Allen-Bradley 1756-EN2TR/C EtherNet/IP Communication Module

Configured for high-speed controller-to-network data exchange in ControlLogix architectures, the Allen-Bradley 1756-EN2TR/C (1756-EN2TR EtherNet/IP Bridge Module) provides direct physical Ethernet packet routing and backplane-level CIP communication within a 1756 ControlLogix chassis. The module executes redundant network connectivity and deterministic I/O data transfer through dual RJ-45 interfaces with integrated Ethernet switch logic.

Suffix Breakdown & Model Matrix

• /C: Hardware revision level C indicating updated internal circuitry and revised Ethernet processing firmware baseline

• Base Model: 1756-EN2TR EtherNet/IP Bridge Module

• Function Class: ControlLogix communication interface module

Hardware Specifications

ControlLogix Backplane & EtherNet/IP Deterministic Networking

The module integrates into ControlLogix backplane architecture and exchanges cyclic I/O and explicit messaging via high-speed backplane bus communication. EtherNet/IP deterministic scheduling supports synchronized packet routing across dual Ethernet channels. The embedded switch architecture enables linear, star, and DLR topologies without external routing hardware. Firmware revision /C maintains compatibility with ControlLogix chassis firmware mapping tables for stable backplane synchronization and CIP connection allocation.

Frequently Asked Questions (FAQ)

Q: Does the 1756-EN2TR/C support hot-swap insertion in a powered chassis?
A: Yes. The module supports hot-swapping in ControlLogix racks with backplane re-enumeration of CIP connections after insertion.

Q: What is the backplane power requirement behavior under full connection load?
A: The module draws approximately 1 A at 5.1 VDC from the chassis backplane under typical full network load conditions.

Q: Can dual Ethernet ports operate independently?
A: Yes. Both ports support simultaneous communication for redundant paths and DLR or linear topology configurations.

Field Installation Guidelines

Install the module only in an energized ControlLogix-compatible 1756 chassis slot. Ensure backplane connectors are fully seated to maintain signal integrity. Use shielded Ethernet cables with proper drain wire grounding at the switch cabinet earth point. Maintain separation between Ethernet and high-voltage conductors to minimize EMI coupling. For redundant architectures, configure switch topology to prevent broadcast loops using managed switches or DLR-enabled devices. Verify firmware compatibility between controller, chassis, and communication module prior to commissioning.