Allen-Bradley 1756-L73 ControlLogix – Ready to Ship / Pick Up

Name: Allen-Bradley 1756-L73 ControlLogix Processor
Brand: Allen-Bradley
SKU: 1756-L73
Price: 999.99 USD
Availability: InStock

In stock: 1756-L73 8 MB ControlLogix 5570 controller. NJT Automation has 2 units available in Milwaukee, WI, ready to ship or available for local pickup. Includes a one-year full-function warranty.

Allen-Bradley 1756-L73 ControlLogix 5570 controller, 8 MB – front view

$999.99USD

Request Repair QuoteEstimated $1,440.00

Part Number	1756-L73
Description	ControlLogix 5570 controller, 8 MB. 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 ($150.00) 3 years +25% of product price ($250.00) View full warranty policy
Returns	90-day free returns. View return policy
Exchange	Send us your defective 1756-L73 after your purchase for a 10% core credit ($100). We also purchase old or damaged parts outright.

Replacement Options for 1756-L73

In stock and ready to ship today

Allen-Bradley 1756-L73 Used - Buy 1756-L73 replacement | NJT Automation

Allen-Bradley 1756-L73 Used - alternate view

Allen Bradley 1756-L73 Ser A ControlLogix 8MB Logix5573 Processor 1756L73 A

$999.99 USDIn-stock match

Condition: Used

Series A

2 in stockView details

Variants

Part NumberConditionSeriesQtyPrice

1756-L73 /A$999.99

Used · Series A · 2 in stock

1756-L73 /AUsedSeries A2$999.99 USD

1756-L73

Refurbished — pick series, then request a quote

Series neededRequest Quote

1756-L73RefurbishedSeries needed—Request Quote

Availability

Similar Match Available

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

Repairs

1756-L73 Mail-In Repair Service

Estimated: $1,440.00

Part Number Decoder

ControlLogix 5570 controller

1756L73

8 MB ControlLogix 5570 controller.

1756: BulletinControlLogix: Rockwell Automation's chassis-based control platform (controllers, I/O, communication modules, power supplies and chassis).
L: Module typeLogix controller (CPU module).
7: GenerationControlLogix 5570: Logix5570 series (USB programming port, SD card, energy storage module).
3: Memory size8 MB of standard user memory.

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

Series & Revisions

Series A in stock; other series on request.

All series use the 1756-ESMCAP energy-storage module and a 1784-SD1 / SD2 card; no battery.

Series notes: Studio 5000 keys on catalog number and firmware revision, not series.

Intended Use

Intended for plant-wide discrete, process, and motion control applications. ControlLogix controllers run high I/O-count machines, batch and continuous process lines, and coordinated multi-axis motion from a single chassis, with redundancy and plant-network connectivity when the application calls for it. Typical homes are automotive and tire plants, food and beverage lines, water and wastewater, oil and gas skids, and large packaging systems.

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.

Similar Part Numbers

1756-L72 Memory size: 4 MB of standard user memory
1756-L75 Memory size: 32 MB of standard user memory

Alternate Part Numbers

1756L73

Can the 1756-L73 be repaired?

Yes. NJT Automation repairs the 1756-L73 by mail-in: diagnostic evaluation, component-level repair and a functional test, backed by a 1-year full-function warranty.

NJT managed repair. No evaluation fee; no repair, no charge. Prepaid UPS label both ways, $650 minimum, rush available. 1-year full-function warranty included, 2- and 3-year options.

Get a repair quoteor text photos and symptoms to (414) 331-5954

Prefer an independent shop? Compare bids on RepairMode; providers set their own pricing and warranty.

Find a PLC repair specialiston RepairMode.com ↗

Common 1756-L73 failures

Failure patterns we regularly see on ControlLogix 5570 controller hardware like the 1756-L73:

SD card corruption preventing the stored project from loading at power-up
Front USB port failure: Studio 5000 will not connect over USB
Scrolling status display blank or unreadable
Backplane communication faults from bent chassis pins after repeated module swaps
Program lost on power cycle: energy storage module (1756-ESMCAP / ESMNSE) failing to hold the controller through a save

Repair or replace?

ReplaceReplace the 1756-L73 if it will not boot, shows a solid red fault light, or has lost its program. Another ControlLogix 5570 controller takes the same program: download it, match the firmware, and the line is running again. Order the exact 1756-L73. The catalog number sets the 8 MB memory, and a different suffix changes it. We stock the 1756-L73. Order by 5:00 PM Central for same-day shipping.

RepairRepair the 1756-L73 when the fault is in the power section, a port or the status display rather than the processor core, or when the controller carries a firmware revision or validated project you cannot easily re-flash onto a different unit. The two 1756-L73 symptoms we see most often are “Program lost on power cycle” and “Solid red OK LED (nonrecoverable major fault)”. If a replacement is already installed, repairing the failed 1756-L73 gives you a tested spare on the shelf for the next failure. Expect estimated $1,440.00 for the 1756-L73 repair, with full-function testing and a 1-year warranty included.

Related services:PLC Repair All Repair Services

Photos by NJT Automation; test videos from NJT or network repair technicians.

Still have questions?

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

Frequently Asked Questions

What is the 1756-L73?

The Allen-Bradley 1756-L73 is a 8 MB ControlLogix 5570 controller.

What condition is the 1756-L73 in?

NJT Automation currently has 2 units of the 1756-L73 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-L73 cost?

At NJT Automation, 4 1756-L73 ControlLogix 5570 controllers have sold since 2024 for $700 – $4,000, with a median of $1,425. Right now 2 units are in stock at $1,000, depending on condition and series.

When does this part ship?

2 units of the 1756-L73 ControlLogix 5570 controller are on the shelf in Milwaukee, WI, priced from $999.99. Orders before 5:00 PM Central on a business day ship the same day; next-day air is available at checkout.

How much memory does the 1756-L73 have?

8 MB of standard user memory.