Product Overview
The Allen-Bradley 1756-ENET is a ControlLogix EtherNet/IP bridge module that connects your ControlLogix chassis to an Ethernet network. As a maintenance engineer, you know legacy systems still run critical processes. This module keeps that link alive. It supports scanner and adapter modes, messaging, and real-time I/O data. The 1756-ENET is discontinued, but Oil AutoTech specializes in fast-dispatch spares for oil, gas, and industrial automation. We help you find this exact module when downtime is not an option.
Technical Specifications
| Specification | Value |
|---|---|
| Communication Ports | One (1) Ethernet; One (1) AUI Port |
| Ethernet Data Transfer Speed | 10 Mbps |
| Supported Topologies | Linear |
| Supported Functions | Scanner / Adapter; Messaging |
| Backplane Current Consumption | 350 mA |
| Compatible Chassis | Series A and B: 1756-A4, -A7, -A10, -A13 |
| Compatible Power Supply | 1756-PA72 and 1756-PB72 |
| Module LEDs | TXD; RXD; OK |
| Slot Width | 1-slot |
| Product Lifecycle | Discontinued |
These specs matter in the field. The 10 Mbps Ethernet speed suits deterministic control traffic on legacy lines. The linear topology simplifies daisy-chain layouts. Scanner/adapter flexibility lets you swap roles without changing hardware. The 350 mA backplane draw is modest, so it won’t strain your power supply. And the TXD, RXD, and OK LEDs give you instant visual health checks during rounds.
Installation and Setup
Mount the 1756-ENET in any slot of a compatible 1756-A4, -A7, -A10, or -A13 chassis. Pair it with a 1756-PA72 or 1756-PB72 power supply. For wiring, use unshielded RJ45 Category 5 twisted-pair cable. Define IP address, subnet mask, and gateway before going online. The module’s MAC address sits behind the front swing door. Check it during commissioning and label the cable. Because the 1756-ENET is discontinued, confirm you have the correct replacement on hand before pulling the old unit. Oil AutoTech offers hands-on technical selection help to match your chassis and power supply.
Maintenance and Reliability
From a maintenance engineer’s view, reliability starts with simple checks. Inspect the TXD, RXD, and OK LEDs weekly. A dark OK LED points to a backplane or power issue. Clean the swing door area to keep the MAC label readable. Keep spare RJ45 cables on the shelf. Because this module is discontinued, treat every unit as critical. A failed 1756-ENET can halt production. That is why fast dispatch, worldwide matters. Oil AutoTech stocks ready-to-ship spares so you avoid long lead times and costly downtime.
Compatibility and Integration
The 1756-ENET works within the ControlLogix platform. It supports Common Industrial Protocol (CIP) and encapsulates messages in standard TCP/IP. You can use it for distributed I/O, messaging, and tag sharing. It acts as a scanner or adapter, giving you network flexibility. Note: wiring into EtherNet/IP networks may require an external gateway or connection module. Confirm cables and gateways with your supplier. The module fits Series A and B chassis and works with 1756-PA72 and 1756-PB72 power supplies. If you run mixed legacy and modern ControlLogix hardware, verify firmware compatibility before installation.
Selection Guide
Before you buy, verify your chassis series, power supply model, and network topology. Check that your application needs 10 Mbps, not 100 Mbps. Confirm you have RJ45 Category 5 cable and a defined IP plan. Since the 1756-ENET is discontinued, ask about replacement options like the 1756-ENBT. Oil AutoTech provides practical selection help and quick worldwide delivery. Contact Oil AutoTech today for pricing and availability.
Frequently Asked Questions
Is the 1756-ENET still available?
It is discontinued, but Oil AutoTech may have ready-to-ship stock. Contact us for current availability.
What is the difference between the 1756-ENET and 1756-ENBT?
The 1756-ENBT is the newer replacement. The 1756-ENET runs at 10 Mbps; the ENBT offers higher speed. Confirm compatibility with your chassis and power supply.
Can I use the 1756-ENET in any ControlLogix chassis?
It fits Series A and B chassis: 1756-A4, -A7, -A10, and -A13. Use with 1756-PA72 or 1756-PB72 power supplies.
What do the LEDs on the 1756-ENET indicate?
TXD shows transmit activity, RXD shows receive activity, and OK shows overall module status. Use them for quick fault diagnosis.
Does the 1756-ENET support real-time I/O?
Yes. It supports scanner/adapter mode and messaging for real-time I/O data over EtherNet/IP.
