Allen-Bradley

Allen-Bradley 1756-DHRIO ControlLogix DH Plus and RIO Communications Module

SKU 1756-DHRIO

In stock
  • 12-month warranty
  • Free returns within 30 days
  • Manufacturer: Allen-Bradley
  • Product No.: 1756-DHRIO
  • Origin United States
  • Product Type: Communications Module
  • Payment: T/T, Western Union
  • Weight: 0.38 kg
  • Dimensions: 14.5 x 11.8 x 3.2 cm
  • Shipping port: Xiamen
  • Warranty: 12 months

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Product Documentation

Technical Datasheet (PDF) Complete specifications and technical drawings.

Technical Datasheet

Allen-Bradley 1756-DHRIO ControlLogix DH Plus and RIO Communications Module

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Product Description

Description

The Allen-Bradley 1756-DHRIO is a high-performance ControlLogix communication module designed to bridge data across Data Highway Plus (DH+) and Remote I/O (RIO) networks. As part of the Rockwell Automation ControlLogix platform, this module facilitates seamless information exchange and messaging between legacy controllers like PLC-5 and SLC 500 systems and modern ControlLogix architecture.

Equipped with dual independent communication channels, the 1756-DHRIO module can act as a bridge across multiple chassis and networks without requiring a controller in every local rack. It supports baud rates of 57.6 Kbps, 115.2 Kbps, and 230.4 Kbps on its RIO links, offering robust connectivity for complex industrial automation infrastructures.

Features

  • Dual-channel configuration supporting both Data Highway Plus (DH+) and Remote I/O (RIO) protocols.
  • Supports up to 32 DH+ messages per channel and 32 logical rack connections per remote I/O channel.
  • Selectable communication speeds of 57.6 Kbps, 115.2 Kbps, and 230.4 Kbps.
  • Backplane compatibility with standard ControlLogix chassis for seamless data routing.
  • DIN rail or direct backpanel mounting capability within the 1756 system ecosystem.

Applications

  • Bridging legacy PLC-5 and SLC 500 networks with modern ControlLogix PAC systems.
  • Distributed industrial control systems requiring remote I/O rack scanning and block-transfer communication.
  • Plant-wide cell-level data sharing and system integration.
  • SCADA and supervisory control network expansion.

Technical Specifications

Parameter Specification
Manufacturer Allen-Bradley / Rockwell Automation
Exact Model 1756-DHRIO
Product Type Communications Module
Platform ControlLogix (1756 Series)
Communication Protocols Data Highway Plus (DH+), Remote I/O (RIO)
Baud Rates (DH+) 57.6 Kbps
Baud Rates (RIO) 57.6 Kbps, 115.2 Kbps, 230.4 Kbps
Backplane Current Draw 1.7 mA at 5V DC, 850 mA at 24V DC
Power Dissipation 4.5 W max
Thermal Dissipation 15.4 BTU/hr max
Recommended Cable Belden 89463 twinaxial
Country of Origin United States

Connections / Interfaces

  • Two 3-pin phoenix-style removable screw terminal plugs for DH+ and RIO network connections.
  • ControlLogix backplane interface connector for direct insertion into any slot of a 1756 chassis.

Installation Guidelines

Ensure the ControlLogix chassis power supply is turned off before installing or removing the 1756-DHRIO module. Set the network type and node address switches prior to mounting the module into the chassis. Connect the Belden 89463 twinaxial cable to the appropriate channel terminals, ensuring proper termination resistors are installed at the first and last physical nodes of the daisy-chain network.

Compliance and Certifications

  • UL Listed Industrial Control Equipment
  • CE Compliant for EMC Directive
  • C-Tick Certified
  • hazardous location approvals (Class I, Division 2)
Shipping & Returns

Global Express Shipping

  • Standard Delivery: 4–6 business days via DHL, FedEx, and UPS.
  • Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
  • Worldwide Coverage: Serving over 150 countries.

Returns & Warranty

  • 30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
  • 12-Month Warranty: Every industrial component is backed by our technical warranty.
FAQ
What networks does the Allen-Bradley 1756-DHRIO support?
The 1756-DHRIO module supports Data Highway Plus (DH+) and Remote I/O (RIO) communication networks.
Does the 1756-DHRIO require a controller in the same chassis?
No, the module can operate in a chassis without a ControlLogix controller, acting as a bridge across networks.
What cable type is recommended for the 1756-DHRIO module?
Belden 89463 twinaxial cable is recommended for wiring the DH+ and Remote I/O communication channels.
What are the supported communication speeds?
The module supports 57.6 Kbps for DH+, and 57.6 Kbps, 115.2 Kbps, and 230.4 Kbps for Remote I/O connections.
How is power supplied to the 1756-DHRIO module?
Power is drawn directly from the ControlLogix chassis backplane (1.7 mA at 5V DC and 850 mA at 24V DC).
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1756-DHRIO

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Allen-Bradley 1756-DHRIO ControlLogix DH Plus and RIO Communications Module

Only 19 item(s) left in stock
  • Manufacturer: Allen-Bradley

  • Product No.: 1756-DHRIO

  • Country of origin:United States

  • Product Type: Communications Module

  • Payment: T/T, Western Union

  • Weight: 380g

  • Dimensions: 14.5 x 11.8 x 3.2 cm

  • Shipping port: Xiamen

  • Warranty: 12 months

Quantity
View full details

Product Description

Description

The Allen-Bradley 1756-DHRIO is a high-performance ControlLogix communication module designed to bridge data across Data Highway Plus (DH+) and Remote I/O (RIO) networks. As part of the Rockwell Automation ControlLogix platform, this module facilitates seamless information exchange and messaging between legacy controllers like PLC-5 and SLC 500 systems and modern ControlLogix architecture.

Equipped with dual independent communication channels, the 1756-DHRIO module can act as a bridge across multiple chassis and networks without requiring a controller in every local rack. It supports baud rates of 57.6 Kbps, 115.2 Kbps, and 230.4 Kbps on its RIO links, offering robust connectivity for complex industrial automation infrastructures.

Features

  • Dual-channel configuration supporting both Data Highway Plus (DH+) and Remote I/O (RIO) protocols.
  • Supports up to 32 DH+ messages per channel and 32 logical rack connections per remote I/O channel.
  • Selectable communication speeds of 57.6 Kbps, 115.2 Kbps, and 230.4 Kbps.
  • Backplane compatibility with standard ControlLogix chassis for seamless data routing.
  • DIN rail or direct backpanel mounting capability within the 1756 system ecosystem.

Applications

  • Bridging legacy PLC-5 and SLC 500 networks with modern ControlLogix PAC systems.
  • Distributed industrial control systems requiring remote I/O rack scanning and block-transfer communication.
  • Plant-wide cell-level data sharing and system integration.
  • SCADA and supervisory control network expansion.

Technical Specifications

Parameter Specification
Manufacturer Allen-Bradley / Rockwell Automation
Exact Model 1756-DHRIO
Product Type Communications Module
Platform ControlLogix (1756 Series)
Communication Protocols Data Highway Plus (DH+), Remote I/O (RIO)
Baud Rates (DH+) 57.6 Kbps
Baud Rates (RIO) 57.6 Kbps, 115.2 Kbps, 230.4 Kbps
Backplane Current Draw 1.7 mA at 5V DC, 850 mA at 24V DC
Power Dissipation 4.5 W max
Thermal Dissipation 15.4 BTU/hr max
Recommended Cable Belden 89463 twinaxial
Country of Origin United States

Connections / Interfaces

  • Two 3-pin phoenix-style removable screw terminal plugs for DH+ and RIO network connections.
  • ControlLogix backplane interface connector for direct insertion into any slot of a 1756 chassis.

Installation Guidelines

Ensure the ControlLogix chassis power supply is turned off before installing or removing the 1756-DHRIO module. Set the network type and node address switches prior to mounting the module into the chassis. Connect the Belden 89463 twinaxial cable to the appropriate channel terminals, ensuring proper termination resistors are installed at the first and last physical nodes of the daisy-chain network.

Compliance and Certifications

  • UL Listed Industrial Control Equipment
  • CE Compliant for EMC Directive
  • C-Tick Certified
  • hazardous location approvals (Class I, Division 2)
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Product Documentation

Technical Datasheet (PDF) Complete specifications and technical drawings.

Technical Datasheet

Allen-Bradley 1756-DHRIO ControlLogix DH Plus and RIO Communications Module

What networks does the Allen-Bradley 1756-DHRIO support?

The 1756-DHRIO module supports Data Highway Plus (DH+) and Remote I/O (RIO) communication networks.

Does the 1756-DHRIO require a controller in the same chassis?

No, the module can operate in a chassis without a ControlLogix controller, acting as a bridge across networks.

What cable type is recommended for the 1756-DHRIO module?

Belden 89463 twinaxial cable is recommended for wiring the DH+ and Remote I/O communication channels.

What are the supported communication speeds?

The module supports 57.6 Kbps for DH+, and 57.6 Kbps, 115.2 Kbps, and 230.4 Kbps for Remote I/O connections.

How is power supplied to the 1756-DHRIO module?

Power is drawn directly from the ControlLogix chassis backplane (1.7 mA at 5V DC and 850 mA at 24V DC).

Global Express Shipping

  • Standard Delivery: 4-6 Business Days via DHL, FedEx, and UPS.
  • Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
  • Worldwide Coverage: Serving over 150 countries, including rapid delivery to Saudi Arabia and UAE.

Returns & Warranty

  • 30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
  • 12-Month Warranty: Every industrial component is backed by our professional technical warranty.

Orders are processed and delivered Monday-Friday (excluding public holidays).


For full eligibility, restocking fees, and international return details, please view our official Refund & Return Policy .

TECHNICAL SPECIFICATIONS

Country of origin
United States

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