Allen-Bradley 1794-AENTR FLEX I/O Dual Port EtherNet/IP Adapter Module

Configured for high-speed deterministic networking in ControlLogix and CompactLogix platforms, the Allen-Bradley 1794-AENTR (1794-AENTR Communication Adapter) provides direct physical/electrical execution of EtherNet/IP data encapsulation and I/O backplane management.

Hardware Specifications

Profinet / EtherNet/IP Deterministic Networks and Firmware Compatibility

The 1794-AENTR utilizes a dual-port architecture to support Device Level Ring (DLR) topologies, ensuring fault-tolerant communication within EtherNet/IP deterministic networks. Firmware flash compatibility is managed through the Rockwell Automation Logix platform, requiring matched EDS files to ensure proper I/O data mapping and module configuration. The adapter manages I/O density scaling by supporting up to 8 FLEX I/O modules, with internal diagnostics provided by status indicators for Module, Network, and Link states. Galvanic isolation (tested at 1000 VAC) is integrated between the power input, the internal FlexBus, and the Ethernet physical layer to prevent ground loops and surge-induced hardware failure.

Frequently Asked Questions

Q: Does the module support hot-swapping of I/O modules?

A: Yes, the 1794-AENTR supports the removal and insertion of FLEX I/O modules under power. However, ensure that the removal does not interrupt the electrical continuity of the FlexBus if not properly managed by the controller software.

Q: What power supply standards must be met for CE compliance?

A: To comply with the CE Low Voltage Directive, the module must be powered from a source compliant with Safety Extra Low Voltage (SELV) or Protected Extra Low Voltage (PELV) standards, operating within a nominal 24 VDC range.

Field Installation Guidelines

• Mounting Stability: Ensure the adapter is securely mounted on a standard 35 mm DIN-rail. Verify that the locking mechanism is engaged to prevent vibration-induced dislodgement.
• Grounding Requirements: Maintain a low-impedance ground connection to the chassis to dissipate surge voltages. Ensure that power cabling adheres to the 19.2 to 31.2 VDC input range, accounting for the 5% AC ripple tolerance.
• Cable Routing: Separate Ethernet cabling from high-voltage AC or inductive load lines to minimize electromagnetic interference (EMI). Maintain the required bend radius for Ethernet cabling to prevent signal attenuation.
• Power-up Sequence: Upon applying 24 VDC power, observe the LED status indicators. A steady green on Module and Network status indicates a successful power-on self-test and established network connection.
• Module Seating: When adding FLEX I/O modules, ensure the FlexBus connectors are aligned and the plastic locking tabs are fully snapped into place to ensure consistent electrical contact.