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Allen Bradley 1756-ENBT ControlLogix EtherNet/IP Communication Module
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
| Parameter | Specification |
|---|---|
| Model | 1756-ENBT |
| Brand | Allen Bradley |
| Origin | USA |
| Weight | 0.2 kg |
| Dimensions | 5.7 x 10.5 x 13 cm |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | 5.1 W |
| System Type | PLC / ControlLogix Chassis |
| Network Speed | 10/100 Mbps Ethernet |
| Connection Limit | 128 Logix connections (64 TCP/IP connections) |
| Backplane Current | 1 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.
