Configured for high-speed Ethernet/IP data exchange in distributed control systems, the Allen-Bradley 1794-AENT (1794-AENT Flex I/O communication adapter) provides direct physical/electrical execution.

Device Summary Matrix

• Base Model: 1794-AENT

• Function: Ethernet/IP Communication Adapter

• Network Interface: 10/100 Mbps RJ45

• I/O Capacity: Up to 8 modules

• Power Requirement: 24 VDC Nominal

Hardware Specifications

Deterministic Network Integration

The 1794-AENT adapter utilizes EtherNet/IP deterministic networks to facilitate real-time data transfer between field I/O and controller platforms. It supports high-speed backplane bus communication, ensuring that I/O density scaling remains predictable across distributed nodes. The hardware supports firmware flash compatibility, allowing for updates that maintain alignment with evolving network protocols and communication logic within the EtherNet/IP architecture.

Ordering Info

• 1 unit 1794-AENT Communication Adapter

• 1 technical documentation sheet

Field Installation Guidelines

• Mounting: Snap the adapter onto a standard 35 mm DIN rail. Ensure the mechanical locking mechanism is fully engaged for vibration resistance.

• Grounding: Terminate the chassis ground connection to a common potential earth rail to minimize electromagnetic interference.

• Cabling: Utilize shielded Category 5 Ethernet cabling. Ensure the RJ45 interface is free of debris and physical stress that could cause connection latency.

• Power: Connect to a regulated 24 VDC power source. Ensure the voltage remains within the 19.2-31.2 VDC operational window to avoid intermittent resets.

Frequently Asked Questions

• Does the 1794-AENT support hot-swapping of I/O modules?

  Yes, the adapter supports the hot-swapping of Flex I/O modules while the adapter is powered, provided the backplane power is managed correctly.

• What is the maximum number of modules supported?

  The 1794-AENT adapter supports a maximum of 8 Flex I/O modules on a single rack.

• Is the Ethernet port auto-negotiating?

  Yes, the RJ45 port supports auto-negotiation for 10/100 Mbps communication speeds.

• What happens if the input voltage drops below 19.2 VDC?

  The module may experience power cycles or loss of communication with the controller if the input voltage falls below the specified threshold.

• Can this adapter be used in a redundant network configuration?

  The 1794-AENT is designed for standard EtherNet/IP topologies. For redundant networks, specialized hardware or managed switch configurations are required.

• How is the module address assigned?

  Network addressing is typically configured via the Logix 5000 software or via a hardware rotary switch interface depending on the specific revision.

• Does the module require an external fuse?

  While the adapter has internal protection, adhering to local electrical codes regarding auxiliary fusing for the 24 VDC supply is recommended.

• Is the adapter isolated from the backplane?

  The adapter provides basic insulation with a 50 V continuous isolation voltage rating between the field bus and internal circuitry.