Allen‑Bradley 1756‑EWEB/B – ControlLogix Ethernet Web Server Module for Browser‑Based Monitoring

The 1756‑EWEB/B gives your ControlLogix system a built‑in web interface so engineers can securely monitor controller tags, module diagnostics, and system status from a standard browser. From my experience, it’s a very handy way to expose read‑only process data to maintenance teams or managers without rolling out a full SCADA client. You might notice that for non‑time‑critical views—production counters, OEE snapshots, temperature trends—this module typically does the job with minimal setup.

Our Order Process & Guarantees

• Warranty: 365 days coverage
• Delivery: In‑stock items ship in about 1 week; not more than 1 month at the latest
• Payment: 50% advance payment; full payment before delivery
• Express Options: FedEx, UPS, DHL

Key Features

• Embedded Web Server: View controller tags, module status, and basic diagnostics through a browser (HTTP).
• 10/100Base‑TX Ethernet: Standard RJ45 Ethernet port for easy plant‑network integration.
• User‑Configurable Pages: In many cases, you can publish simple custom web pages to show the data your team actually needs.
• Explicit Messaging over EtherNet/IP: Suited for supervisory reads/writes and diagnostics rather than time‑critical I/O.
• Backplane Integration: Installs in a 1756 ControlLogix chassis and exchanges data with the controller over the backplane.
• Status LEDs: Front indicators for OK and network health make first‑line troubleshooting faster.
• Flexible IP Addressing: Typically supports static IP or BOOTP/DHCP, which helps during commissioning.

Technical Specifications

Brand / Model	Allen‑Bradley 1756‑EWEB/B (ControlLogix Ethernet Web Server Module)
HS Code	8537.10 (Programmable controllers and control panels)
Power Requirements	5.1 VDC supplied from 1756 ControlLogix backplane
Dimensions & Weight	Approx. 145 × 35 × 114 mm (H×W×D); ~0.30 kg (typical ControlLogix single‑slot form)
Operating Temperature	0…60 °C (32…140 °F)
Signal Input/Output Types	No direct discrete or analog I/O; data access via controller tags (read/write by message)
Communication Interfaces / Protocols	1 × 10/100Base‑TX (RJ45), HTTP web server, EtherNet/IP explicit messaging; BOOTP/DHCP or static IP
Installation Method	Mounts in any standard 1756 ControlLogix chassis slot (e.g., 1756‑A4/ A7/ A10/ A13/ A17) with 1756‑PA/ PB power supply

Application Fields

This module is typically chosen when teams want fast, browser‑based visibility into live PLC data without additional HMI licenses. Common scenarios:

• Plant utilities dashboards (boilers, compressors, chillers) viewable from maintenance laptops or tablets.
• OEM machine builders publishing service pages for remote diagnostics and commissioning support.
• Production KPIs and counters for supervisors, where read‑only monitoring is sufficient.
• Lightweight data access for historians or IT scripts via HTTP where hard real‑time isn’t required.

One thing I appreciate is that it keeps the control network clean—explicit messaging and web views are fine for status and recipes, while time‑critical I/O should stay on dedicated 1756‑ENxT modules.

Advantages & Value

• Low Overhead Visibility: Browser access reduces the need for extra HMI clients, which can trim software costs.
• Fits Existing ControlLogix: Full mechanical and electrical compatibility with 1756 chassis—no panel redesign.
• IT‑Friendly: Standard Ethernet, easy IP management, and typically straightforward firewall rules for HTTP.
• Serviceability: Front LEDs and web diagnostics cut time during callouts; in most cases, that means quicker recovery.
• Scalable Architecture: Can be combined with high‑performance 1756‑EN2T/EN3TR modules for I/O while EWEB handles monitoring.

“We stood up a utilities dashboard in a day. The electricians can check compressor load and tank pressures from any browser, which has saved a few after‑hours trips.” — Maintenance Lead, food & beverage plant

Installation & Maintenance

• Cabinet & Chassis: Install in a 1756 chassis with adequate ventilation; keep ambient 0–60 °C and avoid high vibration.
• Wiring: Use industrial‑grade CAT5e/CAT6, proper grounding, and segregate Ethernet away from high‑noise power cables.
• Network Setup: Assign static IP (or BOOTP/DHCP) per site policy; document port usage (HTTP) for IT.
• Security: Limit access to trusted subnets; if user authentication is enabled on pages, assign roles conservatively.
• Maintenance: Periodically back up web content and controller tags; review firmware release notes before any update; clean module vents gently to maintain airflow.
• Spare Strategy: Keeping one spare in stock is common practice due to its role in remote diagnostics.

Quality & Certifications

• CE, UL/cUL listed, and RoHS compliance (typical for 1756 communication modules).
• Manufacturer quality system aligns with ISO practices for industrial controls.
• Warranty provided: 365 days.

Compatible & Supporting Components (for quick builds)

• 1756‑A7 / A10 / A13 / A17 ControlLogix chassis
• 1756‑PA72 / PA75 (AC) or 1756‑PB72 / PB75 (DC) power supplies
• 1756‑EN2T / EN2TR / EN3TR for high‑performance I/O traffic alongside 1756‑EWEB/B for web diagnostics
• Industrial Ethernet switches with VLAN/QoS for clean segregation of control and enterprise traffic

If you’re modernizing a ControlLogix line and want quick visibility without adding a full HMI stack, the 1756‑EWEB/B seems to be a practical, low‑friction step. It’s not intended for hard real‑time I/O, but for dashboards and diagnostics it’s typically more than enough.