Allen-Bradley 1756-EN2TRK EtherNet/IP Communication Module

The Allen-Bradley 1756-EN2TRK, also cataloged as the 1756-EN2TRK Ethernet Communication Module, operates as a dedicated hardware component for deterministic EtherNet/IP data routing and ControlLogix backplane integration within ControlLogix chassis networks. The module executes cyclic CIP messaging and TCP/IP communication through dual copper Ethernet interfaces while maintaining chassis-level backplane data synchronization across any slot configuration.

Suffix Breakdown & Model Matrix

No manufacturer-defined suffix decomposition provided for 1756-EN2TRK.
Base functional designation remains the standard ControlLogix EtherNet/IP communication module identifier.

Hardware Specifications

ControlLogix Backplane Communication & EtherNet/IP Determinism

The module integrates into ControlLogix architecture via high-speed backplane bus communication velocity scheduling, enabling synchronized CIP packet handling between controller and network interface layers. EtherNet/IP deterministic networks are supported through dual-port topology handling, allowing linear and star configurations without external switching constraints. Firmware-level mapping maintains connection consistency across chassis slot assignments, while I/O density scaling is managed through CIP connection allocation tables.

Frequently Asked Questions (FAQ)

Q: Does the 1756-EN2TRK support hot insertion in an active ControlLogix chassis?
A: Yes. The module supports hot-swap insertion with automatic backplane re-enumeration and connection re-establishment.

Q: What is the impact of full TCP/IP connection utilization on backplane load?
A: At maximum connection load, the module maintains approximately 1 A draw on the 5 VDC backplane with stable CIP scheduling.

Q: Are both Ethernet ports functionally independent?
A: Yes. Dual ports support parallel communication paths and linear or star topology segmentation.

Field Installation Guidelines

Install the module into any available ControlLogix chassis slot with full backplane connector engagement. Ensure correct seating alignment to maintain signal integrity across the chassis bus. Use shielded Ethernet cabling with proper grounding of the shield drain at the cabinet earth point. Maintain separation between communication wiring and power conductors to reduce EMI coupling. Verify firmware compatibility between controller, chassis, and communication module prior to system initialization.