Allen-Bradley 1756-EWEB ControlLogix EtherNet/IP Web Server Module

Allen-Bradley 1756-EWEB EtherNet/IP Web Server Module – ControlLogix 1756 Series

Picture a critical production line running three shifts — a conveyor fault develops at 2:47 AM, but the on-call engineer is 40 km from the plant. Without a dedicated web server module in the ControlLogix rack, the only option is a physical site visit or a blind phone call to the floor operator. The 1756-EWEB eliminates that scenario entirely: it embeds a standards-compliant HTTP/HTTPS server directly into the 1756 backplane, giving authorized personnel live tag data, controller diagnostics, and I/O status through any modern web browser — no proprietary client software, no VPN client installation on the remote device.

Within the ControlLogix 1756 platform, the 1756-EWEB occupies a distinct role: it is not a general-purpose EtherNet/IP scanner (that is the 1756-EN2T/EN3TR family), but a purpose-built data-publishing module. It reads controller tags via the backplane and serves them over HTTP, making it the preferred choice for supervisory dashboards, OEM remote support portals, and facilities where IT policy restricts SCADA server deployment on the plant floor. Globally, the 1756 ControlLogix platform is installed in tens of thousands of process and discrete manufacturing facilities; the 1756-EWEB is the standard web-access component for that installed base.

Technical Specifications

Electrical

• Backplane Current Draw: 250 mA @ 5 VDC; 3 mA @ 24 VDC
• Power Dissipation: 1.3 W (typical)
• Network Interface: 10/100 Mbps Ethernet, RJ-45, auto-negotiate, full/half duplex
• Supported Protocols: EtherNet/IP (CIP), HTTP, HTTPS, FTP, SMTP, SNTP
• Web Server Connections: Up to 10 simultaneous browser sessions
• Tag Data Refresh Rate: Configurable; minimum ~500 ms via HTTP polling

Mechanical

• Form Factor: Single-slot ControlLogix 1756 chassis module
• Dimensions: 94.0 mm H × 54.9 mm W × 87.4 mm D (standard 1756 profile)
• Weight: Approx. 200 g
• Connector: RJ-45 (front-panel Ethernet port)
• Chassis Compatibility: Any 1756 chassis (4-, 7-, 10-, 13-, 17-slot)

Environmental

• Operating Temperature: 0 °C to +60 °C
• Storage Temperature: −40 °C to +85 °C
• Relative Humidity: 5–95% non-condensing
• Vibration: IEC 60068-2-6 compliant
• Shock: IEC 60068-2-27 compliant
• Enclosure Rating: Open-type (requires installation in rated enclosure)

Certifications & Standards

• UL Listed (UL 508)
• CE Marked (EMC Directive 2014/30/EU; LVD 2014/35/EU)
• ODVA EtherNet/IP Conformance Tested
• RoHS Compliant
• Industry Standard Reference: IEC 61158 (Fieldbus), IEEE 802.3 (Ethernet)

Key Features & Benefits

• Browser-native remote monitoring — Engineers access live controller tags from any HTML5 browser without installing Rockwell software on the remote device, reducing IT overhead and enabling support from mobile devices on the plant floor.
• Up to 10 simultaneous web sessions — Multiple supervisors, maintenance technicians, and OEM support staff can view real-time data concurrently without contention, eliminating the single-user bottleneck common in legacy HMI remote-access setups.
• HTTPS encrypted data transport — Tag data is served over TLS, satisfying IT security policies in regulated industries (pharmaceutical GMP, food safety, utilities) where unencrypted plant-floor data on the corporate LAN is prohibited.
• SMTP email alarming — The module can send email notifications directly on configurable tag conditions, providing a lightweight alarm path that does not require a SCADA server or historian to be online — critical for unmanned substations and remote pump stations.
• Single-slot backplane integration — Consumes only 250 mA at 5 VDC from the 1756 chassis power supply; no external power wiring required, simplifying panel design and reducing installation time by approximately 30 minutes per rack compared to external gateway solutions.
• ODVA EtherNet/IP Conformance Tested — Guarantees interoperability with third-party EtherNet/IP devices and SCADA systems that implement the CIP standard (IEC 61158-3-2), protecting the customer’s network investment as the system evolves.

Industry & Equipment Applications

• Oil & Gas — Pipeline & Wellhead Automation: Installed in remote RTU panels to provide web-based SCADA visibility for flow computers, pressure transmitters, and ESD systems without dedicated communication servers at each site.
• Water & Wastewater — Pump Stations & Lift Stations: Enables municipal operators to monitor pump run-hours, flow totals, and fault codes from a central dispatch browser, reducing truck rolls for routine status checks.
• Automotive — Body-in-White Welding Lines: Provides OEM machine builders a secure remote-support portal into customer ControlLogix systems, allowing firmware updates and parameter adjustments without on-site visits during production windows.
• Food & Beverage — CIP (Clean-in-Place) Systems: Supervisors monitor wash cycle parameters (temperature, conductivity setpoints, timer status) in real time from the plant office, supporting GMP documentation requirements.
• Power Generation — Auxiliary Control Panels: Integrated into generator excitation and cooling system controllers to give plant engineers web-based visibility into auxiliary equipment status alongside the main DCS.
• Pharmaceutical — Batch Manufacturing: Supports 21 CFR Part 11-adjacent architectures by providing a read-only web view of batch controller tags for QA review, without granting write access to the production controller.

System Integration & Compatible Parts

Upstream / Rack Components:

• 1756-L7x / 1756-L8x ControlLogix Controllers (any firmware revision supporting the 1756-EWEB)
• 1756-PA72 / 1756-PB72 / 1756-PH75 Chassis Power Supplies
• 1756-A4 / 1756-A7 / 1756-A10 / 1756-A13 / 1756-A17 Chassis

Downstream / Network Components:

• Stratix 5700 / 5400 Managed Ethernet Switches (recommended for segmented plant network)
• 1783-NATR NAT Router (for isolating the 1756-EWEB on a DMZ segment)

Functional Alternatives (with caveats):

• 1756-EN2T / 1756-EN2TR: General EtherNet/IP scanner/adapter — provides CIP messaging but no built-in web server; requires separate SCADA/HMI software for remote visualization. Use the EN2T when EtherNet/IP I/O scanning is the primary requirement.
• 1756-EN3TR: Dual-port ring topology EtherNet/IP module — no web server function; appropriate for DLR (Device Level Ring) network architectures.
• Third-party OPC-UA gateways (e.g., Kepware): Can replicate web-dashboard functionality but add software licensing cost and an additional server dependency.

Our Quality Assurance Process

Every 1756-EWEB unit sourced by Konmask.com passes a four-stage inspection before shipment:

1. Visual & Physical Inspection: Examination of PCB, connector pins, front-panel label, and firmware revision sticker against Allen-Bradley factory specifications. Units with bent pins, cracked housings, or missing labels are rejected.
2. Functional Power-On Test: Module is seated in a live 1756 chassis; backplane communication, Ethernet link negotiation, and web server HTTP response are verified.
3. Firmware Version Verification: Firmware revision is recorded and cross-referenced against Rockwell Automation’s published compatibility matrix for the target controller firmware.
4. Packaging & ESD Protection: Units are re-packaged in anti-static bags with desiccant, bubble wrap, and double-wall cartons rated for international air/sea freight.

Documentation available upon request: Test report, firmware revision record, photos of physical unit, certificate of conformance, and original Rockwell Automation product documentation reference.

How to Order

1. Submit an Inquiry: Use the contact form on this page or email support@konmask.com with your required quantity, target delivery date, and destination country.
2. Receive a Quotation: Our team will respond within 24 hours with pricing, lead time, available stock quantity, and shipping options (DHL / FedEx / sea freight).
3. Confirm & Ship: Upon order confirmation and payment, we prepare export documentation (commercial invoice, packing list, COO) and dispatch with full tracking information provided.

Why Choose Konmask.com?

• Specialized in Industrial Automation Components: We focus exclusively on PLC, DCS, and control system hardware — Allen-Bradley, Siemens, ABB, Schneider, Honeywell — giving us deeper sourcing networks and technical knowledge than general electronics distributors.
• Verified Stock with Traceability: Every unit is physically inspected and documented before listing. We do not list stock we cannot verify.
• 24-Hour Inquiry Response: Dedicated B2B sales engineers respond to all technical and commercial inquiries within one business day, including firmware compatibility questions.
• Global Export Experience: We ship to over 50 countries with full export documentation, including commercial invoices, packing lists, and certificates of origin for customs clearance.
• Long-term Supply Partnership: Many of our customers are MRO buyers and system integrators who return for repeat orders. We maintain preferred pricing and priority allocation for established accounts.

Frequently Asked Questions

Q: Is the Allen-Bradley 1756-EWEB compatible with all ControlLogix controller firmware versions?

A: Compatibility depends on both the 1756-EWEB firmware revision and the Logix controller firmware. Rockwell Automation publishes a compatibility matrix in the 1756-EWEB User Manual (Publication 1756-UM527). We verify the firmware revision of every unit we ship and can confirm compatibility with your specific controller version upon inquiry — please provide your 1756-Lxx catalog number and current firmware revision.

Q: Can the 1756-EWEB be used to write tag values remotely, or is it read-only?

A: The 1756-EWEB supports both read and write access to controller tags via its web interface, subject to the access permissions configured in RSLogix 5000 / Studio 5000. For security-sensitive applications (pharmaceutical batch, utility SCADA), it is common practice to configure the module for read-only web access while reserving write access to the engineering workstation on the local network.

Q: What is the difference between the 1756-EWEB and the 1756-EN2T for remote EtherNet/IP access to a ControlLogix system?

A: The 1756-EN2T is a general-purpose EtherNet/IP communication module used for I/O scanning, produced/consumed tags, and MSG instructions — it has no built-in web server. The 1756-EWEB is specifically designed to publish controller tag data over HTTP/HTTPS to web browsers, making it the correct choice when the requirement is browser-based remote monitoring without a dedicated SCADA server. Many installations use both modules in the same chassis for different purposes.

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