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      Allen-Bradley 1756-DHRIO
      Allen-Bradley 1756-DHRIO

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      ControlLogix DH+/Remote I/O Communication Module

      1756-DHRIO

      Spare Part Number

      PN1756-DHRIO

      Product Information:

      Allen-Bradley 1756-DHRIO is a one-slot ControlLogix communication module for Data Highway Plus and Remote I/O networks.

      Its two independently selectable channels support 57.6, 115.2 or 230.4 Kbit/s operation, up to 32 connections and Remote I/O scanner functions.

      The module draws 850 mA at 5.1 V DC, dissipates 4.5 W and requires compatible ControlLogix chassis, power supply, cabling and network configuration.

      Product image is representative; revision or series may vary. Contact us to request a specific version.
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      • One-year warranty
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      Technical specifications for

      1756-DHRIO

      0 TECHNICAL PARAMETERS
      • Manufacturer:
        Allen-Bradley
      • Product Category:
        PLC and Machine Control
      • Spare Part Number:
        1756-DHRIO
      • Estimated shipping dimensions:
        17.5 x 14.5 x 3.6 cm
      • Weight:
        0.68 kg
      • Tariff Code:
        851762
      • Country of origin:
        USA
      • Place of shipment:
        Xiamen, Fujian, China
      • Network types:
        Data Highway Plus; Remote I/O
      • Communication channels:
        2 independently selectable
      • Communication rates:
        57.6; 115.2; 230.4 Kbit/s
      • Maximum connections:
        32
      • Remote I/O racks:
        32 logical rack connections per channel
      • Block transfers:
        16 connections per channel
      • Current draw at 5.1 V DC:
        850 mA
      • Current draw at 24 V DC:
        1.7 mA
      • Power dissipation:
        4.5 W
      • Slot width:
        1
      • Operating temperature:
        0 to 60 °C
      • Storage temperature:
        -40 to +85 °C
      • Stock Availability:
        61
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      BUYER INFORMATION

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      Commercial details are confirmed in writing before payment.
      • 01

        Factory Sealed

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      • 03

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        New and current product sourced through the manufacturer or authorized supply channel when expressly confirmed in the quotation.

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      Revisions

      Revision Part #

      Also known as

      1756-DHRIO/A
      1756-DHRIO Ser A, Series A, Rev A
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      1756-DHRIO/B
      1756-DHRIO Ser B, Series B, Rev B
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      1756-DHRIO/C
      1756-DHRIO Ser C, Series C, Rev C
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      1756-DHRIO/D
      1756-DHRIO Ser D, Series D, Rev D
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      1756-DHRIO/E
      1756-DHRIO Ser E, Series E, Rev E
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      Alternative Names

      1756-DHRIO 1756-DHRIOK 1756-DHRIOXT

      Information

      Overview Manuals Network Roles Channel Configuration Migration Guidance

      Features:

      • Two channels individually selectable for DH+ or Remote I/O
      • 57.6, 115.2 or 230.4 Kbps communication rate
      • Remote I/O scanner with 32 logical rack connections per channel
      • Single-slot ControlLogix chassis module

      The Allen-Bradley 1756-DHRIO bridges legacy Data Highway Plus and Remote I/O networks into a ControlLogix chassis. DH+ channels support controller and programming messages, while Remote I/O mode allows the module to scan digital and block-transfer data from compatible remote devices.

      Both communication ports are configured individually for the required network role and rate. A correct replacement must preserve channel mode, rack addressing, baud rate, cabling and message paths as well as the ControlLogix chassis configuration.

      The Allen-Bradley 1756-DHRIO is discontinued by Rockwell Automation; EtherNet/IP modernization using a module such as 1756-EN2TR requires an engineered migration plan.
      Allen-Bradley 1756-DHRIO ControlLogix DH+ and Remote I/O Module Manuals(Datasheets), Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

      Network Roles:

      • Data Highway Plus messaging
      • Remote I/O scanner operation
      • Two independently configurable channels
      • Legacy controller and operator-interface integration

      Use the module when an installed ControlLogix system must maintain communications with supported DH+ or Remote I/O equipment.

      Channel Configuration:

      • 57.6 Kbps
      • 115.2 Kbps
      • 230.4 Kbps
      • Belden 9463 twinaxial media

      Channel A and Channel B settings must match the physical network, node addressing and existing controller message paths.

      Migration Guidance:

      • Document both channel configurations
      • Archive controller and message logic
      • Identify all remote racks and block transfers
      • Validate replacement network architecture

      Because modern EtherNet/IP modules do not directly reproduce DH+ or Remote I/O functions, convert the network only through a controlled application-specific migration.

      Technical notes

      Allen-Bradley 1756-DHRIO is a ControlLogix DH+/Remote I/O Communication Module in the ControlLogix 1756 family. Its two independently selectable channels support 57.6, 115.2 or 230.4 Kbit/s operation, up to 32 connections and Remote I/O scanner functions. Confirm the complete catalog number, compatible system hardware, wiring, environmental limits and lifecycle status against the manufacturer documentation before installation.
      PRODUCT & ORDER FAQS

      Questions buyers ask about 1756-DHRIO

      • How can I identify 1756-DHRIO?

        Verify the complete catalog number 1756-DHRIO on the product label and compare the documented two selectable DH+ or Remote I/O channels before installation.

      • What is 1756-DHRIO compatible with?

        It installs in a ControlLogix 1756 chassis and each of its two ports can be selected for Data Highway Plus or Remote I/O operation.

      • Where is 1756-DHRIO typically used?

        It bridges ControlLogix systems to legacy DH+ messaging and Remote I/O scanner networks.

      • What should be checked before installation?

        Confirm the mounting, wiring, supply, environmental limits and system firmware stated in the official documentation for 1756-DHRIO.

      • Is 1756-DHRIO available from stock?

        Stock is confirmed at the time of quotation. Moore Automated can check the exact 1756-DHRIO revision and configuration before shipment.

      • What warranty is provided?

        Warranty terms are confirmed with the quotation and apply to the supplied 1756-DHRIO hardware after inspection and functional verification.

      • How is 1756-DHRIO shipped?

        The unit is securely packed and dispatched from Xiamen, Fujian, China, with fast shipment available and an estimated processing time of 3 days.
      All FAQ
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          WHY BUYERS WORK WITH MOORE AUTOMATED

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          • Pre-shipment inspection

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          • Documentation available

            Product photos, packaging photos, certificates and datasheets can be provided when available.

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          • 20+ years of experience

            Over 20 years of experience in industrial automation and hard-to-source legacy parts.

          • Product Lifecycle Stage

            Obsolete/Discontinued by OEM

            Rockwell Automation identifies this module as discontinued; migration uses a supported ControlLogix EtherNet/IP communication module such as 1756-EN2TR together with an engineered legacy-network conversion strategy rather than a drop-in replacement.

            Moore Automated supplies high-quality Allen-Bradley 1756-DHRIO replacement modules and spare parts for verified industrial maintenance requirements.

            Our controlled sourcing and replacement solutions help users restore compatible hardware efficiently and reduce unplanned downtime.

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          Moore Disclaimer: Moore Automated's sales automation equipment and related solutions are intended for industrial automation and business operational efficiency improvement purposes only. Product information, technical parameters, and application cases are for reference only and do not constitute an absolute guarantee of performance for any specific industry, scenario, or final application. Actual equipment performance may vary depending on factors such as the usage environment, system integration method, and maintenance conditions. Users should confirm compatibility and safety based on professional technical assessments. Moore Automated assumes no liability for any direct or indirect losses caused by improper use, modification, or failure to operate according to specifications, to the extent permitted by law.

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