AB 1756-ENBT/A
AB 1756-ENBT/A
AB 1756-ENBT/A
AB 1756-ENBT/A
AB 1756-ENBT/A
AB 1756-ENBT/A
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  • Lifecycle status

    Discontinued
    Discontinued date: 2021-12-31
    Replacement category: Functional Replacement
    Replacement product: 1756-EN2T

1756-ENBT/A

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Allen-Bradley 1756-ENBT/A is a Series A ControlLogix EtherNet/IP communication bridge with one 10/100 Mbps RJ45 port, 64 TCP connections, and 128 CIP connections.
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Technical specifications for 1756-ENBT/A

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1756-ENBT/A
  • Product Family:
    ControlLogix
  • Product Type:
    EtherNet/IP Communication Bridge Module
  • Stock:
    1
  • EtherNet/IP communication rate:
    10/100 Mbps
  • Ethernet interface:
    1 copper RJ45 Category 5 port
  • TCP connections:
    64
  • CIP connections:
    128
  • CIP unconnected messages:
    64 backplane + 64 Ethernet
  • Current draw:
    700 mA at 5.1 V DC; 3 mA at 24 V DC
  • Power dissipation:
    3.7 W
  • Thermal dissipation:
    12.6 BTU/h
  • Isolation voltage:
    30 V continuous, Ethernet network to backplane; type-tested at 707 V DC for 60 s
  • Slot width:
    1
  • Operating temperature:
    0–60 °C
  • Dimensions:
    3.462 × 14.45 × 14.38 cm
  • Weight:
    0.3 kg
  • Tariff Code:
    8517623990
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Network Migration Installation Application
  • Connects Logix 5000 controllers with EtherNet/IP devices through one 10/100 Mbps copper RJ45 port
  • Supports up to sixty-four TCP connections and one hundred twenty-eight CIP connections
  • Installs in one slot of a standard ControlLogix chassis and can be placed in any slot

1756-ENBT/A is the Series A hardware form of the legacy Allen-Bradley ControlLogix EtherNet/IP bridge module.

It provides a single Category 5 Ethernet port for controller messaging, I/O communication, HMI access, and other supported EtherNet/IP traffic.

Because the product is discontinued, any replacement plan should preserve IP and routing data, review connection capacity and electronic keying, and validate the documented 1756-EN2T functional replacement in the actual architecture.

Availability, condition, price, and shipping time for 1756-ENBT/A are confirmed during quotation.

Allen-Bradley 1756-ENBT/A EtherNet/IP Communication Bridge Module Manuals, Datasheets, Links

Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

  • Count all implicit and explicit CIP connections before approving the module for an existing or expanded system
  • Document the IP address, subnet mask, gateway, host name, and switch-port configuration before removal
  • Use managed-switch diagnostics to check duplicate addresses, duplex mismatch, errors, and unstable links
  • Rockwell identifies 1756-EN2T as the current functional replacement for the discontinued 1756-ENBT
  • Treat migration as an engineering change because firmware, profiles, connection capacity, and network behavior differ
  • Update the Logix project, network documentation, spare-parts list, and recovery procedure after validation
  • Confirm Series A and the selected electronic-keying policy before inserting a replacement
  • Verify chassis power capacity and install the module in a supported ControlLogix chassis slot
  • Inspect the Category 5 cable, RJ45 latch, grounding, routing, and cabinet environment before restart
  • Establishing communication between Logix 5000 controllers over an EtherNet/IP network
  • Connecting ControlLogix controllers with remote EtherNet/IP I/O and compatible field devices
  • Providing EtherNet/IP messaging and controller access for supported HMI, engineering, and supervisory systems
Description
1756-ENBT/A is an Allen-Bradley ControlLogix Series A EtherNet/IP communication bridge for connecting Logix 5000 controllers and Ethernet-network devices.

The single-slot module provides one 10/100 Mbps copper RJ45 port and supports up to 64 TCP and 128 CIP connections within its documented communication limits.

Before replacement, preserve the network configuration and confirm Series A, firmware, electronic keying, IP settings, chassis power, connection loading, cable, switch configuration, and migration requirements.
Revisions

Revision Part #

Also known as

1756-ENBT Ser A
1756-ENBT/A, Series A, Rev A
Alternative Names
1756-ENBT/A 1756ENBT/A 1756 ENBT/A Allen-Bradley 1756-ENBT/A Rockwell Automation 1756-ENBT/A AB 1756-ENBT/A
Technical notes
1756-ENBT/A has one Ethernet RJ45 port, not two. Preserve IP and routing data, verify Series A and firmware, count TCP/CIP connections, and engineer any migration to 1756-EN2T.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Does Allen-Bradley 1756-ENBT/A have one Ethernet port or two?
It has one copper RJ45 Category 5 Ethernet port. A listing that describes two Ethernet ports is not correct for this catalog number.
Can Allen-Bradley 1756-EN2T replace 1756-ENBT/A without engineering changes?
Rockwell lists 1756-EN2T as a functional replacement, but the project, firmware, profiles, network settings, and connection behavior must be reviewed and tested.
What network settings should be backed up before replacing Allen-Bradley 1756-ENBT/A?
Record the IP address, subnet mask, gateway, host name, module slot, electronic-keying choice, message paths, produced/consumed tags, and switch configuration.
Why can Allen-Bradley 1756-ENBT/A show a link but still fail communications?
Check duplicate IP addresses, subnet and gateway errors, switch VLANs, cable condition, duplex negotiation, connection limits, controller paths, and module diagnostics.
How should connection capacity be evaluated for Allen-Bradley 1756-ENBT/A?
Count all explicit and implicit CIP connections plus TCP sessions; the official limit is 64 TCP and 128 CIP connections, shared by the configured applications.
Does Allen-Bradley 1756-ENBT/A support optical fiber directly?
No. The module provides one copper RJ45 port; fiber requires suitable external network equipment or a different supported communication module.
What must be confirmed when buying a spare Allen-Bradley 1756-ENBT/A?
Confirm the complete /A Series, firmware compatibility, front-label condition, RJ45 condition, diagnostic status, repair history, and whether the saved project uses exact or compatible keying.

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