Allen-Bradley 1756-ENBT ControlLogix EtherNet/IP Communication Module

Product Overview

The Allen-Bradley 1756-ENBT is a high-performance EtherNet/IP communication module designed for Rockwell Automation's ControlLogix programmable automation controller system. This module serves as a critical communication interface that enables ControlLogix controllers to connect to EtherNet/IP networks, facilitating seamless data exchange with various industrial devices and systems. As part of the integrated architecture system, the 1756-ENBT provides a robust solution for industrial automation applications requiring reliable communication, distributed I/O control, and network connectivity.

The 1756-ENBT exemplifies Rockwell Automation's commitment to industrial networking excellence and system integration. Its sophisticated design allows for efficient communication between ControlLogix systems and other devices on the EtherNet/IP network, supporting real-time control, data collection, and device configuration across multiple industries including manufacturing, process control, and infrastructure automation.

Key Features and Capabilities

Network Communication Performance

The 1756-ENBT features impressive communication capabilities with support for up to 64 TCP connections and 128 CIP (Common Industrial Protocol) connections

. This substantial connection capacity allows simultaneous communication with multiple devices without requiring additional multiplexing equipment, enhancing system efficiency and reducing hardware costs.

The module operates at 10/100 Mbps communication speeds with auto-negotiation functionality, ensuring compatibility with various network infrastructure components

.

System Integration and Flexibility

A standout feature of the 1756-ENBT is its ability to serve as both a communication interface and a remote I/O adapter

.

The module supports linear network topology through its embedded RJ45 communication port and includes a USB 1.1 configuration port for local setup and maintenance

. This dual-port design provides flexibility for different installation and configuration scenarios.

Diagnostic and Monitoring Capabilities

The 1756-ENBT incorporates comprehensive diagnostic features accessible through standard web browsers

. Users can monitor critical parameters including:

• IP traffic statistics

• TCP and UDP communication metrics

• Conflict histograms

• Connection management status

• Module version information

• Network storm information

• System uptime statistics

These diagnostic capabilities enable proactive maintenance and rapid troubleshooting, reducing system downtime and improving overall operational efficiency.

Industrial Robustness and Compatibility

Designed for harsh industrial environments, the 1756-ENBT operates reliably with backward compatibility features, ensuring integration with existing ControlLogix systems

.

Technical Specifications

The following table summarizes the key technical specifications of the Allen-Bradley 1756-ENBT communication module:

System Configuration and Installation

Hardware Integration

The 1756-ENBT module is designed for simple installation in any slot of compatible ControlLogix chassis, including 1756-A4, A7, A10, A13, and A17 models. The module features a standardized form factor that ensures seamless integration with existing ControlLogix systems. The absence of a rotary switch simplifies installation and configuration procedures

.

For network connectivity, the module utilizes a standard RJ45 connector for EtherNet/IP communication and a USB type-B connector for local configuration. This combination provides flexibility for both network integration and local maintenance activities.

Software Configuration

The 1756-ENBT is configured using Rockwell Automation's Studio 5000 Logix Designer software, which provides comprehensive tools for parameter setting, monitoring, and diagnostics. Configuration tasks include:

• IP address assignment and network parameter configuration

• Connection management for optimized communication performance

• Diagnostic enabling for proactive fault detection and notification

• Security setting implementation for network protection

The module's integrated web server functionality allows for remote monitoring and configuration access through standard web browsers, enabling maintenance personnel to assess system status without specialized software tools

.

Network Integration

The 1756-ENBT supports bridge communication across different networks, including EtherNet/IP, ControlNet, DeviceNet, and RS-232 serial networks

. This bridging capability enables seamless data exchange between devices on different network types, enhancing system flexibility and integration possibilities.

However, it's important to note that EtherNet/IP I/O cannot be bridged across networks

.

Applications

The 1756-ENBT communication module is suitable for a wide range of industrial automation applications:

• Manufacturing Automation: Enabling communication between ControlLogix controllers and various devices on the plant floor, supporting real-time control and monitoring of production equipment

• .

• Process Control: Facilitating data exchange in chemical, pharmaceutical, and food processing plants where reliable communication is essential for process optimization and safety

• .

• Energy Management: Supporting monitoring and control applications in power generation and distribution systems, enabling efficient energy utilization

• .

• Water and Wastewater Treatment: Providing communication infrastructure for distributed control systems in treatment plants and pumping stations

• .

• Building Automation: Integrating industrial control systems with building management systems for comprehensive facility automation

• .

The module's robust communication capabilities and flexible integration options make it particularly valuable for applications requiring distributed control architectures and seamless data exchange between different automation components.

Comparison and Considerations

When selecting the 1756-ENBT module, consider the following aspects:

• Network Requirements: The module's support for 64 TCP and 128 CIP connections is sufficient for most medium-sized applications; larger systems may require additional communication modules.

• Topology Limitations: The module only supports linear network topology due to its single embedded Ethernet communication port; applications requiring redundant ring topologies may need alternative solutions

• .

• System Compatibility: The module works with ControlLogix systems; verify compatibility with your existing controller and chassis components.

• Environmental Conditions: The operating temperature range (0-60°C) is suitable for most industrial environments; extreme conditions may require additional protection.

• Future Expansion: Consider future network expansion needs and whether the module's connection capacity will accommodate anticipated system growth.

For applications requiring different communication capabilities, Rockwell Automation offers other modules in the 1756 series, such as the 1756-EN2T (with enhanced performance) and 1756-CNBR (ControlNet communication module).

Conclusion

The Allen-Bradley 1756-ENBT ControlLogix EtherNet/IP Communication Module is a robust and reliable solution for industrial automation applications requiring seamless network connectivity and distributed control capabilities. Its substantial connection capacity, comprehensive diagnostic features, and flexible integration options make it suitable for diverse applications across manufacturing, process control, and infrastructure automation.

With excellent communication performance, web-based monitoring capabilities, and backward compatibility with existing ControlLogix systems, the 1756-ENBT helps improve system integration and reduce downtime through reliable network connectivity. Its rugged design ensures consistent performance even in challenging industrial environments, making it a valuable component in modern automation systems.

For engineers and system integrators seeking a proven communication solution with seamless integration into Allen-Bradley ControlLogix systems, the 1756-ENBT represents an excellent choice that combines performance, reliability, and durability characteristic of the Allen-Bradley brand. While newer modules may offer enhanced features, the 1756-ENBT remains a dependable workhorse for industrial network communication applications worldwide.