Allen-Bradley 1794-AENT Flex I/O Ethernet/IP Adapter Module
Product Overview
The Allen-Bradley 1794-AENT is a communication adapter module from Rockwell Automation's Flex I/O series, designed to enable distributed I/O architecture in industrial automation systems. This module serves as a crucial interface between EtherNet/IP-enabled controllers (such as CompactLogix and ControlLogix) and Flex I/O modules, facilitating seamless data exchange and control in various industrial environments. Its compact design, flexibility, and robust performance make it suitable for applications across multiple industries, including manufacturing, process control, automotive, and material handling
.
As part of Rockwell Automation's integrated architecture, the 1794-AENT provides a cost-effective solution for implementing distributed I/O systems. It supports real-time data communication, simplifies wiring, and reduces installation costs by allowing I/O points to be placed close to field devices. The module is designed to operate reliably in harsh industrial conditions, ensuring consistent performance in temperatures ranging from 0 to 55°C (32 to 131°F) and relative humidity levels of 5% to 95% (non-condensing)
.
Key Features and Capabilities
Communication and Networking
The 1794-AENT features a single RJ-45 port supporting EtherNet/IP protocol at communication speeds of 10/100 Mbps
. It enables Flex I/O racks to connect to Ethernet networks, allowing supported controllers to exchange data with Flex I/O modules. This adapter supports
linear network topology and can be configured via
DIP switches or
DHCP server. The module's integration into EtherNet/IP networks facilitates
device configuration,
data collection, and
process control on a single high-speed network
.
I/O Capacity and Expansion
The adapter supports up to eight Flex I/O modules in a single rack, providing flexibility for various application needs
. These can include
discrete input/output modules and
analog input/output modules, allowing users to tailor the system to specific requirements
. This expandability makes the 1794-AENT suitable for small to medium-sized applications where distributed I/O is advantageous.
Power Requirements
The module operates on a 24V DC power supply with an input voltage range of 19.2 to 31.2V DC (including 5% AC ripple)
. At 24V DC, the module has a current load of
450 mA, with a
maximum Flexbus output current of 640 mA at 24V DC. Its
maximum power consumption is 7.3W at 19.2V DC, with a
thermal dissipation of 24.9 BTU/hour at 19.2V DC
.
Status Indicators
The 1794-AENT is equipped with LED status indicators to monitor module operation:
-
Module Status (Red/Green): Indicates the overall condition of the module.
-
Network Status (Red/Green): Shows the network connection status.
-
Link Status (Green): Displays the Ethernet link activity
Design and Construction
The module features an open-style enclosure with protection rated at IP20, requiring installation in a suitable cabinet for protection against liquids and dust
. It is designed for
DIN rail mounting or
wall mounting, with dimensions of approximately
87 x 94 x 92 mm (3.4 x 3.7 x 3.6 inches) and a weight of
227 grams (8.01 ounces). For proper grounding, it is recommended to use
galvanized yellow chromate steel DIN rail brackets to avoid improper intermittent grounding caused by corrosion or oxidation
.
Technical Specifications
The following table summarizes the key technical specifications of the Allen-Bradley 1794-AENT adapter module:
System Configuration and Programming
Hardware Configuration
The 1794-AENT module is typically mounted on a DIN rail using appropriate hardware
. It connects to Flex I/O modules through the backplane, eliminating the need for individual wiring between the adapter and each I/O module. The recommended wire size for power connections ranges from
0.33 to 3.31 mm² (22 to 12 AWG) stranded copper wire with insulation rated for
75°C (167°F) or higher. The maximum insulation thickness should not exceed
1.2 mm (3/64 inch), and the terminal screw torque should be
0.8 N·m (7 lb·in)
.
Software and Programming
The module is configured using Rockwell Automation's RSLogix 5000 software
. The configuration process involves setting the
IP address,
subnet mask, and
gateway address as needed. The module does not require
network scheduling or
routing tables, simplifying the setup process. The 1794-AENT uses the
Control and Information Protocol (CIP) for communication over EtherNet/IP
.
Applications
The 1794-AENT is widely used in various industrial automation applications, including:
-
.
-
Machine Automation: Providing reliable data transmission and control for CNC machine tools, automated packaging machinery, and other equipment requiring precise operation
-
.
-
Process Control: Enabling data exchange between controllers and I/O modules in process industries such as chemical, pharmaceutical, and food processing.
-
Material Handling and Logistics: Integrating automated storage and retrieval systems, conveyors, and sortation equipment in distribution centers
The module is particularly beneficial in applications requiring Internet/Intranet connectivity, built-in switching, high availability requirements, plant management (material handling), time-critical applications without established schedules, configuration, data collection, control on a high-speed single network, and regular data transmission
.
Comparison and Considerations
The 1794-AENT is part of the Flex I/O adapter family, which includes variants such as the 1794-AENTR (with two Ethernet ports for redundancy) and 1794-AENTRXT (designed for extreme temperatures)
. When selecting an adapter, consider factors such as:
-
Network Requirements: The single Ethernet port of the 1794-AENT is sufficient for most applications, but redundant systems may require the dual-port AENTR variant.
-
Environmental Conditions: The standard operating temperature range (0-55°C) is adequate for most industrial environments; harsh conditions may require the XT version.
-
I/O Needs: The ability to support up to eight modules provides flexibility for expanding systems as needed.
-
Compatibility: The module works with various controllers, including CompactLogix, ControlLogix, PLC5, and SLC500 platforms
Conclusion
The Allen-Bradley 1794-AENT Flex I/O EtherNet/IP Adapter Module is a versatile and reliable solution for implementing distributed I/O systems in industrial automation environments. Its ease of integration, support for multiple I/O modules, and seamless communication with EtherNet/IP-enabled controllers make it a valuable component in modern manufacturing and process control systems.
As part of Rockwell Automation's integrated architecture, the 1794-AENT helps reduce installation costs, simplify system design, and improve overall operational efficiency. Whether used in discrete manufacturing, process industries, or logistics automation, this adapter module delivers the performance, flexibility, and reliability needed to meet the demands of today's industrial automation applications. Its robust design ensures consistent operation in challenging industrial environments, making it a trusted choice for engineers and system integrators worldwide.
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