Description

The Allen-Bradley 1756-DHRIO is a ControlLogix communication interface module designed to provide connectivity between ControlLogix controllers and Data Highway Plus (DH+) networks or Remote I/O (RIO) networks. This module functions as a bridge, allowing for seamless data exchange and device management across legacy and modern industrial communication architectures.

Features

• Dual-channel communication interface for versatile network integration.
• Supports Data Highway Plus (DH+) communication protocol.
• Functions as a Remote I/O (RIO) scanner for distributed control applications.
• Selectable communication speeds: 57.6 Kbaud, 115.2 Kbaud, and 230.4 Kbaud.
• Designed for seamless integration into the ControlLogix chassis backplane.

Applications

The 1756-DHRIO is typically utilized in industrial automation environments requiring the integration of legacy DH+ networks or RIO-based field devices into a modern ControlLogix platform. It is commonly found in manufacturing, process control, and material handling systems where legacy infrastructure must be maintained alongside newer control hardware.

Technical Specifications

Installation Guidelines

• Ensure the ControlLogix chassis power is disconnected before installing or removing the module.
• Slide the module into the designated chassis slot and secure it using the top and bottom latching mechanisms.
• Use shielded twinaxial cable (e.g., Belden 89463) for all DH+ and RIO connections to minimize EMI interference.
• Maintain proper grounding practices for the communication shield to prevent noise-related communication errors.
• Verify that the baud rate settings on the module match the existing network configuration before commissioning.

FAQ

What is the primary function of the 1756-DHRIO module?

The module acts as a communication bridge, enabling a ControlLogix controller to communicate with devices on a Data Highway Plus network or to act as a scanner for Remote I/O networks.

Can this module be used for both DH+ and RIO networks?

Yes, the 1756-DHRIO is designed to support both DH+ and Remote I/O communication protocols, providing flexibility for legacy system integration.