
IO BASE
1715-A310
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
1715-AENTR
1756-EN2TR
1756-RM2
1715-AENTR
1715-I/O
1715-I/O
1715-I/O
1715-I/O
1715-I/O
1715-I/O
1756 ControlLogix
Primary Chassis
1756 ControlLogix
Secondary Chassis
1756 RM Cable
1715 Redundant I/O
System
45242

Rockwell Automation Publication 1715-UM001J-EN-P - December 2020 19
Chapter 1 Redundancy System Overview
Figure 3 - 1715 Redundant I/O System Star Topology Attached to a 1756 ControlLogix Enhanced
Redundancy System
To prevent ground loops caused by shielded cables, RJ45 shields on the
ethernet ports on the 1715 adapter base unit are connected to earth through a
parallel resistance /capacitance circuit arrangement as shown in Figure 4
below:
1756-RM2
1756-EN2T
IO BASE
1715-A310
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
IO BASE
1715-A310
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
CH1
CH1
CH1
CH1
CH1
CH1
CH1
CH1
TERMINAL IDENTITY
AOTA
Dual.
1715-AENTR
1756-EN2T
1756-RM2
1715-AENTR
1715-I/O
1715-I/O
1715-I/O
1715-I/O
1715-I/O
1715-I/O
1756 ControlLogix
Secondary Chassis
1756 ControlLogix
Primary Chassis
1715 Redundant I/O
System
1756 RM Cable
Ethernet
Switch
45239

20 Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
Chapter 1 Redundancy System Overview
Figure 4 - Shield Termination Arrangement to prevent Ground Loops
This complies with the shield grounding guidance given in The CIP Networks
Library, Volume 2, Edition 1.21, section 8-9.4.3. ©ODVA, Inc. 2016.
For more information regarding ODVA, visit www.odva.org.
Simplex Architecture
Simplex I/O modules fail-safe on the first detected module fault. The process
under control shuts down when the fault is detected.
This configuration is suitable for high and low demand module applications.
Resistor
RJ 45
Shield
Transient
Protection
Device
Capacitor