Allen-Bradley 1756-DNB ControlLogix DeviceNet Module

Allen-Bradley 1756-DNB ControlLogix DeviceNet scanner, DeviceNet scanner / bridge module: 125…500 kbps, acts as master (scanner) for DeviceNet devices. NJT Automation sources the 1756-DNB on request; send the part number for a replacement or repair quote.

Quote required. Request a quote below for pricing and delivery.

Allen-Bradley 1756-DNB ControlLogix DeviceNet scanner – front view

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Part Number	1756-DNB
Price	On Request Previously sold for $198.99 USDAvailability and condition determine final quote.
Description	ControlLogix DeviceNet scanner.
Shipping	UPS Ground included \| Next-Day Air and Worldwide Shipping available at checkout
Warranty	1-year full-function warranty provided by NJT Automation. Warranty details Included 1 year, full-function 2 years +15% of product price ($29.85) 3 years +25% of product price ($49.75) View full warranty policy
Returns	90-day free returns. View return policy
Exchange	Send us your defective 1756-DNB after your purchase for a 10% core credit. We also purchase old or damaged parts outright.

Availability

Available Level 1

This part is available through our Level 1 supplier network. Request a quote to confirm quantity, price, and next-day shipping options.

Inventory Level 1 RFQ

Level 1 parts come from vetted US suppliers we have worked with for years. Each unit is checked before it ships, so counterfeits, repackaged items sold as new, and worn-out equipment do not reach you. Every part carries the same NJT warranty and return policy as our own stock.

Request Quote Learn more about Inventory Levels

Repairs

1756-DNB Mail-In Repair Service

How the Process Works:

Submit Your RFQ: Complete the request-for-quote (RFQ) form with your exact requirements.
Receive a Quote: We respond ASAP - within 1 hour during business hours.
Approve and Pay: Agree to the quoted price, and we will issue an invoice payable via credit card or your preferred method.
Direct Shipping: Our normal shipping time is 3-5 business days, during which we thoroughly inspect and certify items to meet our high standards. If you request next-day air delivery, the item will be sent directly to you and arrive the following business day. Please note: These items are NOT available for local pickup at NJT Automation's location.

What We Offer

We source genuine parts from trusted U.S. channels and stand behind what we sell.

Our network has millions of parts ready to be delivered now.
Complete Transparency: Clear information on item availability.
Well-vetted components from trusted suppliers sourced from the USA.
Technical Support: Assistance, troubleshooting and hardware repairs.
Minimal Markup: The best sourcing service at a minimal cost.
Quick Delivery: Fast access to the parts you need to get your machines back up and running.
Dropship available • No branding on packaging

Part Number Decoder

ControlLogix DeviceNet scanner

1756DNB

DeviceNet scanner / bridge module: 125…500 kbps, acts as master (scanner) for DeviceNet devices.

1756: BulletinControlLogix: Rockwell Automation's chassis-based control platform (controllers, I/O, communication modules, power supplies and chassis).
DNB: Module codeDeviceNet scanner / bridge module: 125…500 kbps, acts as master (scanner) for DeviceNet devices.

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-DHRIO Module code: Data Highway Plus / Remote I/O module
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

DeviceNet scanner / bridge module: 125…500 kbps, acts as master (scanner) for DeviceNet devices.

Lifecycle: Discontinued. Verify current status with the manufacturer.

Alternate Part Numbers

1756DNB

Previously sold 1756-DNB

2 sold

NJT Automation has supplied and shipped 2 1756-DNB ControlLogix DeviceNet scanners in 2024; request a quote and we will source another from our supplier network.

Sold: 2 in 2024
Price: $199
By condition: Unused surplus (2)$199

Unused surplus 1756-DNB ControlLogix DeviceNet scanners have sold for $199.

Sold

2023 Allen Bradley 1756-DNB Ser E ControlLogix DeviceNet Comms Module - Sealed

$198.99 USD

Unused surplus (new old stock)

Request Quote

Sold

Allen Bradley 1756-DNB SER E ControlLogix DeviceNet Comms Module

$198.99 USD

Unused surplus (new old stock)

Request Quote

Can the 1756-DNB be repaired?

Yes. NJT Automation offers mail-in repair for the 1756-DNB, 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-DNB failures

Failure patterns we regularly see on ControlLogix DeviceNet scanner hardware like the 1756-DNB:

Bus-off (code 91) from a failed CAN transceiver, wrong baud or a shorted trunk line
Scanner shows code 78 / 72 for nodes that are actually healthy: scanner-side transceiver failure
No 24V network power detected (code 92) when the scanner's network input circuit has failed
Alphanumeric display dead or partially lit
Scanlist lost after module replacement (backplane / firmware mismatch)

Repair or replace?

ReplaceA ControlLogix DeviceNet scanner holds little more than a network address, so a replacement 1756-DNB drops in with almost no setup. Replace it when the network is down or the module is physically damaged. The 1756-DNB is not shelf stock, so sourcing time is part of the repair-or-replace decision.

RepairRepair makes sense on the 1756-DNB when the failure is a connector, port or power-section fault on an otherwise sound board, or when you have several failing modules and want them returned as tested spares. The two 1756-DNB symptoms we see most often are “Bus-off (code 91)” and “Scanner shows code 78 / 72 for nodes”. If a replacement is already installed, repairing the failed 1756-DNB gives you a tested spare on the shelf for the next failure. Repaired 1756-DNB units are function-tested before return and carry 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-DNB?

The Allen-Bradley 1756-DNB is a ControlLogix DeviceNet scanner: DeviceNet scanner / bridge module: 125…500 kbps, acts as master (scanner) for DeviceNet devices.

What condition is the 1756-DNB in?

The 1756-DNB is available in Used condition. Clean used pull with full functionality. Minimal cosmetic wear and backed by our 1-year warranty.

How much does the 1756-DNB cost?

At NJT Automation, 2 1756-DNB ControlLogix DeviceNet scanners have sold in 2024 for $199. None are in stock at the moment; request a quote for current pricing.

When does this part ship?

This 1756-DNB is sourced on request, so sourcing and quote timelines apply. Request a quote and we'll confirm availability and lead time. Many parts can be sourced within a few business days through our Level 1 supplier network.

Can you ship this next-day air?

Yes. UPS Next Day Air is available at checkout for the 1756-DNB ControlLogix DeviceNet scanner. 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. Once your 1756-DNB has been sourced and is ready, free local pickup is available at NJT Automation, 2122 N Prospect Ave, Milwaukee, WI, during business hours.