Allen-Bradley 1769-L23E-QBFC1B CompactLogix Processor 512 KB

Allen-Bradley 1769-L23E-QBFC1B CompactLogix L23E controller, 512 KB user memory, EtherNet/IP port plus RS-232 port, 2 Compact I/O expansion modules, embedded digital. NJT Automation sources the 1769-L23E-QBFC1B on request; send the part number for a replacement or repair quote.

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

Allen-Bradley 1769-L23E-QBFC1B CompactLogix controller, 512 KB – front view

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Part Number	1769-L23E-QBFC1B
Price	On Request Previously sold for $449.99 USDAvailability and condition determine final quote.
Description	CompactLogix controller, 512 KB.
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 ($67.50) 3 years +25% of product price ($112.50) View full warranty policy
Returns	90-day free returns. View return policy
Exchange	Send us your defective 1769-L23E-QBFC1B 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.

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Repairs

1769-L23E-QBFC1B 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

CompactLogix controller

1769L23EEQBFC1B

CompactLogix L23E controller, 512 KB user memory, EtherNet/IP port plus RS-232 port, 2 Compact I/O expansion modules, embedded digital, analog and counter I/O.

1769: BulletinCompactLogix / Compact I/O: Rockwell Automation's rack-less, DIN-rail Logix platform. 1769 controllers, I/O modules, power supplies and adapters snap together on a shared backplane bus.
L23E: ControllerCompactLogix L23E controller (first-generation CompactLogix, CompactFlash memory card).
512 KB: Memory size512 KB of user memory.
E: CommunicationEtherNet/IP port plus RS-232 port; 2 Compact I/O expansion modules.
QBFC1B: Embedded I/O16 sink/source 24V DC digital inputs, 16 sourcing 24V DC digital outputs, 4 universal analog inputs, 2 analog outputs and 4 high-speed counters built into the controller.

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 DimensionsWeight2.69 lb (1.22 kg)

Weight	1.22 kg (2.69 lb) Typical unit weight, packaged controller with embedded I/O; 1769-L23E-QB1B 0.91 kg
Shipping Weight	1.94 kg (4.28 lb) Estimated: unit weight plus box and packing material; bills as 5 lb
Shipping Box (L × W × H)	14 × 12 × 10 in. (356 × 305 × 254 mm) Most common box recorded for this catalog number

Product weight 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

1769-L23E-QB1B Embedded I/O: 16 sink/source 24V DC digital inputs and 16 sourcing 24V DC

Allen Bradley Information

Lifecycle: Discontinued. Verify current status with the manufacturer.

Alternate Part Numbers

1769L23EQBFC1B

Previously sold 1769-L23E-QBFC1B

1 sold

NJT Automation has supplied and shipped one 1769-L23E-QBFC1B CompactLogix controller in 2024; request a quote and we will source another from our supplier network.

Sold: 1 in 2024
Price: $450

The one 1769-L23E-QBFC1B CompactLogix controller sold in 2024 was used and went for $450.

Sold

Allen-Bradley 1769-L23E-QBFC1B SER. B LOGIX 5323E Controller Unit

$449.99 USD

Used

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Can the 1769-L23E-QBFC1B be repaired?

Yes. NJT Automation offers mail-in repair for the 1769-L23E-QBFC1B, 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 1769-L23E-QBFC1B failures

Failure patterns we regularly see on CompactLogix controller hardware like the 1769-L23E-QBFC1B:

Embedded Ethernet port failure or dropped connections on -E / -ER controllers
CompactFlash or SD card corruption: stored project will not load
Channel 0 RS-232 port damaged by a hot-plugged programming cable
1769 bus faults from a worn local-bus connector or a missing end cap
Program lost on power cycle: battery (1769-BA) depleted, BAT LED red or flashing

Repair or replace?

ReplaceReplacement CompactLogix controller units are usually surplus or refurbished. Replace the 1769-L23E-QBFC1B if it is dead or faulting and you have a current program backup. Check that the series and firmware match your project first. Order the exact 1769-L23E-QBFC1B. The catalog number sets the 512 KB memory, and a different suffix changes it. The 1769-L23E-QBFC1B is not shelf stock, so sourcing time is part of the repair-or-replace decision.

RepairRepair keeps the exact 1769-L23E-QBFC1B your program and licensing were validated on and can preserve the memory contents when no backup exists. It is usually the better call for battery-holder corrosion, a damaged comm port or a failed power section when matching stock is scarce. The two 1769-L23E-QBFC1B symptoms we see most often are “Program lost on power cycle” and “Solid red OK LED (nonrecoverable major fault) at power-up”. If a replacement is already installed, repairing the failed 1769-L23E-QBFC1B 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. Repaired 1769-L23E-QBFC1B 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 1769-L23E-QBFC1B?

The Allen-Bradley 1769-L23E-QBFC1B is a CompactLogix L23E controller, 512 KB user memory, EtherNet/IP port plus RS-232 port, 2 Compact I/O expansion modules, embedded digital, analog and counter I/O.

What condition is the 1769-L23E-QBFC1B in?

The 1769-L23E-QBFC1B is available in Unused surplus / Refurbished / Used condition. We can quote this part in unused surplus, refurbished, or used condition depending on availability and your preference. Specify your requirement in the RFQ.

When does this part ship?

This 1769-L23E-QBFC1B 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 1769-L23E-QBFC1B CompactLogix controller. 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 1769-L23E-QBFC1B has been sourced and is ready, free local pickup is available at NJT Automation, 2122 N Prospect Ave, Milwaukee, WI, during business hours.

What communication ports does the 1769-L23E-QBFC1B have?

EtherNet/IP port plus RS-232 port; 2 Compact I/O expansion modules.

How much memory does the 1769-L23E-QBFC1B have?

512 KB of user memory.