Allen-Bradley 1756-L55M14 ControlLogix Processor

Allen-Bradley 1756-L55M14 ControlLogix 5555 controller bundled with a 3.5 MB battery-backed 1756-M14 memory board. NJT Automation sources the 1756-L55M14 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-L55M14 ControlLogix 5555 controller – front view

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Part Number	1756-L55M14
Price	On Request Previously sold for $389.99 USDAvailability and condition determine final quote.
Description	ControlLogix 5555 controller.
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 ($58.50) 3 years +25% of product price ($97.50) View full warranty policy
Returns	90-day free returns. View return policy
Exchange	Send us your defective 1756-L55M14 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

1756-L55M14 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 5555 controller

1756L55M14

ControlLogix 5555 controller bundled with a 3.5 MB battery-backed 1756-M14 memory board.

1756: BulletinControlLogix: Rockwell Automation's chassis-based control platform (controllers, I/O, communication modules, power supplies and chassis).
L: Module typeLogix controller (CPU module).
55: GenerationControlLogix 5555 (Logix5555): first-generation ControlLogix controller; requires a 1756-M1x / M2x memory board to run (RSLogix 5000 up to v16).
M14: Memory board3.5 MB user memory on a factory-fitted 1756-M14 memory board: battery-backed RAM (1756-BA1 battery required to retain the project).

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 DimensionsWeight0.87 lb (0.39 kg)H × W × D5.7 × 1.4 × 5.7 in. (145 × 35 × 145 mm)

Weight	0.39 kg (0.87 lb) Typical unit weight
Dimensions (H × W × D)	145 × 35 × 145 mm (5.7 × 1.4 × 5.7 in.) Single-slot controller module
Shipping Weight	0.92 kg (2.03 lb) Estimated: unit weight plus box and packing material; bills as 3 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.

Alternate Part Numbers

1756L55M14

Previously sold 1756-L55M14

1 sold

NJT Automation has supplied and shipped one 1756-L55M14 ControlLogix 5555 controller in 2025; request a quote and we will source another from our supplier network.

Sold: 1 in 2025
Price: $390
Series: A × 1

The one 1756-L55M14 ControlLogix 5555 controller sold in 2025 was unused surplus and went for $390.

Sold

Allen Bradley 1756-L55 /A Logix 5555 Module + 1756-M14 A / 1756-L55M14

$389.99 USD

Unused surplus (new old stock)

Request Quote

Can the 1756-L55M14 be repaired?

Yes. NJT Automation offers mail-in repair for the 1756-L55M14, 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-L55M14 failures

Failure patterns we regularly see on ControlLogix 5555 controller hardware like the 1756-L55M14:

Program lost on power cycle: battery-backed 1756-M1x memory board with a depleted battery
Memory board (1756-M12 / M13 / M14 / M16) failure showing as a solid red OK LED
RS-232 serial port damage from hot-plugged programming cables
Backplane communication faults from worn chassis connectors
Nonrecoverable major faults after a chassis power-supply brownout

Repair or replace?

ReplaceReplacement ControlLogix 5555 controller units are usually surplus or refurbished. Replace the 1756-L55M14 if it is dead or faulting and you have a current program backup. Check that the series and firmware match your project first. The 1756-L55M14 is not shelf stock, so sourcing time is part of the repair-or-replace decision.

RepairRepair keeps the exact 1756-L55M14 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 1756-L55M14 symptoms we see most often are “Program lost on power cycle” and “Memory board (1756-M12 / M13 / M14 / M16) failure”. If a replacement is already installed, repairing the failed 1756-L55M14 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 1756-L55M14 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-L55M14?

The Allen-Bradley 1756-L55M14 is a ControlLogix 5555 controller bundled with a 3.5 MB battery-backed 1756-M14 memory board.

What condition is the 1756-L55M14 in?

The 1756-L55M14 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 1756-L55M14 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-L55M14 ControlLogix 5555 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 1756-L55M14 has been sourced and is ready, free local pickup is available at NJT Automation, 2122 N Prospect Ave, Milwaukee, WI, during business hours.