Overview
The Allen-Bradley 1756-ENBT is a ControlLogix communication module designed to facilitate high-speed Ethernet-based data exchange in industrial automation systems. This module belongs to the 1756 series of ControlLogix Communication Modules and works as a bridge between two or more devices like controllers and I/O modules. It operates with EtherNet/IP, an open industrial networking standard that supports real-time I/O messages and enables users to connect control I/O and drives while communicating with other Ethernet/IP devices.
Key Features
- Ethernet speed of 10 to 100 Mbps with auto-negotiation for flexible network adaptation
- Up to 64 TCP and 128 CIP connections, allowing efficient data exchange between controllers, I/O modules, and other devices
- Single RJ45 Ethernet port supporting Category 5 twisted-pair cabling with half/full duplex mode
- Web-enabled diagnostics providing access to settings and internal diagnostics including IP traffic, TCP, UDP, collision histogram, and connection management
- Supports real-time I/O messaging, information exchange, general messaging, and meets the common industry protocol (CIP) for safety in data transmission
- Can be installed in any slot of the ControlLogix chassis
Technical Specifications
- Communication Rate: 10/100 Mbps
- Connections: 64 TCP connections and 128 CIP connections
- Current Draw: 700 mA at 5.1 Volts DC and 3 mA at 24 Volts DC
- Power Dissipation: 3.7 Watts with thermal dissipation of 12.6 BTU per hour
- Ethernet Port: One RJ45 Category 5 port with shielded or unshielded cable support
- Operating Temperature: 0 to 60 degrees Celsius
- Isolation Voltage: 30 Volts from Ethernet network to backplane
- Humidity: 5 to 95% relative humidity (non-condensing)
- Slot Width: 1 slot in ControlLogix chassis
- Packet Rate: Up to 5000 I/O packets/sec
Typical Applications
With 64 TCP and 128 CIP connections at 10/100 Mbps, the module supports processor interlocking, distributed I/O control, and routing to devices on different networks using Ethernet/IP as a backbone backbone, allowing users to control, configure, and collect data in one integrated network. This module is ideal for applications requiring:
- Gateway functionality between ControlLogix systems and EtherNet/IP devices
- Remote I/O distribution across Ethernet networks
- Inter-controller communication and data sharing
- HMI and SCADA system integration
- Distributed automation architectures with centralized control
Compatibility & Replacements
The 1756-ENBT is part of the standard ControlLogix catalog alongside related modules including the 1756-EN2F, 1756-EN2T, 1756-EN2TR, 1756-EN3TR, 1756-EWEB, and 1756-CN2 series. The 1756-ENBT/A variant is the current revision of this communication module. Agency certifications include UL Listed, CSA Certified, CE Marked for all applicable directives, and ATEX Certified for hazardous locations. This module is compatible with Studio 5000 and RSLogix 5000 programming environments for configuration and diagnostics.
