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Description
Application Scenarios
A system integrator commissioning a remote pumping station needs to give the plant’s maintenance supervisor read access to flow totals and alarm status without installing a dedicated HMI or SCADA client. The 1756-EWEB in the ControlLogix chassis serves a data view page accessible from any browser on the plant network: the supervisor opens a URL, sees live tag values, and can acknowledge a high-level alarm by writing to a controller tag—provided the data view was configured with write access . For a satellite facility where a full HMI station cannot be justified, the 1756-EWEB delivers a lightweight monitoring path using infrastructure that already exists: the plant Ethernet network and a browser.
Parameter
| Parameter | Value/Description |
|---|---|
| Product Model | 1756-EWEB |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Product Category | ControlLogix EtherNet/IP Web Server Module |
| Ethernet Interface | 1 × Copper RJ45, 10/100 Mbps |
| TCP/IP Connections | 64 |
| Logix Connections | 128 |
| Backplane Current | 700 mA @ 5.1 VDC; 3 mA @ 24 VDC |
| Power Dissipation | 3.7 W |
| Isolation | 30 V continuous (basic insulation, Ethernet to backplane) |
| Operating Temperature | 0°C to +60°C |
| Slot Width | 1 |
| Lifecycle Status | Discontinued June 30, 2023; engineered replacement required |
Technical Principles and Innovative Values
Innovation Point 1: Browser-Based Tag Access Without Middleware. The 1756-EWEB hosts its own web server and reads controller-scoped tags directly from the local ControlLogix chassis. An engineer creates a data view by specifying the controller slot, tag name, and display format; the module then renders the values as an XML-backed web page . No OPC server, no dedicated HMI runtime, and no PC between the controller and the browser.
Innovation Point 2: Email and Socket Services for Event Notification. The 1756-EWEB can send email through a configured SMTP server, either from its own web interface or triggered by a controller MSG instruction . It also supports open socket services, allowing the ControlLogix controller to exchange raw TCP or UDP data with non-EtherNet/IP devices such as barcode scanners or legacy weighing terminals—an unusual capability for a Rockwell communication module of its generation .
Innovation Point 3: CIP Bridging with Configurable Disable. The module can bridge EtherNet/IP devices to the backplane and vice versa, routing messages between the plant network and other modules in the chassis. Critically, this bridging can be disabled—a security feature that Rockwell’s migration guide identifies as a distinct function requiring replacement via CIP Security on modern EtherNet/IP modules .
