Allen Bradley 1756-DHRIO Communication Module

The Allen Bradley 1756-DHRIO acts as a high-performance communication bridge for ControlLogix systems. This module enables seamless data exchange between modern controllers and legacy architectures. It specifically supports Data Highway Plus (DH+) and Remote I/O (RIO) protocols. Two independent channels provide dedicated ports for concurrent network operations.

Engineers use this module to migrate older systems to newer platforms. It allows a ControlLogix processor to control existing I/O racks. Furthermore, it facilitates messaging between PLC-5 or SLC 500 controllers. The hardware manages complex timing requirements for industrial data traffic. This ensures high reliability during critical automation tasks.

Technical Performance and Connectivity

The 1756-DHRIO module offers adjustable communication speeds to match specific network needs. Users can select baud rates of 57.6, 115.2, or 230.4 Kbaud. Higher speeds optimize data throughput for intensive applications. Lower speeds extend the maximum cable distance up to 3048 meters.

Power efficiency remains a priority for high-density chassis configurations. The module consumes 1.2 Amps at 5.1V DC from the backplane. It also draws 3.5 mA at 24V DC for operation. Total power dissipation stays below 6.2 Watts to minimize heat buildup. The unit fits into any slot of a standard ControlLogix chassis.

Primary Industrial Applications

• Gradual migration of PLC-5 and SLC 500 systems
• Centralized data collection from legacy Remote I/O stations
• Peer-to-peer messaging across distributed industrial networks
• Interface for HMI and SCADA systems on DH+ links
• Remote programming and maintenance of older controllers

Product Specifications