Allen-Bradley 1794-AENT Ethernet IP Adapter Module

1794-AENT Allen-Bradley Flex I/O Ethernet/IP Adapter Module

Product Introduction

The 1794-AENT module from Allen-Bradley is a dedicated Ethernet/IP adapter that serves as the gateway for the distributed Flex I/O system. This adapter enables seamless communication between a central Ethernet-enabled controller and up to eight discrete, analog, or specialty I/O modules. It integrates the Flex I/O rack directly into an Ethernet network for efficient data exchange. Additionally, its compact design and flexible mounting options make it suitable for various industrial applications.

Specifically, this adapter processes input data from field devices and delivers output commands from the controller with minimal latency. It uses the proven Ethernet/IP protocol to ensure reliable performance. The single RJ45 port on the 1794-AENT supports 10/100 Mbps communication rates and linear topology. Furthermore, users can configure the network address using the built-in thumbwheel switches or a DHCP server. This module operates from an external 24V DC supply.

Key Technical Specifications

This communication adapter includes several critical parameters for proper system design. For instance, it offers a Communication Rate of 10/100 Mbps over its single RJ45 port. The module's Input Voltage Range is between 19.2 to 31.2 Volts DC, with a nominal rating of 24 Volts DC. Additionally, it handles a maximum current draw of 550 mA. The Flexbus Output Current, which powers the connected I/O modules, can reach a maximum of 640 mA at 5 Volts DC.

The 1794-AENT also provides visual diagnostics through its built-in LED indicators. Specifically, it features a Mod Status LED, a Network Status LED, and a Link Status LED. Furthermore, the electrical isolation is robust, with an Isolation Voltage of 50 Volts Continuous. The power consumption is 550 mA max, with 440 mA max at 24V DC. By default, the adapter switches are set at 999 for network addressing.

Mechanical and Environmental Ratings

Environmental Limits

The 1794-AENT is built to withstand demanding industrial conditions. Its Operating Temperature ranges from 0 to 55 °C (32 to 131 °F), with a Storage Temperature range of -40 to 85 °C (-40 to 185 °F). Furthermore, it operates reliably in 5 to 95% non-condensing relative humidity.

Mechanical Stress Tolerance

This adapter is exceptionally durable against physical stress. It meets the IEC 68-2-6 standard for Vibration, rated at 5 g @ 10-500 Hz. For shock, it withstands an Operating Shock of 30 g peak acceleration with an 11 ms pulse width. It also endures a non-operating shock of 50 g. Consequently, the 1794-AENT remains stable in applications with significant vibration.

Power and Thermal Management

Efficient power management is crucial for the 1794-AENT. Its Power Dissipation is rated at 7.3 W max at 19.2V DC. Correspondingly, its Thermal Dissipation is 24.9 BTU/hr at 19.2V DC. Therefore, this module generates moderate heat that must be accounted for in the panel design. Users should ensure adequate airflow around the module to maintain the surrounding temperature within the specified limit.

Installation Guidelines

Mounting Options

Primarily, the 1794-AENT is designed for DIN Rail mounting. However, it also supports wall mounting for flexible installation. Its compact dimensions, measuring 87 x 94 x 92 mm, help it fit neatly in crowded cabinets. Remember that the adapter has an open-type enclosure. Hence, it requires an appropriate IP-rated cabinet for protection against dust and direct contact.

Ethernet and Flexbus Connections

For network connections, the adapter uses a single RJ45 port with Cat.5 Ethernet cable. Users must connect this to an Ethernet/IP network. Furthermore, the module connects to the Flex I/O system via the terminal base units. It supports a maximum of eight terminal bases and thus a maximum of eight I/O modules. For power connections, use 0.34 to 2.5 mm² (22 to 12 AWG) stranded copper wire with an insulation rating of 75 °C or higher.

Addressing and Configuration

The 1794-AENT includes built-in thumbwheel switches for network address configuration. By default, the switches are set at 999. Users can also configure the address using a DHCP server. This feature simplifies installation and reduces setup time.

Packaging and Shipping Information

All units of the 1794-AENT are carefully packaged to prevent static or physical damage. The package includes the adapter module itself. However, the packaging does not include installation manuals, mounting hardware, or terminal base units. We professionally pack the module in anti-static material and secure it for shipping. The shipping weight is approximately 0.23 kg (8.01 oz).

• Shipping Carriers: FedEx, UPS, DHL

• Warranty and Certificates: Not included in the package

Frequently Asked Questions (FAQ)

1. How many Flex I/O modules does the 1794-AENT support?
It supports up to eight Flex I/O modules of any combination, including discrete, analog, and specialty modules.

2. What communication speed does the 1794-AENT offer?
This adapter supports 10/100 Mbps communication rates over its single RJ45 Ethernet port.

3. How do I set the network address on the 1794-AENT?
Use the built-in thumbwheel switches on the module or configure it using a DHCP server. By default, the switches are set at 999.

4. What cable is recommended for the 1794-AENT?
Use a standard RJ45 Cat.5 Ethernet cable for network connections.

5. Can the 1794-AENT be mounted on a panel?
Yes, it supports both DIN rail mounting and wall mounting for flexible installation options.