Allen-Bradley 1756-DHRIO | ControlLogix DH Remote I/O Module

Overview

The Allen-Bradley 1756-DHRIO is a high-performance ControlLogix communication module. It supports both Data Highway Plus (DH+) and Remote I/O (RIO) protocols, enabling seamless connectivity across multiple PLC networks.

This module features dual communication channels. Channels A and B include 3-pin terminals for DH+ or RIO wiring. Channel A also offers a parallel 8-pin mini-DIN port, enhancing flexibility in system connections.

With a communication speed range of 57.6 Kbaud to 230.4 Kbaud, the 1756-DHRIO supports cable lengths up to 3048 meters, accommodating complex network topologies in industrial environments.

Compact and efficient, this module occupies a single slot in the 1756 ControlLogix chassis and weighs only 0.64 lbs (0.293 kg), ensuring easy installation and minimal space usage.

Key Features

• Brand: Allen-Bradley / Rockwell Automation

• Model: 1756-DHRIO

• Product Type: ControlLogix DH+/Remote I/O Module

• Channels: 2 (Channel A & B)

• Ports: 3-pin terminals for DH+/RIO, 8-pin mini-DIN on Channel A

• Communication Speeds: 57.6 Kbaud, 115.2 Kbaud, 230.4 Kbaud

• Maximum Cable Length: 3048 m (10000 ft)

• Backplane Current: 5V 1.7 mA, 24V 850 mA

• Power Dissipation: 4.5 W

• Thermal Dissipation: 15.4 BTU/hr

• Slot Width: 1

• Enclosure: Open

• Weight: 0.64 lbs (0.293 kg)

• Operating Temperature: 0–60 °C (32–140 °F)

• Recommended Cable: Belden 89463 twinaxial, 0.52 mm², 200 °C rating

Technical Specifications

Advantages

• Supports dual-channel communication for DH+ and Remote I/O networks.

• Parallel 8-pin mini-DIN enhances connection flexibility.

• Operates over long cable distances up to 3048 m for complex setups.

• Single-slot design saves space in ControlLogix racks.

• Efficient energy usage with low power and thermal dissipation.

FAQ

Q1: Is the Allen-Bradley 1756-DHRIO brand new?
A1: Yes, it is factory new and available in stock.

Q2: How many communication channels does this module support?
A2: It has 2 channels: Channel A and Channel B.

Q3: What communication speeds are available?
A3: The module operates at 57.6 Kbaud, 115.2 Kbaud, and 230.4 Kbaud.

Q4: What is the maximum cable length supported?
A4: It supports up to 3048 meters (10000 ft) depending on network configuration.

Q5: How much space does it occupy in the chassis?
A5: The 1756-DHRIO occupies a single slot in the 1756 ControlLogix chassis.

Q6: What ports are available for connections?
A6: Two 3-pin terminals for DH+/RIO, and an 8-pin mini-DIN port parallel to Channel A.