Allen-Bradley 1756-ENBT EtherNet/IP Communication Module ControlLogix
Allen-Bradley 1756-ENBT EtherNet/IP module
ControlLogix EtherNet/IP communication module
Allen Bradley ControlLogix network module
Place of Origin:
USA
Brand Name:
Allen-Bradley
Allen-Bradley 1756-ENBT EtherNet/IP module
,ControlLogix EtherNet/IP communication module
,Allen Bradley ControlLogix network module
1756-ENBT
An Ethernet communication interface for ControlLogix industrial networks, controller data exchange and connected-device messaging.
The Allen-Bradley 1756-ENBT connects a ControlLogix chassis to Ethernet-based industrial devices and networks. It supports EtherNet/IP communication for connected equipment, data exchange and message routing.
For maintenance teams supporting installed systems, checking the exact catalog number and module series helps establish the right sourcing and replacement path.
01 / DATATechnical Specifications
| Manufacturer / Brand | Allen-Bradley / Rockwell Automation |
| Catalog number | 1756-ENBT |
| Product family | ControlLogix |
| Module type | EtherNet/IP communication module |
| Network protocol | EtherNet/IP; TCP/IP |
| Ethernet interface | 1 copper RJ45 port, Category 5 Ethernet |
| Communication rate | 10/100 Mbps |
| Maximum TCP connections | 64 |
| Maximum CIP connections | 128 |
| Unconnected CIP messages | 64 backplane + 64 Ethernet |
| Mounting | ControlLogix chassis; any slot |
| Slot width | 1 slot |
| Current draw / Power dissipation | 700 mA at 5.1 V DC; 3 mA at 24 V DC / 3.7 W |
| Thermal dissipation | 12.6 BTU/h |
| Operating temperature | 0 to 60 °C (32 to 140 °F) |
| Storage temperature | −40 to 85 °C (−40 to 185 °F) |
| Relative humidity | 5–95%, non-condensing |
| Enclosure | Open-style; no enclosure rating |
| Isolation voltage | 30 V continuous, basic insulation; Ethernet-to-backplane isolation type-tested at 707 V DC for 60 seconds |
| Ethernet cable | IEEE 802.3-compliant shielded or unshielded twisted-pair cable |
| ESD immunity | 6 kV contact; 8 kV air discharge |
| EFT/B immunity | ±2 kV at 5 kHz on Ethernet ports |
Environmental, EMC & additional technical specifications
| Surge transient immunity | ±2 kV line-to-earth common mode on Ethernet ports |
| Conducted RF immunity | 10 V rms, 1 kHz sine wave, 80% AM, 150 kHz–80 MHz |
| Emissions | CISPR 11, Class A |
| Operating shock | 30 G |
| Non-operating shock | 50 G |
| Vibration | 2 G at 10–500 Hz |
| Redundancy | Not supported |
| Product lifecycle | Discontinued December 31, 2021 |
| Operating environment | 0 to 60 °C (32 to 140 °F); 5–95% relative humidity, non-condensing |
| Storage environment | −40 to 85 °C (−40 to 185 °F) |
Specifications are based on published manufacturer information. Check the module label, series and installed system requirements before ordering.
02 / DIAGNOSTICSApplication & Failure Scenarios
The 1756-ENBT is used in ControlLogix systems for Ethernet communications, including connections to EtherNet/IP devices, data exchange between Logix5000 controllers and routing messages to devices on other networks.
- EtherNet/IP communication is lost or intermittent.
- Connected devices or controller-to-controller data exchanges become unavailable.
- Network-dependent monitoring, control or production coordination is interrupted.
Before replacing the module, check the network cable, switch port, IP configuration, status indicators and controller/network diagnostics. A communication fault alone does not establish that the module has failed.
03 / SYSTEM FITCompatibility & Replacement
Rockwell Automation lists 1756-EN2T as the functional replacement for the discontinued 1756-ENBT. Functional replacement does not guarantee a direct, configuration-free swap in every installed system.
Before substitution, review the ControlLogix chassis, controller and firmware versions, Ethernet addressing, network configuration, communication load and application requirements. Installation and commissioning should follow applicable manufacturer documentation and site procedures.
04 / ORDER SUPPORTDelivery & Warranty
Inspection & testing: Product identity and available condition checks are handled according to the agreed supply terms.
Packaging: Protective packaging is arranged for industrial parts during shipment.
Warranty: Coverage and duration are confirmed in the quotation or order terms.
DOA / returns: Report arrival damage or suspected DOA promptly with order details, photos and test findings. Return authorization and resolution follow the agreed terms.
Industrial automation sourcing for maintenance and replacement projects, with clear part identification and order coordination.
Contact Miya Zheng to discuss availability, supplied condition and delivery arrangements for the 1756-ENBT.
sales@amikon.cn WhatsApp: +86 180 2077 679205 / DOCUMENTATIONTechnical Documents
For technical review, refer to the manufacturer's installation instructions, publication 1756-IN019, and technical data publication 1756-TD003. Search the exact catalog number with 1756-ENBT manual PDF and datasheet when locating the relevant documentation.
06 / FAQFrequently Asked Questions
1. What is the 1756-ENBT used for?
It is a ControlLogix EtherNet/IP communication module used for Ethernet communication with industrial devices, controller data exchange and message routing.
2. Is the Allen-Bradley 1756-ENBT discontinued?
Yes. Rockwell Automation lists December 31, 2021 as its discontinuation date. Availability depends on remaining supply and sourcing options.
3. What is the functional replacement for 1756-ENBT?
Rockwell Automation lists 1756-EN2T as the functional replacement. Confirm the installed system, configuration and application requirements before making a substitution.
4. What should I check if the module cannot communicate?
Check module status indicators, Ethernet cabling, switch connectivity, IP settings, controller configuration and network diagnostics before concluding that the module is defective.
5. What information is needed to request a quotation?
Provide the part number, quantity, destination, required date and machine/system model. Include the module series and relevant application details where available.
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