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Description
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 1756-ENBT |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Type | EtherNet/IP Bridge Communication Module |
| Series / Platform | 1756 ControlLogix |
| Ethernet Ports | 1 × RJ45 Category 5 (10/100 Mbps auto-negotiating) |
| Network Standard | IEEE 802.3 compliant, shielded or unshielded twisted pair |
| TCP Connections | 64 maximum |
| CIP Connections | 128 maximum (any combination of explicit and implicit) |
| CIP Unconnected Messages | 64 + 64 (backplane + Ethernet) |
| I/O Packet Rate | Up to 5000 packets per second |
| Current Draw | 700 mA @ 5.1V DC; 3 mA @ 24V DC |
| Power Dissipation | 3.7 W (12.6 BTU/hr) |
| Isolation Voltage | 30V continuous (Ethernet network to backplane); type-tested at 707V DC @ 60 s |
| Enclosure Type Rating | None (open-style) — ControlLogix chassis mounted |
| Slot Width | 1 ControlLogix slot |
| Display | Module status LEDs (digital) |
| Wiring Category | Category 2 on Ethernet ports |
| Dimensions | 140 × 40 × 118 mm (5.51 × 1.57 × 4.65 in) |
| Weight | 0.32 kg (0.71 lbs) |
| Operating Temperature | 0 °C to 60 °C (32 °F to 140 °F) |
| Storage Temperature | –40 °C to 85 °C (–40 °F to 185 °F) |
| Relative Humidity | 5% to 95% non-condensing |
| Vibration / Shock | 2 G @ 10–500 Hz vibration; 30 G operating / 50 G non-operating shock |
| Emissions | CISPR 11 Class A |
| Certifications | UL Listed, c-UL-us, CSA, CE, ATEX, Australian C-Tick |
| Country of Origin | United States of America |
Main Features and Advantages
Dual-Role Bridge Architecture: The 1756-ENBT functions simultaneously as a backplane-to-Ethernet bridge and a remote I/O adapter, allowing a single module to service programming workstations, HMI clients, SCADA historians, and distributed I/O chassis at the same time. This dual-role capability eliminates the need for separate network interface cards in many ControlLogix architectures, reducing chassis slot consumption and overall system complexity.santaclarasystems.com+1
Balanced Connection Capacity for Plant-Scale Systems: With 64 TCP/IP and 128 CIP connections available in any combination, the 1756-ENBT supports substantial multi-client environments — a typical mid-sized plant node can comfortably host a programming laptop, one or two HMIs, a data historian, and several rack-optimized I/O adapters simultaneously. Engineers managing connection budgets across multiple remote chassis can plan system growth with confidence within this envelope.santaclarasystems.com+1
Efficient 5000 Packet-Per-Second Throughput: The 1756-ENBT delivers up to 5000 I/O packets per second across its connection pool, a figure that comfortably supports dozens of rack-optimized I/O adapters and direct-connect drives on a single module. For applications requiring higher throughput, adding a second ENBT module or migrating to the 1756-EN2T family provides a scalable path without changing the chassis architecture.industrialmonitordirect.com+1
Standard EtherNet/IP Protocol Compliance: As a fully compliant CIP device, the 1756-ENBT interoperates seamlessly with any other EtherNet/IP product — drives, distributed I/O, motor control centers, and third-party devices supporting the Common Industrial Protocol. Configuration through RSLogix 5000 or Studio 5000 Logix Designer uses standard Add-On Profiles, eliminating the custom driver work that often burdens multi-vendor integration.santaclarasystems.com+1
Robust Industrial Design: Tested to 30 G operating shock, 2 G vibration across the 10–500 Hz band, and 5–95% non-condensing humidity, the 1756-ENBT is engineered for the electrical noise, mechanical stress, and thermal variation typical of plant-floor control rooms. Its Class A CISPR 11 emissions profile and 6 kV contact / 8 kV air ESD immunity keep the module stable even in installations with extensive switching loads.santaclarasystems.com
Proven Legacy Platform Reliability: Having served as the ControlLogix EtherNet/IP standard for more than two decades, the 1756-ENBT benefits from an exceptionally mature firmware base, exhaustive field validation across every industrial sector, and extensive Rockwell knowledgebase documentation — making troubleshooting straightforward even for engineers encountering the module for the first time.
