Rockwell Automation 1794-AENTR, 1794-AENTRXT User manual

User Manual Original Instructions
FLEX I/O Dual-port EtherNet/IP
Adapters
Catalog Numbers 1794-AENTR, 1794-AENTRXT

2Rockwell Automation Publication 1794-UM066C-EN-E - April 2023
FLEX I/O Dual-port EtherNet/IP Adapters 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.
These labels may also be on or inside the equipment to provide specific precautions.
The following icon may appear in the text of this document.
Rockwell Automation recognizes that some of the terms that are currently used in our industry and in this publication are not in alignment with the
movement toward inclusive language in technology. We are proactively collaborating with industry peers to find alternatives to such terms and
making changes to our products and content. Please excuse the use of such terms in our content while we implement these changes.
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).
Identifies information that is useful and can help to make a process easier to do or easier to understand.

Rockwell Automation Publication 1794-UM066C-EN-E - April 2023 3
Table of Contents
Preface
About This Publication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Download Firmware, AOP, EDS, and Other Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Studio 5000 Logix Designer Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Summary of Changes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Chapter 1
Overview of FLEX I/O and Your
Redundant EtherNet/IP Adapter
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
The FLEX I/O System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Adapter Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Types of Adapters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Hardware and Software Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
What the Adapter Does . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Use of the Control and Information Protocol (CIP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Understand the Producer/Consumer Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Specify the Requested Packet Interval (RPI). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Rack-optimized and Direct Connection Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Mixing Rack-optimized and Direct Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Chapter 2
Install Your FLEX I/O Adapter Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Module Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Mount Your Adapter on a DIN Rail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Mount on a Panel or Wall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Connect Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Set the Network Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Mounting Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Chapter 3
Configure the Adapter for Your
EtherNet/IP Network
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Configuration Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
IP Address. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Gateway Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Subnet Mask . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Other Methods to Set the IP Address. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Implicit Protected Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Enter and Exit Implicit Protected Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Restrictions Imposed By Implicit Protected Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Perform Tasks When Restricted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Enable or Disable Web Server and SNMP Agent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Chapter 4
Rack-optimized Discrete I/O Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

4Rockwell Automation Publication 1794-UM066C-EN-E - April 2023
Table of Contents
Set Up the Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Before You Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Add the Adapter to the Project . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Add the FLEX I/O Modules to the I/O Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Create the Ladder Program. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Download the Program to the Controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Test the Example Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Chapter 5
Analog I/O with Direct
Connection
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Set Up the Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Create the Example Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Add the Analog Modules to the I/O Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Add the Analog Input Module to the I/O Configuration . . . . . . . . . . . . . . . . . . . . . . . . . 32
Add the Analog Output Module to the I/O Configuration. . . . . . . . . . . . . . . . . . . . . . . . 34
Edit the Controller Tags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Modify the Ladder Program. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Download the Program. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Test the Example Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Appendix A
Interpret Status Indicators Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Status Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Appendix B
Configure the RSLinx Ethernet
Communication Driver
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
About the Ethernet Communication Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Install the RSLinx Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Configure the AB_ETH Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Appendix C
Adapter Web Dialogs Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Enable or Disable the Web Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Log in to the Web Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Mandatory First-time Password Change. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Maximum Limit of Unsuccessful Login Attempts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Access the Home Page of the Web Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Access Diagnostic Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Use the Network Settings Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Use the Ethernet Statistics Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Use the I/O Connections Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Access Configuration Pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Use the Device Identity Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Use the Network Configuration Page. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Use the Device Services Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Rockwell Automation Publication 1794-UM066C-EN-E - April 2023 5
Preface
About This Publication This manual describes how you can use your FLEX™ I/O EtherNet/IP™ adapter with your controller.
The manual helps you install, program, and troubleshoot your module.
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.
Studio 5000 Logix Designer
Application
The Studio 5000 Logix Designer® application is the re-branding of RSLogix 5000® software and
continues to be the product to program Logix 5000® controllers for discrete, process, batch,
motion, safety, and drive based solutions.
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.
Additional Resources These resources link to additional information about related products from Rockwell Automation.
To download publications, click the link or visit rok.auto/literature and search for the publication
numbers.
Topic Page
Updated template Throughout
Added inclusive language acknowledgment 2
Added description for Studio 5000 Logix Designer application 5
Updated Set the Network Address section 14
Added section on Other Methods to Set the IP Address 19
Added section on Implicit Protected Mode 20
Added section on Enable or Disable the Web Server 21, 45
Added section on Log in to the Web Server 46
Addition Resources
Resource Description
FLEX I/O and FLEX I/O-XT Selection Guide, publication 1794-SG002 A description and overview of the 1794 series FLEX I/O and FLEX I/O-XT™ modules and compatible
control platforms.
FLEX I/O Dual Port EtherNet/IP Adapter Module Installation Instructions,
publication 1794-IN131
Information on how to install the FLEX I/O redundant EtherNet/IP adapters
(1794-AENTR, 1794-AENTRXT).
FLEX I/O Communication Adapters Specifications Technical Data,
publication 1794-TD014 Technical specifications and certifications for FLEX I/O communication adapters.
FLEX I/O Power Supply Modules Installation Instructions, publication 1794-IN069 Information on how to install the FLEX I/O DC Power Supply (1794-PS13, 1794-PS3).
Interconnect Cable Installation Instructions, publication 1794-IN012 Information on how to install the extension cables (1794-CE1, 1794-CE3).
EtherNet/IP Network Devices User Manual, publication ENET-UM006 Describes how to configure and use EtherNet/IP devices to communicate on the EtherNet/IP
network.
Ethernet Reference Manual, publication ENET-RM002 Describes basic Ethernet concepts, infrastructure components, and infrastructure features.
Industrial Components Preventive Maintenance, Enclosures, and Contact
Ratings Specifications, publication IC-TD002 Provides a quick reference tool for Allen-Bradley® industrial automation controls and assemblies.
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.

6Rockwell Automation Publication 1794-UM066C-EN-E - April 2023
Preface
Notes:

Rockwell Automation Publication 1794-UM066C-EN-E - April 2023 7
Chapter 1
Overview of FLEX I/O and Your Redundant
EtherNet/IP Adapter
Overview This chapter provides a description of the FLEX I/O dual-port EtherNet/IP adapters and an overview
of how they communicate with programmable controllers.
The FLEX I/O System The FLEX I/O system is a small, modular I/O system for distributed applications that performs all of
the functions of rack-based I/O. Figure 1 shows the components of a FLEX I/O system.
Figure 1 - FLEX I/O System Components
• Adapter – Transfers read and write configuration data to and from the I/O module
• Terminal base – Contains a terminal strip to terminate wiring for two- or three-wire devices
• I/O module – Contains the bus interface and circuitry that is needed to perform specific
functions that are related to your application
The FLEX system consists of an adapter, terminal base unit, DIN rail, power supply, and adapter
cabling components. You can use up to eight terminal bases per adapter.
For detailed instructions on how to set up and install your module, see Install Your FLEX I/O Adapter
on page 11.
Adapter Features The 1794-AENTR and 1794-AENTRXT adapter features include:
• Use of EtherNet/IP messages encapsulated within standard TCP/UDP/IP protocol
• Common application layer with ControlNet® and DeviceNet®
• Interfacing via Category 5 rated twisted-pair cable
• Half/full duplex 10 Mbit or 100 Mbit operation
•DINrailmounting
• Communication to and from other FLEX I/O modules on the same DIN rail
• Communication supported by RSLinx® software
• IP address assigned via standard BOOTP/DHCP tools
• I/O configuration via Studio 5000 Logix Designer application
• No network scheduling required
• No routing tables required
Adapter I/O moduleTerminal base

8Rockwell Automation Publication 1794-UM066C-EN-E - April 2023
Chapter 1 Overview of FLEX I/O and Your Redundant EtherNet/IP Adapter
Types of Adapters The adapter refers to the following catalogs.
Hardware and Software
Compatibility
The adapters and the applications that are described in this manual are compatible with the
following firmware revisions and software releases. Contact Rockwell Automation if you need
software or firmware updates to use this equipment.
See FLEX I/O Communication Adapters Specifications Technical Data, publication 1794-TD014, for
technical specifications and certifications for your adapter.
What the Adapter Does The 1794-AENTR and 1794-AENTRXT adapters perform two primary tasks:
• Control of real-time I/O data (implicit messaging). The adapter serves as a bridge between
I/O modules and the network.
• Support of messaging data for configuration and programming information (explicit
messaging).
Catalog Number Voltage Module Capacity Description
1794-AENTR 24V DC 8 max Dual-port EtherNet/IP adapter
1794-AENTRXT Dual-port EtherNet/IP adapter with extended temperatures range
Table 1 - Hardware and Software Compatibility
Product Firmware Revision/
Software Version
1794-AENTR/1794-AENTRXT adapter 1.xx or higher
Logix 558x Controller 20 or higher
Studio 5000 Logix Designer 20 or higher
RSLinx software 2.59 or higher
5
5
8
0
EtherNet/IP network
E
N
2
T
R
Other
network
devices
A
E
N
T
R
FLEX I/O E
N
2
T
R
ControlLogix I/O
ControlLogix®
5580 chassis

Rockwell Automation Publication 1794-UM066C-EN-E - April 2023 9
Chapter 1 Overview of FLEX I/O and Your Redundant EtherNet/IP Adapter
Use of the Control and
Information Protocol (CIP)
The 1794-AENTR and 1794-AENTRXT adapters use the Control and Information Protocol (CIP™). CIP is
the application layer protocol that is specified for EtherNet/IP, the Ethernet Industrial Protocol, as
well as for ControlNet and DeviceNet. It is a message-based protocol that implements a relative
path to send a message from the producing device in a system to the consuming devices.
The producing device contains the path information that steers the message along the proper
route to reach its consumers. Since the producing device holds this information, other devices
along the path simply pass this information; they do not need to store it.
This has two significant benefits:
• You do not need to configure routing tables in the bridging modules, which greatly simplifies
maintenance and module replacement.
• You maintain full control over the route that is taken by each message, which enables you to
select alternative paths for the same end device.
Understand the Producer/
Consumer Model
The CIP Producer/Consumer networking model replaces the old source/destination (master/slave)
model. The Producer/Consumer model reduces network traffic and increases speed of
transmission. In traditional I/O systems, controllers poll input modules to obtain their input status.
In the CIP system input modules are not polled by a controller. Instead, they produce (multicast)
their data either upon a change of state (COS) or periodically. The frequency of update depends
upon the options that are chosen during configuration and where on the network that the input
module resides. The input module, therefore, is a producer of input data and the controller is a
consumer of the data.
The controller can also produce data for other controllers to consume. The produced and
consumed data is accessible by multiple controllers over the EtherNet/IP network. This data
exchange conforms to the Producer/Consumer model.
Specify the Requested
Packet Interval (RPI)
The RPI is the update rate that is specified for a particular piece of data on the network. The RPI
can be specified for the adapter and include all of the I/O modules communicating through it (using
a rack-optimized connection) or specified for a particular module (using direct connection). When
you add a module or an adapter to the I/O configuration of a controller, you must enter the RPI as a
parameter. This value specifies how often to produce the data for that device. For example, if you
specify an RPI of 50 ms, it means that every 50 ms the device should send its data to the controller
or the controller should send its data to the device.
RPIs are only used for devices that produce data. For example, a ControlLogix EtherNet/IP bridge in
the same chassis as the controller does not require an RPI because it is not a data-producing
member of the system; it is used only as a bridge to remote racks.
Rack-optimized and Direct
Connection Support
The 1794-AENTR and 1794-AENTRXT adapters support both direct and rack-optimized connections.
A direct connection is a real-time data transfer link between the controller and the device that the
configuration data references. Direct connection messaging occurs at a cyclic rate that is specified
by the RPI during configuration. A rack-optimized connection is a grouping of data from multiple
I/O module into a single block of data sent over a single connection at the same data rate.
Rack-optimized connections reduce the total number of connections that are needed to transfer
data when using many I/O modules in a system. The following example illustrates the benefit of
rack-optimized connections.
Assume you have set up a system that contains eight discrete I/O modules interfaced to an
adapter. If you use direct connections to transfer data to each of these I/O modules, you need eight
connections to transfer all of the data, one to each of the eight I/O modules. If you use a rack-
optimized connection to transfer the data, you only need a single connection – the connection to
the adapter.

10 Rockwell Automation Publication 1794-UM066C-EN-E - April 2023
Chapter 1 Overview of FLEX I/O and Your Redundant EtherNet/IP Adapter
See EtherNet/IP Device Level Ring Application Technique, publication ENET-AP007, for more
information on connections.
Mixing Rack-optimized and Direct Connections
You can mix communication formats for different I/O modules communicating through the same
adapter. I/O modules set up to use rack optimization communicates at the rate of the requested
packet interval (RPI) configured for the 1794-AENTR or 1794-AENTRXT adapter. I/O modules that are
configured for direct communication communicate at their own set RPIs and ignore the
adapter RPI.
IMPORTANT Although rack-optimized connections offer an efficient way to use
resources, there are a few limitations on their use:
• You can only use rack-optimized connections to send data to and from
discrete I/O modules. Analog I/O requires direct connections.
• Rack-optimized connections can contain I/O data and status information
only. Additional module information, such as diagnostics, is not available
through a rack-optimized connection.
• All data is sent simultaneously at the RPI rate of the adapter.

Rockwell Automation Publication 1794-UM066C-EN-E - April 2023 11
Chapter 2
Install Your FLEX I/O Adapter
Overview This chapter describes how to physically install the 1794-AENTR or 1794-AENTRXT adapter on the
DIN rail and connect it to the EtherNet/IP network.
Module Components Use Figure 2 to identify the external features of the FLEX I/O EtherNet/IP adapter.
Figure 2 - Dual-port EtherNet/IP Adapter – 1794-AENTR, 1794-AENTRXT
Component Identification
1 Dual-port EtherNet/IP adapter 6 Module locking tab
2 Flexbus connector 7 Network cable RJ45 connectors (underside)
3 24V common connections 8 MAC ID label
4 24V DC connections 9 Status indicators
5 IP address switches
1
9
8
75
6
3
2
4

12 Rockwell Automation Publication 1794-UM066C-EN-E - April 2023
Chapter 2 Install Your FLEX I/O Adapter
Mount Your Adapter on a
DIN Rail
Follow these steps to mount the adapter on a new system before installing any I/O modules.
1. Position the adapter (A) on an IEC standard (35 x 7.5 x 1 mm) top-hat DIN rail (B) at a slight
angle (DIN rail: Allen-Bradley part number 199-DR1; 46277-3; EN50022).
2. Hook the lip on the rear of the adapter onto the top of the DIN rail, and pivot the adapter onto
the rail.
3. Press the adapter down onto the DIN rail until flush. Locking tab (C) snaps the adapter into
position and locks it onto the DIN rail.
4. If the adapter does not lock in place, use a screwdriver or similar device to move the locking
tab down while pressing the adapter flush onto the DIN rail, and release the locking tab to
lock the adapter in place. If necessary, push up on the locking tab to lock.
5. Connect the adapter wiring as shown in Connect Wiring on page 13.
Mount on a Panel or Wall
If mounting this adapter to a panel or wall, see publication 1794-TD013, Panel Mounting Kit, Cat. No.
1794-NM1.
Mount or Replace the Adapter on an Existing System
1. Disconnect any wiring jumpered to the adjacent terminal base.
2. Remove the Ethernet connectors from the bottom of the adapter.
ATTENTION: During mounting of all devices, be sure that all debris (for example,
metal chips, wire strands) is kept from falling into the module. Debris that falls
into the module could cause damage on power-up.
ATTENTION: Do not remove or replace an adapter while power is applied.
Interruption of the backplane can result in unintentional operation or machine
motion.
ATTENTION: If you insert or remove the module while backplane power is on, an
electric arc can occur. This could cause an explosion in hazardous location
installations. Be sure that power is removed or the area is nonhazardous before
proceeding.
WARNING: When used in a Class I, Division 2, hazardous location, this equipment
must be mounted in a suitable enclosure with proper wiring method that complies
with the governing electrical codes.
WARNING: If you connect or disconnect the communication cable with power
that is applied to the adapter or any device on the network, an electric arc
can occur. This could cause an explosion in hazardous location installations.
Be sure that power is removed or the area is nonhazardous before
proceeding.
AB
C

Rockwell Automation Publication 1794-UM066C-EN-E - April 2023 13
Chapter 2 Install Your FLEX I/O Adapter
3. Disconnect any user power wiring connections to the adapter.
4. Open the module latching mechanism and remove the module from the base unit to which
the adapter is attached.
5. Push the Flexbus connector toward the right side of the terminal base to unplug the
backplane connection.
6. Release the locking tab and remove the adapter.
Before installing the new adapter, notice the notch on the right rear of the adapter. This
notch accepts the hook on the terminal base unit. The notch is open at the bottom. The hook
and adjacent connection point keep the terminal base and the adapter tight together,
reducing the possibility of a break in communication over the backplane.
7. Complete the adapter mounting as shown.
Push down and in simultaneously to lock the adapter to the DIN rail.
If the adapter does not lock in place, use a screwdriver or similar device to move the locking
tab down while pressing the adapter flush onto the DIN rail, and release the locking tab to
lock the adapter in place. If necessary, push up on the locking tab to lock.
When the adapter is locked onto the DIN rail, gently push the Flexbus connector into the
adapter to complete the backplane.
8. Reinstall the module in the adjacent terminal base unit.
Connect Wiring
ATTENTION: Verify that the Flexbus connector is completely clear of the
adapter. The slide must be completely to the right and the raised spot on
the slide visible.
A
FE
CD
B

14 Rockwell Automation Publication 1794-UM066C-EN-E - April 2023
Chapter 2 Install Your FLEX I/O Adapter
1. Connect an Ethernet network cable to the RJ45 connector (A).
2. Connect the redundant Ethernet network cable to the RJ45 connector (B).
3. Connect 24V DC common to the left side of the upper connector, terminal F.
4. Connect +24V DC input power to the left side of the lower connector, terminal C.
5. Use connections D and E to pass +24V DC common (E) and 24V DC power (D) to the next
module in the series (if necessary).
Set the Network Address
The adapter ships DHCP-enabled and with the thumbwheel switches set to 999. You can set the
network Internet Protocol (IP) address in these ways:
• Use the pen-push thumbwheel switches on the adapter. Press either the + or the - button
with a pen tip to change the number.
• Use a Dynamic Host Configuration Protocol (DHCP) server, such as Rockwell Automation®
DHCP.
• Retrieve the IP address (if previously set) from nonvolatile memory.
The adapter reads the thumbwheel switches first to determine if the switches are set to a valid
number. You set the node address by using the three-position pen-push thumbwheel switch using
a pen tip.
When the switches are set to a valid number, the adapter IP address is 192.168.1.xxx (where xxx
represents the number set on the switches). The adapter subnet mask is 255.255.255.0. The
adapter gateway address is set differently depending on the firmware revision:
• For Firmware Revision 1.013 and earlier, when the address switches are set to 001...254, the
adapter gateway address is set to 0.0.0.0.
WARNING: If you connect or disconnect wiring while the field-side power is on, an
electric arc can occur. This could cause an explosion in hazardous location
installations. Be sure that power is removed or the area is nonhazardous before
proceeding.
ATTENTION: When connecting wiring, torque terminal screws C, D, E, and F to 0.8
Nm (7 lb-in.).
If multiple power sources are used, do not exceed the specified isolation voltage.
Power wiring must be less than 10 m (32.8 ft.) in length.
Do not wire more than two conductors on any single terminal.
Press a pen tip into the center and perpendicular to the + or the - button to change the
number. You only need a small amount of force to press the button (approximately 2 N).
A B

Rockwell Automation Publication 1794-UM066C-EN-E - April 2023 15
Chapter 2 Install Your FLEX I/O Adapter
• For Firmware Revision 1.014, when the address switches are set to 001, the adapter gateway
address is set to 0.0.0.0. When the address switches are set to 002...254, the adapter
gateway address is set to 192.168.1.1.
The adapter does not have a host name that is assigned, or use any Domain Name System when
using the thumbwheel settings.
If you set the switches to an invalid number (such as 000, or a value greater than 254), the adapter
checks to see if you enabled DHCP.
Mounting Dimensions
The module has the following mounting dimensions.
Press the + or - buttons to
change the numbers
1794-AENTR shown
Millimeters
(Inches)
80.4
(3.16)
87.4
(3.44)
94
(3.70)
1794-AENTR, 1794-AENTRXT
87.4 H x 94 W x 92 D
(344 H x 3.7 W x 3.6 D)
50
(1.96)
30.4
(1.19)

16 Rockwell Automation Publication 1794-UM066C-EN-E - April 2023
Chapter 2 Install Your FLEX I/O Adapter
Notes:

Rockwell Automation Publication 1794-UM066C-EN-E - April 2023 17
Chapter 3
Configure the Adapter for Your EtherNet/IP
Network
Overview This chapter describes how to configure the 1794-AENTR or 1794-AENTRXT adapter for the
ControlLogix 5580 system.
Configuration Requirements Before you can use your 1794-AENTR or 1794-AENTRXT adapter, you must configure its IP address,
and optionally, its subnet mask and gateway address. You can use the Rockwell Automation
BOOTP/DHCP utility to perform the configuration. You can also use generic BOOTP software or,
within some limitations, a DHCP server.
IP Address
The IP address identifies each node on the IP network (or system of connected networks). Each
TCP/IP node on a network (including the 1794-AENTR or 1794-AENTRXT adapter) must have a unique
IP address.
The IP address is 32 bits long and has a Net ID part and a Host ID part. Networks are classified A, B,
C, or other. The class of the network determines how an IP address is formatted.
You can distinguish the class of the IP address from the first integer in its dotted-decimal IP
address as follows:
Each node on the same physical network must have an IP address of the same class and must
have the same Net ID. Each node on the same network must have a different Host ID thus giving it a
unique IP address.
IMPORTANT When using the BOOTP protocol, you must enter the Ethernet hardware
address of your adapter. Rockwell Automation assigns each 1794-AENTR or
1794-AENTRXT adapter a unique 48-bit hardware address at the factory.
The address is printed on a label on the front of your 1794-AENTR or
1794-AENTRXT adapter. It consists of six hexadecimal digits that are
separated by colons. This address is fixed by the hardware and cannot be
changed.
If you change or replace the 1794-AENTR or 1794-AENTRXT adapter, you
must enter the new Ethernet hardware address of the adapter when you
configure the new adapter.
Class A
Class B
Class C
Net ID
Net ID
Net ID Host ID
Host ID
Host ID
0
0
0
0
10
110
89
16 17
24 25
31
31
31
Range of First Integer Class Range of First Integer Class
0…127 A 192…223 C
128…191 B 224…255 other

18 Rockwell Automation Publication 1794-UM066C-EN-E - April 2023
Chapter 3 Configure the Adapter for Your EtherNet/IP Network
IP addresses are written as four decimal integers (0…255) separated by periods where each
integer gives the value of 1 byte of the IP address.
Gateway Address
The Gateway Address is the default address of a network. It provides a single domain name and
point of entry to the site. Gateways connect individual physical networks into a system of networks.
When a node needs to communicate with a node on another network, a gateway transfers the data
between the two networks. The following figure shows gateway G connecting Network 1 with
Network 2.
When host B with IP address 128.2.0.1 communicates with host C, it knows from C’s IP address that
C is on the same network. In an Ethernet environment, B then resolves C’s IP address into a
hardware address (MAC address) and communicates with C directly.
When host B communicates with host A, it knows from A’s IP address that A is on another network
(the net IDs are different). To send data to A, B must have the IP address of the gateway connecting
the two networks. In this example, the gateway’s IP address on Network 2 is 128.2.0.3.
The gateway has two IP addresses (128.1.0.2 and 128.2.0.3). The first must be used by hosts on
Network 1 and the second must be used by hosts on Network 2. To be usable, a host’s gateway
must be addressed using a net ID matching its own.
EXAMPLE For example, the 32-bit IP address:
10000000 00000001 00000000 00000001 is written as 128.1.0.1.
Contact your network administrator or the Network Information Center for a unique
fixed IP address to assign to your module.
Network 1
Network 2
128.2.0.3
128.1.0.2
128.1.0.1
128.2.0.1 128.2.0.2
A
BC
G

Rockwell Automation Publication 1794-UM066C-EN-E - April 2023 19
Chapter 3 Configure the Adapter for Your EtherNet/IP Network
Subnet Mask
The subnet mask is used for splitting IP networks into a series of subgroups, or subnets. The mask
is a binary pattern that is matched up with the IP address to turn part of the Host ID address field
into a field for subnets.
T
2 bits of the Class B host ID have been used to extend the net ID. Each unique combination of bits in
the part of the Host ID where subnet mask bits are 1 specifies a different logical network.
The new configuration is:
A second network with Hosts D and E was added. Gateway G2 connects Network 2.1 with
Network 2.2.
Hosts D and E use Gateway G2 to communicate with hosts not on Network 2.2.
Hosts B and C use Gateway G to communicate with hosts not on Network 2.1.
When B is communicating with D, G (the configured gateway for B) routes the data from B to D
through G2.
Other Methods to Set the
IP Address
The FLEX I/O adapters support the following additional methods to change the IP address:
•BOOTP/DHCPtool
• RSLinx Classic software
For more information on how to use these methods, see EtherNet/IP Network Devices User Manual,
publication ENET-UM006.
EXAMPLE Take Network 2 (a Class B network) in the previous example and add
another network. Selecting the following subnet mask would add two
additional net ID bits, allowing for four logical networks:
11111111 11111111 11 000000 00000001 = 255.255.192.0
These 2 bits of the host ID used to extend the net
ID
Network 1
Network 2.1
Network 2.2
128.1.0.1
128.1.0.2
128.2.128.3
A
BC
G
DE
G2
128.2.64.3
128.2.128.3
128.2.128.3
128.2.128.3

20 Rockwell Automation Publication 1794-UM066C-EN-E - April 2023
Chapter 3 Configure the Adapter for Your EtherNet/IP Network
Implicit Protected Mode Implicit Protected Mode is a state where the device is operational, but has implemented defenses
against disruptive changes that would take the product out of service for the process. For
complete information on how Protected Mode works, see EtherNet/IP Network Devices User Manual,
publication ENET-UM006.
Implicit Protected Mode is a security enhancement that is automatically triggered as soon as one of
the following occur:
• The adapter bridges I/O connections.
• The adapter is a target of I/O connections.
This security enhancement occurs on the I/O module level and helps prevent unauthorized
configuration changes that can affect system behavior and cause unintended and unforeseen
changes.
Enter and Exit Implicit Protected Mode
The adapter enters Implicit Protected Mode as soon as I/O connections are established through or
to the adapter (status connection). The adapter exits Implicit Protected Mode as soon as all I/O
connections through or to the adapter (status connection) are stopped.
Restrictions Imposed By Implicit Protected Mode
Implicit Protected Mode helps prevent access to services that are not required after the device is
configured and in normal operation. Protected Mode disables features that can make the device
vulnerable to disruptive actions. By doing so, Protected Mode helps to reduce the attack surface.
When it is in Protected Mode, the adapter helps prevent execution of the following tasks:
• Changing Ethernet configuration settings, such as port speed
• Changing IP settings, such as IP address, mask, and DHCP mode
• Updating the adapter firmware revision
• Disabling or re-enabling external product ports
• Performing remote adapter resets
Perform Tasks When Restricted
If the adapter is in Implicit Protected Mode and you attempt to perform any of the restricted tasks,
you are alerted that such a task cannot be performed because the adapter is in Implicit Protected
Mode.
The following are example alerts that result from an attempt to set IP values on the adapter when
the adapter is in Implicit Protected Mode:
ATTENTION: The 1794-AENTR or 1794-AENTRXT adapter must be assigned a fixed
network address. The IP address of this adapter must not be dynamically
provided.
Failure to observe this precaution may result in unintended machine motion or
loss of process control.
IMPORTANT Protected Mode is not configurable.