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SKU: 1756-ENBT

Allen Bradley 1756-ENBT ControlLogix EtherNet/IP Communication Module

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Configured for high-speed industrial data routing and CIP message exchange in ControlLogix backplane architectures, the Allen Bradley 1756-ENBT (1756-ENBT EtherNet/IP Bridge Module) provides direct physical/electrical execution.

Hardware Specifications

ParameterSpecification
Model1756-ENBT
BrandAllen Bradley
OriginUSA
Weight0.2 kg
Dimensions5.7 x 10.5 x 13 cm
Operating Temp0 to 60 deg C
Power Consumption5.1 W
System TypePLC / ControlLogix Chassis
Network Speed10/100 Mbps Ethernet
Connection Limit128 Logix connections (64 TCP/IP connections)
Backplane Current1 A at 5.1 VDC / 3 mA at 24 VDC
Tariff Code (HS Code)8537101190

Deterministic EtherNet/IP Integration

The module manages deterministic industrial Ethernet routing over standard CIP protocols across the 1756 backplane bus. Designed for high I/O density scaling, it offloads Ethernet protocol handling from the main Logix controller without imposing backplane processing delays. The internal MAC firmware layer handles packet prioritization to preserve real-time messaging performance, maintaining strict temporal boundary execution for connected I/O drops and peer-to-peer controller communications.

Frequently Asked Questions

Q: How many active connections does the 1756-ENBT support concurrently across the backplane?

A: The module supports up to 128 CIP connections (comprising up to 64 TCP/IP connection instances) simultaneously without degrading local backplane message arbitration.

Q: Is RIUP (Removal and Insertion Under Power) permitted for this module during active system operation?

A: Yes, the module supports RIUP within a energized ControlLogix chassis, provided the field wiring and backplane connectors remain free of transient short circuits during slot insertion.

Field Installation Guidelines

  • Verify that the chassis slot keying aligns correctly before seating the module onto the backplane connector.
  • Maintain STP (Shielded Twisted Pair) Cat 5e or Cat 6 Ethernet cabling with shield termination grounded at the panel entry point to prevent ground loops.
  • Route communication cables in separate conduits away from high-voltage AC motor drives and heavy inductive loads to prevent electromagnetic interference.
  • Ensure adequate vertical clearance above and below the 1756 chassis to preserve passive convection cooling across the internal heat dissipation vents.
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ParameterSpecification
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BrandAllen-Bradley
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Weight1.45 kg
Dimensions14.2 cm x 17.5 cm x 13.2 cm
Operating Temp0 to 60 deg C
Power Consumption24 VDC Nominal Input
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Range of ProductControlLogix
SystemPLC
HS Code8537101190

EtherNet/IP and Backplane Communications Integration

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Frequently Asked Questions

Q: Can the power supply module be replaced while the connected chassis is actively processing control loops?A: Yes, the unit supports live hot-swapping. The secondary power supply in the redundant configuration maintains system backplane current during module removal without causing processor resets or I/O interruptions.Q: What input power connection type is required for operation?A: The module accepts a direct nominal 24 VDC input connection to feed internal regulation circuitry and drive chassis backplane power distribution.

Field Installation Guidelines

  • Cabinet Mounting and Clearance: Secure the chassis power supply assembly vertically using standard DIN-rail or panel-mounting hardware within an industrial enclosure. Ensure a minimum of 50 mm clearance above and below the module for natural thermal convection.
  • Grounding Protocols: Connect a heavy-gauge copper grounding wire from the module ground terminal directly to the enclosure main earth bus bar to mitigate electrical noise and transient surge risks.
  • Wiring and Isolation Limits: Route input 24 VDC conductors separately from high-voltage AC lines and high-frequency communication cables to prevent inductive noise coupling.
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ParameterSpecification
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Dimensions6 x 12.3 x 13 cm
Operating Temp-25 deg C to 70 deg C
Power Consumption240 W output rating

Profinet and EtherNet/IP Deterministic Networks

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Field Installation Guidelines

Mount the unit securely onto a standard DIN-rail inside the control cabinet, ensuring sufficient clearance for convection cooling airflow. Connect incoming AC mains and protective earth conductors to the designated terminals in accordance with local electrical safety codes. Verify output voltage at the screw terminals using a calibrated multimeter before connecting downstream PLC loads.
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ParameterSpecification
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BrandAllen Bradley
OriginUSA
Weight0.35 kg
Dimensions23.3 x 18.2 x 5.3 cm
Operating Temp0 deg C to 60 deg C
Power Consumption1 W (backplane current draw at 5.1 VDC: 150 mA)

Profinet / EtherNet/IP Deterministic Networks

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Frequently Asked Questions

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Field Installation Guidelines

Mount the module into any available slot within a standard ControlLogix chassis using the chassis guide rails, ensuring the latching mechanism engages securely. Connect shielded twisted-pair cables to the removable terminal block (RTB) to mitigate electromagnetic interference. Terminate cable shields to the nearest functional earth ground bar using grounding lugs. Verify backplane power status prior to seating the module to prevent electrical transients.
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Hardware Specifications

ParameterSpecification
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BrandAllen Bradley
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Weight0.35 kg
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Industrial Control and Network Characteristics

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ParameterSpecification
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