1756-EWEB

The Allen-Bradley 1756-EWEB is a ControlLogix communication module designed to extend PLC system accessibility through built-in web server functionality. Unlike standard Ethernet modules, it enables engineers to remotely view controller data, diagnostics, and system status directly through a web browser interface.

This module was introduced as part of Rockwell Automation’s early industrial web integration strategy, offering a bridge between plant-floor control systems and IT-level visibility. Although now discontinued, it remains widely used in legacy systems where remote monitoring and XML-based data access are required.

Technical Specifications

Category	Specification
Product Type	Ethernet Web Server Communication Module
Series	ControlLogix 1756
Network Protocol	EtherNet/IP
Ethernet Interface	1 × RJ45 (10/100 Mbps)
Web Function	Embedded industrial web server
Data Access	Controller tags, diagnostics, system status
Power Consumption	~3.7 W
Backplane Current	~700 mA @ 5V DC
Operating Temperature	0°C to 60°C
Dimensions (H × W × D)	13.3 × 14.5 × 5.1 cm
Weight	~1.27 lbs (≈0.58 kg)

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Applications

The 1756-EWEB is commonly found in industrial environments requiring remote visibility and simplified data access:

Remote plant monitoring via web browser
SCADA and HMI data visualization systems
Industrial diagnostics and maintenance dashboards
Legacy system integration with IT networks
Alarm notification and event reporting systems
Manufacturing process transparency and reporting

Its ability to expose controller data through standard web technologies made it a pioneering module in early Industrial IoT-style architectures.

Advantages

Built-in web server for direct browser-based access
Simplifies remote monitoring without additional software tools
Supports EtherNet/IP communication within ControlLogix systems
Enables XML-based data exchange with enterprise applications
Reduces engineering overhead for diagnostic visibility
Strong integration with legacy Rockwell automation platforms
Proven stability in long-term industrial deployments

Technical FAQs

1. What is the main purpose of the 1756-EWEB?
It provides web-based access to ControlLogix controller data and diagnostics.

2. Is the 1756-EWEB still manufactured?
No, it is discontinued but still widely used in existing systems.

3. What communication protocol does it use?
It uses EtherNet/IP for industrial communication.

4. Can I access PLC data through a browser?
Yes, it serves web pages displaying controller and system data.

5. What is its Ethernet speed?
It supports 10/100 Mbps Ethernet communication.

6. Does it support modern cybersecurity features?
No, it lacks modern security features and requires network isolation in most applications.

7. What is its weight?
Approximately 1.27 lbs (0.58 kg).

8. Can it send alarms or notifications?
Yes, it can generate email or pager-based alerts in supported configurations.

9. What software is required to use it?
A standard web browser is sufficient for viewing data.

10. What replaced the 1756-EWEB?
Modern Ethernet/IP communication modules like 1756-EN2T and newer Logix platforms with integrated diagnostics.

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Allen Bradley 1756-EWEB ControlLogix Web Server Communication Module