Description

Brief Product Description

The Allen-Bradley 1756-CN2R is a high-capacity ControlNet bridge module designed for the ControlLogix platform, providing redundant media connectivity for mission-critical industrial networks. This module facilitates deterministic, high-speed data transfers between controllers and I/O devices across complex automation architectures.

Product Description

Deterministic Network Communication and Redundancy

The Allen-Bradley 1756-CN2R functions as a high-performance communication bridge within the ControlLogix ecosystem. By utilizing the ControlNet protocol, this module enables deterministic, repeatable data exchanges that are essential for time-critical control applications. The “R” designation signifies its redundant media capability, which allows the module to maintain a continuous connection even if one cable path fails. Consequently, this dual-channel architecture prevents network downtime and ensures that the PLC maintains constant oversight of distributed I/O and remote racks.

Enhanced Connection Capacity for Large-Scale Systems

Engineered to support extensive automation networks, the 1756-CN2R significantly outperforms standard interface cards in connection density. It effectively manages up to 128 Logix connections and supports a maximum of 99 nodes per network. This increased capacity allows system architects to consolidate communication hardware while maintaining high-speed throughput of 5 Mbps. Because the module handles both scheduled and unscheduled traffic, it can simultaneously manage high-priority control data and general messaging without performance degradation.

Industrial Reliability and Seamless Integration

The 1756-CN2R integrates directly into any standard ControlLogix chassis, drawing power from the backplane and requiring no external power supply. Its ruggedized design specifically targets harsh manufacturing environments, where electromagnetic interference and vibration are common challenges. Furthermore, the module supports easy configuration through Studio 5000 Logix Designer software, simplifying the setup of redundant media paths and node addressing. This reliability makes the 1756-CN2R a foundational component for industries prioritizing process safety and maximum equipment uptime.

Technical Specifications