Allen-Bradley 1756-DHRIO ControlLogix – Ready to Ship / Pick Up

Name: Allen-Bradley 1756-DHRIO ControlLogix
Brand: Allen-Bradley
SKU: 1756-DHRIO
Price: 149.99 USD
Availability: InStock

In stock: 1756-DHRIO ControlLogix DH+ / Remote I/O module, Data Highway Plus / Remote I/O module, two channels configurable for DH+ messaging or as a Remote I/O scanner/adapter. NJT Automation has 1 unit available in Milwaukee, WI, ready to ship or available for local pickup. Includes a one-year full-function warranty.

Allen-Bradley 1756-DHRIO ControlLogix DH+ / Remote I/O module – front view

$149.99USD

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Part Number	1756-DHRIO
Description	ControlLogix DH+ / Remote I/O module. In stock in used condition, Series A.
Shipping	Ships today UPS Ground included \| Next-Day Air and Worldwide Shipping available at checkout
Pickup	Free local pickup at 2122 N Prospect Ave. Call ahead at (414) 331-5954.
Warranty	1-year full-function warranty provided by NJT Automation. Warranty details Included 1 year, full-function 2 years +15% of product price ($22.50) 3 years +25% of product price ($37.50) View full warranty policy
Returns	90-day free returns. View return policy
Exchange	Send us your defective 1756-DHRIO after your purchase for a 10% core credit ($15). We also purchase old or damaged parts outright.

Replacement Options for 1756-DHRIO

In stock and ready to ship today

Allen-Bradley 1756-DHRIO/A Used - Buy 1756-DHRIO/A replacement | NJT Automation

Allen-Bradley 1756-DHRIO/A Used - alternate view

Allen-Bradley 1756-DHRIO/A ControlLogix Communications Interface DH+/RIO

$149.99 USD

Condition: Used

Series A

1 in stock

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Availability

Similar Match Available

A similar unit is in stock and ready to ship once you confirm the condition you need.

Variants

Part NumberConditionSeriesQtyPrice

1756-DHRIO/AUsedSeries A1$149.99 USD

1756-DHRIORefurbishedSeries needed—Request Quote

Repairs

1756-DHRIO Mail-In Repair Service

Part Number Decoder

ControlLogix DH+ / Remote I/O module

1756DHRIO

Data Highway Plus / Remote I/O module, two channels configurable for DH+ messaging or as a Remote I/O scanner/adapter.

1756: BulletinControlLogix: Rockwell Automation's chassis-based control platform (controllers, I/O, communication modules, power supplies and chassis).
DHRIO: Module codeData Highway Plus / Remote I/O module, two channels configurable for DH+ messaging or as a Remote I/O scanner/adapter.

Decoded from the Rockwell Automation catalog-number structure. Series and firmware revision are printed on the product label, not encoded here.

Physical Data

Weight and DimensionsWeight0.62 lb (0.28 kg)H × W × D5.7 × 1.4 × 5.7 in. (145 × 35 × 145 mm)

Weight	0.28 kg (0.62 lb) Typical unit weight
Dimensions (H × W × D)	145 × 35 × 145 mm (5.7 × 1.4 × 5.7 in.) Single-slot module
Shipping Weight	0.81 kg (1.78 lb) Estimated: unit weight plus box and packing material; bills as 2 lb
Shipping Box (L × W × H)	12 × 12 × 8 in. (305 × 305 × 203 mm) Smallest standard box fitting the product with 3 in. cushioning per side

Product weight and dimensions are typical manufacturer-published values and may differ by series or option. Shipping box and weight are estimates for freight planning; the packed unit may ship in a different box.

Datasheet

Datasheet available for download

Generated from product specifications; not an official Allen-Bradley datasheet. For an official datasheet, contact Allen-Bradley or an authorized distributor.

Similar Part Numbers

1756-HIST2G Module code: FactoryTalk Historian Machine Edition module with 2 GB
1756-OF8I Module code: 8-channel isolated analog output module
1756-RM2 Module code: Redundancy module, second generation

Allen Bradley Information

Technical Description

Data Highway Plus / Remote I/O module, two channels configurable for DH+ messaging or as a Remote I/O scanner/adapter.

Technical Specifications8 parameters from manufacturer-published specifications

Module type	Data Highway Plus / Remote I/O communication interface
Channels	2, each configurable as DH+ or Remote I/O
Data rates	57.6, 115.2 or 230.4 kbps
Remote I/O capacity	32 logical racks and 16 block-transfer connections per RIO channel
Connections	32
Backplane current	850 mA @ 5.1V DC
Power dissipation	4.5 W
Chassis slots	1

Typical manufacturer-published values for this catalog number; confirm against the current manufacturer documentation before specifying.

Alternate Part Numbers

1756DHRIO, 1756 DHRI0

Can the 1756-DHRIO be repaired?

Yes. NJT Automation offers mail-in repair for the 1756-DHRIO, including diagnostic evaluation, component-level repair, and functional testing.

NJT Managed Repair

One vendor. One warranty. NJT manages the entire process.

1-year full-function NJT warranty, with 2- and 3-year options available
Rush service available for production-critical repairs
No evaluation or diagnostic charges
No repair, no charge
"Unrepairable" is not an option
Pre-paid UPS shipping label provided for sending your unit in
$650 minimum repair charge, shipping included both ways

Get an NJT Repair Quote

Looking for another option? For lower-cost repairs or if you prefer to work directly with an independent repair specialist, compare bids through RepairMode. RepairMode providers operate independently and set their own pricing and warranty terms.

Find a PLC repair specialiston RepairMode.com ↗

Common 1756-DHRIO failures

Failure patterns we regularly see on ControlLogix DH+ / Remote I/O module hardware like the 1756-DHRIO:

Channel driver failure: DH+ or RIO channel dead or intermittent with good cabling and termination
Blue-hose connector or channel LED faults after a lightning or ground-loop event
Rack-address / baud-rate rotary switch wear causing intermittent RIO adapter faults
Module will not bridge messages after an unfinished firmware update
Dead module after a chassis power event

Repair or replace?

ReplaceReplacement ControlLogix DH+ / Remote I/O module units are usually surplus. Swap the 1756-DHRIO when the network is down and a tested unit is available. Check that the series and firmware match the rest of the network. The 1756-DHRIO is on our shelf now and ships the same day for orders placed before 5:00 PM Central.

RepairRepair is often the better value on the 1756-DHRIO: legacy network hardware fails at the connectors, drivers and power section rather than the logic, and a repaired unit keeps a known-good module on an aging network without a compatibility risk. The two 1756-DHRIO symptoms we see most often are “Channel driver failure” and “Blue-hose connector or channel LED faults”. If a replacement is already installed, repairing the failed 1756-DHRIO gives you a tested spare on the shelf, which is worth more on an older platform where a matching unit can take time to source. Each 1756-DHRIO we repair goes back function-tested with a 1-year warranty.

Request a Repair Quote

Text photos of the faulty unit and the symptoms to (414) 331-5954.

Start Your Repair Today

Related services:PLC Repair All Repair Services

All product photos were taken by NJT Automation. Test videos originated from either NJT Automation internally or from repair technicians within our network.

Still have questions?

Find answers to shipping, warranties, repairs, and more.

Frequently Asked Questions

What is the 1756-DHRIO?

The Allen-Bradley 1756-DHRIO is a ControlLogix DH+ / Remote I/O module: Data Highway Plus / Remote I/O module, two channels configurable for DH+ messaging or as a Remote I/O scanner/adapter.

What condition is the 1756-DHRIO in?

NJT Automation currently has 1 unit of the 1756-DHRIO in stock in used condition (Series A). Each listing states its own condition and series. Clean used pull with full functionality. Minimal cosmetic wear and backed by our 1-year warranty.

How much does the 1756-DHRIO cost?

At NJT Automation, 5 1756-DHRIO ControlLogix DH+ / Remote I/O modules have sold since 2024 for $500 – $1,200, with a median of $950. Right now 1 unit is in stock at $150, depending on condition and series.

When does this part ship?

NJT Automation has 1 unit of the 1756-DHRIO ControlLogix DH+ / Remote I/O module on the shelf in Milwaukee, WI, priced from $149.99. Orders placed before 5:00 PM Central on business days ship the same day; orders placed after the cutoff ship the next business day.

Can you ship this next-day air?

Yes. UPS Next Day Air is available at checkout for the 1756-DHRIO ControlLogix DH+ / Remote I/O module. Place your order before 5:00 PM Central on a business day and your in-stock item ships the same day for next-business-day delivery.

Can I pick this item up locally?

Yes. Free local pickup is available for the 1 in-stock 1756-DHRIO unit at NJT Automation, 2122 N Prospect Ave, Milwaukee, WI, during business hours. Contact us to arrange a pickup time.