1756-ENBT | Allen-Bradley ControlLogix Ethernet Bridge Supplier

Introduction to the 1756-ENBT ControlLogix EtherNet/IP Bridge Module

When your automation system demands reliable, high-speed communication between controllers and devices, the 1756-ENBT from Allen-Bradley delivers. As part of the ControlLogix series, this Ethernet communication module supports 10/100 Mbps data rates and up to 64 TCP/IP connections, enabling efficient data transfer across your network. By consolidating control, configuration, and data collection onto a single EtherNet/IP network, the 1756-ENBT helps reduce maintenance costs and simplify network architecture.

Key Features & Technical Specifications of the 1756-ENBT

• Manufactured by Rockwell Automation under the Allen-Bradley brand.
• Module type: Ethernet Communication Module for the ControlLogix platform.
• Supports EtherNet/IP communication at 10/100 Mbps in half or full duplex mode.
• Current draw: 700 mA at 5.1 VDC and 3 mA at 24 VDC.
• Integrated ports: one RJ45 Ethernet port and one USB 1.1 configuration port.
• Insulation voltage: 30 Volts continuous.
• Enclosure rating: Open (requires installation in a suitable chassis).
• Mounts in any slot of a ControlLogix chassis, occupying a single slot.
• Operating temperature range: 32 to 140 °F (0 to 60 °C).
• Power dissipation: 3.7 W; thermal dissipation: 12.6 BTU/hr.
• Supports up to 64 TCP/IP connections and 128 CIP connections (I/O and information).
• Maximum multicast tags: 32; unicast available from RSLogix 5000 version 16.03.00 or later.
• Packet rate capacity: 500 I/O packets per second and 900 HMI/MSG packets per second.

One distinctive spec is the support for 64 TCP/IP and 128 CIP connections, which allows simultaneous communication with multiple devices without requiring a multiplexer. This reduces hardware costs and simplifies network design.

Cost-Effective Applications for the 1756-ENBT

In high-speed processor interlocking and distributed I/O control, the 1756-ENBT enables real-time data exchange over a single EtherNet/IP backbone. For example, a manufacturing line can use this module to route data to devices on different NetLinx networks, cutting back on the number of networks required and reducing overall support expenses. The module also acts as a Remote I/O Adapter when placed in a remote chassis, allowing remote configuration and data collection from analog, input, or output modules—further lowering installation and cabling costs.

Installation & Setup Guide for the 1756-ENBT

Install the 1756-ENBT in any slot of a ControlLogix chassis. The module occupies one slot width and does not include rotary switches; configuration is performed via software. Connect the RJ45 port to your Ethernet network using a standard twisted-pair cable. Use the USB 1.1 port for initial configuration or diagnostics. Ensure the chassis provides adequate ventilation within the 32 to 140 °F operating range. Refer to the official Allen-Bradley installation manual for detailed wiring and grounding instructions.

Maintenance & Reliability Tips for the 1756-ENBT

To maintain reliable operation, periodically inspect the module and its connections for dust or damage. The open enclosure design requires a clean, dry environment. Regular monitoring of diagnostic information via the web interface—such as IP traffic, connection management, and network storm data—can help identify issues early. Following these practices extends module life and reduces unplanned downtime, contributing to long-term cost savings.

Compatibility & Integration of the 1756-ENBT

The 1756-ENBT integrates seamlessly with ControlLogix controllers and supports EtherNet/IP protocol. It is backward compatible with earlier ControlLogix modules and can communicate with devices on other NetLinx networks when used as a backbone. The module supports SNMP (password required) and duplicate IP detection starting from revision 3.3. For unicast support, RSLogix 5000 version 16.03.00 or later is required. This broad compatibility simplifies system upgrades and expansions.

Frequently Asked Questions about the 1756-ENBT

Q: How many TCP/IP connections does the 1756-ENBT support?

A: The module supports a maximum of 64 TCP/IP connections.

Q: What is the power dissipation of the 1756-ENBT?

A: The power dissipation is 3.7 W, with a thermal dissipation of 12.6 BTU/hr.

Q: Does the 1756-ENBT support unicast communication?

A: Yes, unicast is available when using RSLogix 5000 software version 16.03.00 or later.

Q: What ports are integrated into the 1756-ENBT?

A: It has one RJ45 Ethernet port and one USB 1.1 configuration port.

Q: Can the 1756-ENBT be used as a Remote I/O Adapter?

A: Yes, when placed in a remote I/O chassis, it can act as a Remote I/O Adapter for collecting and configuring data from ControlLogix modules.

Product Support & Availability from Petro Auto Tech

The 1756-ENBT is available from Petro Auto Tech, an industrial automation parts supplier. Contact our team for current stock levels and ordering information. We provide fast shipping and dedicated support to keep your operations running efficiently.