Configured for high-speed industrial network interface and packet routing in ControlLogix platforms, the Allen-Bradley 1756-EN4TR (1756-EN4TR EtherNet/IP Module) provides direct physical/electrical execution.

Catalog Designation Architecture

• 1756: ControlLogix standard chassis backplane interface series.

• EN4: High-performance gigabit EtherNet/IP communication architecture.

• T: Dual copper RJ45 physical layer interface ports.

• R: Integrated Device Level Ring (DLR) fault-tolerant network topology support.

Technical Performance Parameters

Proximity Deterministic Networks and Flash Integrity

The module executes EtherNet/IP deterministic networks protocols across dual RJ45 ports to manage high-throughput I/O message routing. Optimized backplane bus communication velocity allows rapid data interchange with central processing units. Internal non-volatile memory features firmware flash compatibility for direct system image updates and persistent operating configuration retention during panel power outages.

Standard Package Items

• 1 x Allen-Bradley 1756-EN4TR EtherNet/IP Module

• 1 x Installation Instruction Sheet

Cabinet Mounting Guidelines

• Chassis Insertion

  Align card edge connectors with chassis guide rails and slide the module into the selected 1756 slot until upper and lower latches lock.

• Grounding Path Verification

  Confirm the 1756 chassis backplane frame is bonded to central protective earth (PE) using heavy copper grounding wire.

• Cable Strain Relief

  Route Cat 5e or Cat 6 STP ethernet cables with adequate bend radius to eliminate stress on RJ45 port connectors.

• Port Termination

  Insert RJ45 connectors with shielded metal housings into the dual network ports until mechanical retention clicks.

• Thermal Spacing

  Ensure unobstructed air circulation around cabinet wire ducts to maintain operating temperatures within 0 to 60 deg C.

Hardware Technical Details

• What is the maximum backplane current draw for the 1756-EN4TR module?

  The module draws up to 1.2 A at 5.1 VDC and 3 mA at 24 VDC directly from the 1756 ControlLogix backplane power supply bus.

• Is Removal and Insertion Under Power (RIUP) supported for this communication module?

  Yes, the module supports RIUP execution, allowing hot-swap installation or removal while the ControlLogix backplane remains energized.

• What physical network connection speeds does the module interface support?

  The dual RJ45 copper ports support auto-negotiation Ethernet communication speeds of 10 Mbps, 100 Mbps, and 1 Gbps full-duplex.

• How many total CIP connections can the module handle concurrently?

  The 1756-EN4TR handles up to 512 CIP connections and up to 256 TCP/IP connections for network bridging and messaging routines.

• What fault-tolerant ring topology is natively integrated into the dual-port hardware?

  The module features built-in Device Level Ring (DLR) technology, allowing ring restoration in less than 3 ms upon single-point cable failure.

• What heat dissipation level must be accounted for during cabinet thermal planning?

  The unit operates with a maximum power dissipation rating of 6.0 W under full network traffic loading conditions.

• How is network IP configuration set on the physical module hardware?

  IP addressing can be configured via BOOTP/DHCP utility, Studio 5000 software tools, or onboard rotary switches depending on hardware revision.

• What software application manages firmware flashing and module configuration?

  Module parameters and firmware updates are loaded using Studio 5000 Logix Designer or ControlFLASH application software.