Allen Bradley AB ControlLogix DH+/RIO Communication Interface 1756-DHRIO /B

The Allen-Bradley 1756-DHRIO/B is a Data Highway Plus (DH+) and Remote I/O (RIO) communication interface module designed for the ControlLogix platform. This module facilitates seamless integration between modern ControlLogix systems and legacy Allen-Bradley devices operating on DH+ or RIO networks.

Key Features

• Dual Communication Channels: Equipped with two independent channels, each configurable for either DH+ or RIO communication, providing flexibility in network integration.
• Versatile Data Rates: Supports communication speeds of 57.6 Kbaud, 115.2 Kbaud, and 230.4 Kbaud, accommodating various network requirements.
• Extended Cable Lengths: Capable of supporting cable lengths up to 3,048 meters (10,000 feet) at 57.6 Kbaud, ensuring reliable communication over long distances.
• Robust Integration: Facilitates data exchange between ControlLogix processors and remote I/O chassis, drives, or other DH+ enabled devices, enabling efficient system integration.

Technical Specifications

• Communication Protocols: Data Highway Plus (DH+) and Remote I/O (RIO).
• Number of Channels: 2 independent channels.
• Communication Speeds:
  • 57.6 Kbaud
  • 115.2 Kbaud
  • 230.4 Kbaud
• Supported Cable Lengths:
  • Up to 3,048 meters (10,000 feet) at 57.6 Kbaud
  • Up to 1,524 meters (5,000 feet) at 115.2 Kbaud
  • Up to 762 meters (2,500 feet) at 230.4 Kbaud
• Recommended Cable: Belden 89463 twinaxial, 0.52 mm² (20 AWG), rated at 200°C (392°F).
• Backplane Current:
  • 1.7 mA at 5V DC
  • 850 mA at 24V DC
• Power Dissipation: 4.5 Watts maximum.
• Thermal Dissipation: 15.4 BTU per hour maximum.
• Operating Temperature: 0°C to 60°C (32°F to 140°F).
• Storage Temperature: -40°C to 85°C (-40°F to 185°F).
• Relative Humidity: 5% to 95% non-condensing.
• Module Slot Width: 1 slot.
• Weight: Approximately 0.64 pounds (0.293 kilograms).

Installation and Configuration

The 1756-DHRIO/B module is designed for easy installation within any slot of a 1756 ControlLogix chassis. Prior to installation, ensure that the network type switches for each channel are appropriately programmed. The module supports installation and removal under power, but it is crucial to observe safety precautions to prevent electrical arcing and potential damage. For optimal performance, use the recommended Belden 89463 twinaxial cable and appropriate terminating resistors based on the selected communication speed.

Applications

This module is ideal for industrial environments requiring integration between modern ControlLogix systems and existing legacy devices on DH+ or RIO networks. It enables cost-effective system upgrades by allowing phased modernization without the need for complete hardware replacement. The 1756-DHRIO/B supports various communication functions, including Remote I/O, Control and Information Protocol (CIP) Messaging, and Data Highway Plus (DH+) Messaging, facilitating efficient data exchange across diverse network configurations.