Rockwell Automation Redundant I/O System User Manual
Redundant I/O System
Catalog Numbers 1715-AENTR, 1715-IB16D, 1715-OB8DE,
1715-IF16, 1715-OF8I
User Manual
Original Instructions
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.
WA RN I NG : 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.
Labels may also be on or inside the equipment to provide specific precautions.
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).
2 Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
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
Rockwell Automation Publication 1715-UM001J-EN-P - December 2020 3
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
4 Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
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
Rockwell Automation Publication 1715-UM001J-EN-P - December 2020 5
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
6 Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
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
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
1715 Redundant I/O System in
SIL 2 Safety Applications
Chapter 7
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
Rockwell Automation Publication 1715-UM001J-EN-P - December 2020 7
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
Diagnostic Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241
Diagnostics
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
8 Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
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
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
Rockwell Automation Publication 1715-UM001J-EN-P - December 2020 9
10 Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
Preface
About This Publication
Before You Begin
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 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
Summary of Changes
Rockwell Automation Publication 1715-UM001J-EN-P - December 2020 11
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
at http://www.tuvasi.com
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
This publication contains the following new or updated information. This list
includes substantive updates only and is not intended to reflect all changes.
.
for SIL 2 certification listings.
. See the TÜV website
Top i c Page
PFD Calculations with
Applied latest publication template
24-hour MTTR 274
Additional Resources
These documents contain additional information concerning related products
from Rockwell Automation.
Resource Description
1715 Redundant I/O System Technical Specifications, publication 1715-TD001 Provides technical specifications for components of the 1715 Redundant I/O System.
Describes how you can use EtherNet/IP modules with your Logix 5000™ controller and
EtherNet/IP Network Configuration User Manual, publication ENET-UM001
ControlLogix Enhanced Redundancy System, publication 1756-UM535
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
Using ControlLogix in SIL 2 Applications Safety Reference Manual,
publication 1756-RM001
Safety Guidelines for the Application, Installation, and Maintenance of
Solid-state Control, publication SGI-1.1
Industrial Automation Wiring and Grounding Guidelines, publication 1770-4.1
Product Certifications website, rok.auto/certifications
. Provides declarations of conformity, certificates, and other certification details.
You can view or download publications at rok.auto/literature
communicate with various devices on the Ethernet network.
Provides design and configuration information for a ControlLogix Redundancy System.
Describes how to install, configure, and troubleshoot ControlLogix analog I/O modules.
Describes the guidelines for using ControlLogix controllers in a SIL 2 safety application.
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.
Provides general guidelines for installing a Rockwell Automation industrial system.
.
12 Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
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.
Rockwell Automation Publication 1715-UM001J-EN-P - December 2020 13
Chapter 1 Redundancy System Overview
Table 1 lists the 1715 modules that can be used in this system.
.
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
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).
14 Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
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.
IMPORTANT
There is no method for configuring a system to use only one 1715AENTR 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.
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.
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.
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
a system could look like.
Expansion cables can be used to connect base units, as shown in Figure 1 on
page 17.
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.
Rockwell Automation Publication 1715-UM001J-EN-P - December 2020 15
for a sample of what
Chapter 1 Redundancy System Overview
Table 2 - Example 1 - A Sample System Configuration
System Slot Number Base Unit Type
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
Module Position/Slot Number by Base
Unit Type
Module Designation
16 Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
Figure 1 - Example 2 - A Sample System Layout
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
Chapter 1 Redundancy System Overview
Layout the Hardware This section discusses how to lay out the hardware for the system by topology.
Rockwell Automation Publication 1715-UM001J-EN-P - December 2020 17
Chapter 1 Redundancy System Overview
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
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
.
18 Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
Chapter 1 Redundancy System Overview
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
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:
Rockwell Automation Publication 1715-UM001J-EN-P - December 2020 19
Chapter 1 Redundancy System Overview
Resistor
Figure 4 - Shield Termination Arrangement to prevent Ground Loops
RJ 45
Shield
Transient
Capacitor
Protection
Device
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.
20 Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
Figure 5 - Simplex Architecture - Input and Output
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
1715-AENTR
1715-IB16D
1715-OB8DE
ADAPTER
ADAPTER
O/P
I/P
SENSORS
FINAL
ELEMENTS
1715-
TADOB8DE
1715-
TADIB16D
1715-A2A
1715-A3IO
ControlLogix
CIP NETWORK
Digital Output
Simplex Termination
Assembly
Digital Input
Simplex Termination
Assembly
Adapter
Base Unit
I/O Base Units
45241
Chapter 1 Redundancy System Overview
Duplex Architecture
An example configuration of dual input modules and adapters, and an output
module is shown in Figure 6
provides fault tolerance for module failures. The duplex arrangement can be
used for low demand and high demand applications.
Rockwell Automation Publication 1715-UM001J-EN-P - December 2020 21
. A redundant input or redundant output module
Chapter 1 Redundancy System Overview
ADAPTER
ADAPTER
O/P
I/P
I/P
CLX
CIP NETWORK
Figure 6 - Duplex Architecture Duplex Inputs, Simplex Output
22 Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
Figure 7 - Duplex Architecture Inputs and Outputs
1715-AENTR
1715-AENTR
ADAPTER
ADAPTER
O/P
I/P
SENSORS
FINAL
ELEMENTS
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-IB16D
1715-IF16
I/P
O/P
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-IB16D
1715-IF16
1715-
TADIF16
1715-
TADIB16D
1715-A2A
1715-A3IO
1715-A3IO
CLX
CIP NETWORK
Chapter 1 Redundancy System Overview
Termination assemblies can span across I/O base units.
Mixed Architecture
There can be a mixture of architectures within one system. Figure 8 shows
simplex and dual I/O configurations with dual processors.
Rockwell Automation Publication 1715-UM001J-EN-P - December 2020 23
Chapter 1 Redundancy System Overview
1715-AENTR
1715-AENTR
ADAPTER
ADAPTER
O/P
SENSORS
FINAL
ELEMENTS
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-IB16D
1715-OB8DE
I/P
O/P
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-IB16D
1715-OB8DE
1715-
TADOB8DE
1715-
TADIB16D
1715-A2A
1715-A3IO
1715-A3IO
I/P
I/P
O/P
1715-IB16D
FINAL
ELEMENTS
SENSORS
1715-
TASIB16D
1715-
TASOB8DE
1715-OB8DE
CLX
CIP NETWORK
45423
Figure 8 - Mixed Architecture
Bus Diagram
A detailed drawing of the backplane is shown Figure 9.
24 Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
Figure 9 - Bus Diagram of 1715 Redundant I/O System
Chapter 1 Redundancy System Overview
Switchover Considerations Each 1715 Redundant I/O System uses one IP address as the primary IP address
for all communication on the EtherNet/IP network. The redundant adapter
pair consists of two active modules, a primary adapter and its partner, a
secondary module. For this document, the primary module is referred to as
module ‘A’ and the secondary module is referred to as module ‘B’.
On power-up, the adapter in the leftmost slot is considered the primary
module (when two adapters are present) because it uses the primary IP
address, and because it is the module responsible for receiving/transmitting to
ControlLogix controller on the EtherNet/IP network.
The module in the rightmost slot is considered the secondary module partner
and uses the primary IP address +1. For example, if the primary module in the
leftmost slot has an IP address of ‘N’, then the secondary module in the
rightmost slot, has an IP address of ‘N+1’.
Both modules are always active and are responsible for monitoring all inputs
and outputs, monitoring diagnostics in the system, and reading and writing
data from/to I/O simultaneously. When the primary module receives a write, it
notifies the secondary module of the data to write and which module to write it
to. At a synchronized point in time, both adapters physically write to the I/O.
Rockwell Automation Publication 1715-UM001J-EN-P - December 2020 25
Chapter 1 Redundancy System Overview
The adapters negotiate which module is primary, depending on the status of
the system. If the primary module is unable to perform its role, for example, if
a fault occurs in the primary module, then the secondary module becomes the
new primary, assuming the IP address of the primary module, taking over the
role of communication. The primary module is the only module of the pair that
produces data on the EtherNet/IP network.
If there is a fault, the IP address swapping between the primary module and
the secondary module takes no longer than 20 ms from the time of the
initiating fault. The secondary module is the new primary and handles all
communication. (Depending on the structure of your Ethernet configuration,
this time can be impacted.)
This IP address swap is transparent to the user. You can detect which module
the primary module is by examining the Network status indicator near the top
of each adapter. On the primary adapter, the Network status indicator is solid
green; on the secondary adapter, the Network status indicator flashes green.
Once a swap occurs, the ‘new’ primary module remains the primary unless
there is a good reason to swap over again. If the B module becomes the primary
module because you must replace the A module, that is not enough cause to
swap IP addresses back again. Module B remains as the primary module.
Obtaining a New IP Address
The IP address of the primary module is stored in the adapter base unit
through interaction with the TCP/IP object. If a stored primary IP address is
available, the adapter uses that address. If a stored primary IP address is not
available, then the adapter uses BOOTP/DHCP to obtain an IP address.
The adapter transmits DHCP requests, but is able to process a BOOTP/DHCP
response from either a DHCP or BOOTP server. If the BOOTP/DHCP request is
unsuccessful, the secondary adapter (that is, Module B), attempts to obtain the
IP address of the primary module through BOOTP/DHCP.
The adapters continue to attempt BOOTP/DHCP configuration until an IP
address is obtained, alternating between adapters A and B. Once an adapter
has obtained the IP address, the secondary module can use that IP address + 1.
Once an adapter has a primary IP address, it confirms that it does not have a
duplicate IP address. See EtherNet/IP Network Configuration User Manual,
publication ENET-UM001
IP addresses by showing solid RED.
For additional information about assigning an IP address for the first time, see
Chapter 2, Assign an IP Address
. The Network Status indicator displays duplicated
on page 123.
Ethernet Topology
The 1715 Redundant I/O System supports DLR (Ring) and Star Topologies.
26 Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
Chapter 1 Redundancy System Overview
Module Status
Redundancy Status
Network Status
Rack Status
Ethernet 1
Ethernet 2
Reset
Ethernet 1
Ethernet 2
Reset
Module A
Port 1
Port 2
Module B
Port 1
Port 2
Module Status
Redundancy Status
Network Status
Rack Status
Ethernet 1
Ethernet 2
Reset
Ethernet 1
Ethernet 2
Reset
Module A
Port 1
Port 2
Module B
Port 1
Port 2
Module Status
Redundancy Status
Network Status
Rack Status
Module Status
Redundancy Status
Network Status
Rack Status
45240
For a DLR (Ring) Topology, the Ethernet ports of the adapters are configured
with the outward-facing ports (Port 1 of Module A and Port 2 of Module B)
operating as a 2-port switch. Port 2 of Module A and Port 1 of Module B are
chained together.
Figure 10 - DLR (Ring) Ethernet Topology
For a STAR Topology, the Ethernet ports of the adapters are configured with
the leftmost ports (Port 1 of Module A and Port 1of Module B) operating as a
2-port switch. The rightmost ports on each adapter are left unused.
Figure 11 - STAR Ethernet Topology
Rockwell Automation Publication 1715-UM001J-EN-P - December 2020 27
Chapter 1 Redundancy System Overview
For Ethernet considerations, see EtherNet/IP Network Configuration User
Manual, publication ENET-UM001
Manual, publication 1756-UM535
, and ControlLogix Redundancy User
.
Communication on the EtherNet/IP Network
Communication to a simplex module is addressed to the slot number for that
module. CIP communication to modules in a duplex configuration (including
the adapters) is addressed to the lowest slot number for the module pair.
The adapters respond with CIP errors for attempts to communicate to an I/O
module of a type that is not the same as the physically installed module.
The termination assembly type (simplex/duplex) determines the CIP messages
for corresponding CIP objects that the adapter processes for each I/O module.
System Performance This section discusses connections and RPI settings for the 1715 Redundant I/O
System.
Input / Output Traffic Prioritization
Note:In order to respect its IO schedule, the 1715 privileges class 1 (IO) traffic
over class 3 traffic.
Connections
The adapter has one required connection and does not support a rack
connection.
Each I/O module has one required connection (simplex or duplex).
For example, the system in Figure 12
one is simplex. They are all configured for data connection.
has five I/O modules. Four are duplex and
28 Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
Figure 12 - Duplex and Simplex Connections
The example in Figure 12 shows six connections; one for each entry in the
configuration.
Table 3 - RSLogix 5000® or Studio 5000 Logix Designer® Configuration
Chapter 1 Redundancy System Overview
Connection Module Duplex/Simplex Module Description
1 1715-AENTR Duplex Ethernet Adapter
1 1715-IB16D Duplex 16-point Digital Input
1 1715-OB8DE Duplex 8-point Diagnostic Digital Output
1 1715-IF16 Duplex 16-point Analog Input
1 1715-OF8I Duplex 8-point Analog Digital Input
1 1715-IF16 Simplex 16-point Analog Input
The digital module connections use change-of state-triggers, and the adapter
and analog module connections use cyclic triggers.
RPI
The RPI you set specifies the maximum amount of time between data updates.
The 1715 modules support an RPI range of 60…750 ms.
Cat. No. Minimum RPI Maximum RPI Default RPI
1715-AENTR
1715-IB16D 60 ms
1715-OB8DE 60 ms
1715-IF16 120 ms
1715-OF8I 120 ms
60 ms 750 ms
180 ms
Connection and Data Format
The adapter and I/O modules each support one data connection for input/
output data. Listen Only connections are not supported.
Rockwell Automation Publication 1715-UM001J-EN-P - December 2020 29
Chapter 1 Redundancy System Overview
Timestamping A timestamp is the time an event occurred. It is recorded by the 1715 system
and passed to ControlLogix. Timestamp resolution is in μs, but 1715 is accurate
to 10 ms typical.
30 Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
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