Allen-Bradley 1756-L71 ControlLogix Processor 2 MB

Name: Allen-Bradley 1756-L71 ControlLogix Processor
Brand: Allen-Bradley
SKU: 1756-L71
Price: 1199.99 USD
Availability: InStock

In stock: 2 units in Milwaukee, WI. Physically stocked and ready to ship or available for local pickup. Includes a 1-year full-function warranty.

2 MB ControlLogix 5570 controller

Allen-Bradley 1756-L71 ControlLogix 5570 controller, 2 MB – Series B (1 of 6)

Actual NJT inventory photos

Price

$1,199.99USD

Used and refurbished options available

Request Repair QuoteEstimated $1,440.00

Part Number	1756-L71
Description	ControlLogix 5570 controller, 2 MB. In stock in used and refurbished condition, Series B.
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 ($180.00) 3 years +25% of product price ($300.00) View full warranty policy
Returns	90-day free returns. View return policy
Exchange	Send us your defective 1756-L71 after your purchase for a 10% core credit ($120). We also purchase old or damaged parts outright.

Replacement Options for 1756-L71

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

Allen-Bradley 1756-L71 ControlLogix Processor – Series B, Used

Allen-Bradley 1756-L71 ControlLogix Processor – Series B, Used, second photo

Allen Bradley 1756-L71 Series B ControlLogix 5571 Logix5571 CPU 2MB 1756L71 B

$1,199.99 USDIn-stock match

Condition: Used

Series B

1 in stockView details

Allen-Bradley 1756-L71 ControlLogix Processor – Series B, Refurbished, second photo

Allen Bradley 1756-L71 Ser B ControlLogix 5571 Logix5571 Processor 2MB

$1,199.99 USDIn-stock match

Condition: Refurbished

Series B

1 in stockView details

Variants

Part NumberConditionSeriesQtyPrice

1756-L71 /B$1,199.99

Used · Series B · 1 in stock

1756-L71 /BUsedSeries B1$1,199.99 USD

1756-L71 /B$1,199.99

Refurbished · Series B · 1 in stock

1756-L71 /BRefurbishedSeries B1$1,199.99 USD

1756-L71

Refurbished — pick series, then request a quote

Series neededRequest Quote

1756-L71RefurbishedSeries needed—Request Quote

Availability

2 units in stock

Repairs

1756-L71 Mail-In Repair Service

Estimated: $1,440.00

Part Number Decoder

ControlLogix 5570 controller

1756L71

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).
1: Memory size2 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 B 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

Designed 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-L73 Memory size: 8 MB of standard user memory
1756-L75 Memory size: 32 MB of standard user memory

Allen Bradley Information

Technical Specifications14 parameters from manufacturer-published specifications

Controller family	ControlLogix 5570
User memory	2 MB
I/O memory	0.98 MB
Tasks	32
Controller connections	500
Embedded communication	1 × USB (network access via 1756 communication modules)
Digital I/O, max	128,000
Analog I/O, max	4,000
Memory card	1784-SD1 (1 GB SD, included)
Energy storage	1756-ESMCAP energy storage module (no battery)
Backplane current	800 mA @ 5.1V DC
Power dissipation	2.5 W
Chassis slots	1
Weight, approx.	0.25 kg

Typical manufacturer-published values for this catalog number; confirm against the current manufacturer documentation before specifying.

Can the 1756-L71 be repaired?

Yes. NJT Automation repairs the 1756-L71 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.

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Common failures

Failure patterns we regularly see on ControlLogix 5570 controller hardware like the 1756-L71:

SD card corruption preventing the stored project from loading at power-up
Solid red OK LED (nonrecoverable major fault) that returns after clearing
Program lost on power cycle: energy storage module (1756-ESMCAP / ESMNSE) failing to hold the controller through a save
Backplane communication faults from bent chassis pins after repeated module swaps
Scrolling status display blank or unreadable

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-L71?

The Allen-Bradley 1756-L71 is a 2 MB ControlLogix 5570 controller.

What condition is it in?

NJT Automation currently has 2 units of the 1756-L71 in stock in used and refurbished condition (Series B). 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.

When does this part ship?

2 units of the 1756-L71 ControlLogix 5570 controller are on the shelf in Milwaukee, WI, priced from $1,199.99. 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?

2 MB of standard user memory.