Ethernet Modules | Allen Bradley 1756-EWEB
The Allen Bradley 1756-EWEB is a single-slot ControlLogix communication module that provides web server capability and customized Ethernet/IP data access for ControlLogix systems. Featuring one 10/100 Mbps copper RJ45 port, the module enables custom HTML web pages, data publishing, and XML web services without requiring dedicated PLC programming software. It supports up to 64 TCP/IP socket connections and 128 CIP connections for client/server data exchange across industrial IP networks.
Web Server Services and Data Access
The 1756-EWEB serves built-in or customized web pages stored in system memory, permitting real-time tag extraction and system diagnostics via standard web browsers. It supports XML data views and socket interfaces, allowing non-PLC software applications to send and receive raw TCP or UDP data frames directly through the controller backplane. Operating with 128 explicit CIP messaging connections (originator or target) and up to 64 TCP/IP connections, the module bridges field-level control devices with higher-level supervisory or enterprise IT systems.
Backplane Power and Environmental Ratings
The module mounts into any standard slot of a 1756 ControlLogix chassis and draws operating power directly from the backplane. It draws 700 mA at 5.1V DC and 3 mA at 24V DC, with a maximum backplane power dissipation of 3.65 W. Network connection is established via standard CAT5e/CAT6 Ethernet cables through the front-facing RJ45 connector. Continuous isolation is rated for 30V (or up to 50V depending on installation series) between the Ethernet port and system backplane to protect control hardware from field electrical transients.
| Parameter | Specification |
|---|---|
| Model | 1756-EWEB |
| Brand | Allen Bradley |
| Product Type | Ethernet Web Server Modules |
| Slot Width | 1 slot |
| Communication Ports | 1 x 10/100 Mbps RJ45 copper |
| TCP/IP Connections | 64 max |
| CIP Connections | 128 max (explicit messaging) |
| Motion Axes Supported | 0 |
| Backplane Current Draw | 700 mA @ 5.1 VDC / 3 mA @ 24 VDC |
| Power Dissipation | 3.65 W max |
| Isolation Voltage | 30V continuous (Ethernet network to backplane) |
| Operating Temperature | 0 to 60 deg C (32 to 140 deg F) |
| Storage Temperature | -40 to 85 deg C (-40 to 185 deg F) |
| Relative Humidity | 5–95% non-condensing |
| Enclosure | None (open-style) |
| Module Weight | 0.22 kg (0.49 lbs) |
Installation Guidelines
Before inserting or removing the 1756-EWEB module from a 1756 chassis, verify that backplane power is removed or that the surrounding location is non-hazardous. Connect an industrial-grade RJ45 Ethernet cable to the front port, ensuring minimum bend radius rules are observed. Configure module IP parameters using the BOOTP/DHCP utility or standard Rockwell software tools prior to building custom HTML web pages.
Frequently Asked Questions
Q: Does the 1756-EWEB module support CIP Motion or axis control on EtherNet/IP? A: No. The 1756-EWEB is designed specifically for web serving, custom socket communications, and data access; it supports 0 motion axes.
Q: What is the maximum number of simultaneous TCP/IP and CIP connections supported by the 1756-EWEB? A: The module supports up to 64 simultaneous TCP/IP connections and 128 explicit CIP messaging connections.
Ethernet Modules | Allen Bradley 1756-EWEB
Ethernet Modules | Allen Bradley 1756-EWEB
The Allen Bradley 1756-EWEB is a single-slot ControlLogix communication module that provides web server capability and customized Ethernet/IP data access for ControlLogix systems. Featuring one 10/100 Mbps copper RJ45 port, the module enables custom HTML web pages, data publishing, and XML web services without requiring dedicated PLC programming software. It supports up to 64 TCP/IP socket connections and 128 CIP connections for client/server data exchange across industrial IP networks.
Web Server Services and Data Access
The 1756-EWEB serves built-in or customized web pages stored in system memory, permitting real-time tag extraction and system diagnostics via standard web browsers. It supports XML data views and socket interfaces, allowing non-PLC software applications to send and receive raw TCP or UDP data frames directly through the controller backplane. Operating with 128 explicit CIP messaging connections (originator or target) and up to 64 TCP/IP connections, the module bridges field-level control devices with higher-level supervisory or enterprise IT systems.
Backplane Power and Environmental Ratings
The module mounts into any standard slot of a 1756 ControlLogix chassis and draws operating power directly from the backplane. It draws 700 mA at 5.1V DC and 3 mA at 24V DC, with a maximum backplane power dissipation of 3.65 W. Network connection is established via standard CAT5e/CAT6 Ethernet cables through the front-facing RJ45 connector. Continuous isolation is rated for 30V (or up to 50V depending on installation series) between the Ethernet port and system backplane to protect control hardware from field electrical transients.
| Parameter | Specification |
|---|---|
| Model | 1756-EWEB |
| Brand | Allen Bradley |
| Product Type | Ethernet Web Server Modules |
| Slot Width | 1 slot |
| Communication Ports | 1 x 10/100 Mbps RJ45 copper |
| TCP/IP Connections | 64 max |
| CIP Connections | 128 max (explicit messaging) |
| Motion Axes Supported | 0 |
| Backplane Current Draw | 700 mA @ 5.1 VDC / 3 mA @ 24 VDC |
| Power Dissipation | 3.65 W max |
| Isolation Voltage | 30V continuous (Ethernet network to backplane) |
| Operating Temperature | 0 to 60 deg C (32 to 140 deg F) |
| Storage Temperature | -40 to 85 deg C (-40 to 185 deg F) |
| Relative Humidity | 5–95% non-condensing |
| Enclosure | None (open-style) |
| Module Weight | 0.22 kg (0.49 lbs) |
Installation Guidelines
Before inserting or removing the 1756-EWEB module from a 1756 chassis, verify that backplane power is removed or that the surrounding location is non-hazardous. Connect an industrial-grade RJ45 Ethernet cable to the front port, ensuring minimum bend radius rules are observed. Configure module IP parameters using the BOOTP/DHCP utility or standard Rockwell software tools prior to building custom HTML web pages.
Frequently Asked Questions
Q: Does the 1756-EWEB module support CIP Motion or axis control on EtherNet/IP? A: No. The 1756-EWEB is designed specifically for web serving, custom socket communications, and data access; it supports 0 motion axes.
Q: What is the maximum number of simultaneous TCP/IP and CIP connections supported by the 1756-EWEB? A: The module supports up to 64 simultaneous TCP/IP connections and 128 explicit CIP messaging connections.
