Description

Product Overview

The Allen-Bradley 1756-ENBT is a high-performance EtherNet/IP bridge module engineered for the ControlLogix® automation platform. It serves as a vital network gateway, translating the ControlLogix backplane signals into standard Ethernet protocols to enable high-speed, real-time data exchange across modern industrial control systems.

By acting as a communications bridge, the 1756-ENBT allows ControlLogix controllers to interface seamlessly with Human-Machine Interfaces (HMIs), supervisory SCADA networks, distributed I/O blocks, and other programmable automation controllers. This makes it an essential link for industrial internet connectivity, plant-wide asset optimization, and enterprise-level resource data collection.

Advanced Capabilities and Functional Benefits

• High-Capacity Logix Bridging: Manages up to 128 simultaneous Common Industrial Protocol (CIP) connections, enabling heavy concurrent messaging between multiple plant controllers and software networks.
• CIP Safety Routing Support: Functions as a trusted communication highway alongside GuardLogix® safety controllers, safely bridging critical safety-interlock data across different facility zones without sacrificing SIL3/PLe verification ratings.
• Deterministic I/O Control: Supports up to 64 explicit TCP/IP messaging connections, providing the deterministic, microsecond timing required to reliably command remote field I/O tracks and variable frequency drives.
• Simplified Hardware Maintenance: Supports complete removal and insertion under power (RIUP), allowing field technicians to replace the module in active chassis racks without interrupting adjacent processor execution or dropping system power.
• Built-In Diagnostic Display: Features an integrated scrolling alphanumeric LED status display on the front panel to provide immediate hardware health checks, active IP addresses, and link fault diagnostics at a glance.

Technical Specifications

Network & Communication Performance

• Module Type: EtherNet/IP Communications Bridge
• Data Transfer Rates: 10/100 Mbps (Auto-negotiating or fixed hardware speed selection)
• Maximum Net CIP Connections: 128
• Maximum TCP/IP Connections: 64
• Network Topology Configurations: Star, Tree, or Linear daisy-chained routing
• Communication Interface: 1 RJ45 Ethernet Port (Standard Category 5e/6 unshielded twisted-pair cabling)

Electrical & Physical Properties

• Chassis Slot Requirement: Requires 1 single slot within any standard 1756 ControlLogix chassis
• Backplane Current Demands: 700 mA @ 5.1 V DC | 0 mA @ 24 V DC
• Maximum Power Dissipation: 3.7 W
• Enclosure Footprint Dimensions: 5.7 cm (W) x 10.5 cm (H) x 13.0 cm (D)
• Net Hardware Weight: 0.20 kg (approx. 200 grams)
• Country of Origin: United States (USA)
• Product Lifecycle Classification: Active (Widely supported legacy standard)

Industrial Applications

• Automotive Assembly Network Routing: Connecting primary assembly-line GuardLogix processors with remote weld controllers and robotic arms via localized CIP Safety links.
• Water Treatment Plant Scada Interfacing: Relaying distributed tank level and chemical sensor telemetry data across wide physical layouts to central HMI monitoring rooms.
• Food & Beverage Batch Management: Synchronizing recipe parameter databases from corporate Manufacturing Execution Systems (MES) down into specific batch-mixing controller registers.
• Packaging Machinery Line Integration: Interfacing interlocking line machinery to coordinate conveyor speeds and product packaging transitions seamlessly without physical hardwiring.