Allen-Bradley 1756-L73 ControlLogix Processor 8 MB

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

In stock: 1 unit in Milwaukee, WI. Physically stocked and ready to ship or available for local pickup. Includes a 1-year full-function warranty.

8 MB ControlLogix 5570 controller

Allen-Bradley 1756-L73 ControlLogix 5570 controller, 8 MB – Series B (1 of 5)

Actual NJT inventory photos

Price

$999.99USD

Used units available

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 same or next business day 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

Pick a condition and series below. UPS Ground shipping included.

Allen-Bradley 1756-L73 ControlLogix Processor – Series A, Used

Allen-Bradley 1756-L73 ControlLogix Processor – Series A, Used, second photo

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

$999.99 USDIn-stock match

Condition: Used

Series A

1 in stockView details

Variants

Part NumberConditionSeriesQtyPrice

1756-L73 /A$999.99

Used · Series A · 1 in stock

1756-L73 /AUsedSeries A1$999.99 USD

1756-L73

Refurbished — pick series, then request a quote

Series neededRequest Quote

1756-L73RefurbishedSeries needed—Request Quote

Availability

1 unit in stock

Repairs

1756-L73 Mail-In Repair Service

Estimated: $1,440.00

Part Number Decoder

ControlLogix 5570 controller

1756L73

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.

Similar Part Numbers

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

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

Compare quotes from independent repair technicians. Post your repair on RepairMode to receive competitive bids from experienced technicians. Each technician sets their own pricing and warranty.

Find a PLC repair specialiston RepairMode.com ↗

Common failures

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

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
Solid red OK LED (nonrecoverable major fault) that returns after clearing
SD card corruption preventing the stored project from loading at power-up

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 it in?

NJT Automation currently has 1 unit of the 1756-L73 in stock in used condition (Series A). Each listing states its own condition and series. Used means a unit removed from service and sold without refurbishment. Cosmetic condition, any functional testing performed, and the warranty term are stated on each unit’s own listing. From the listing: This item is in good working condition with some signs of use and is fully functional. It comes with 90-day free returns and a 1 year NJT warranty.

How much does it 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 1 unit is in stock at $1,000, depending on condition and series.

When does this part ship?

1 unit 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 it have?

8 MB of standard user memory.