Allen-Bradley 1756-L71 ControlLogix – Repair Service Available

Allen-Bradley 1756-L71 2 MB ControlLogix 5570 controller. NJT Automation offers mail-in repair for the 1756-L71 with a 1-year warranty; replacement pricing is available on request.

Mail-in repair available now. Returned with a 1-year warranty. Replacement pricing on request.

Allen-Bradley 1756-L71 ControlLogix 5570 controller, 2 MB – front view

Request Replacement Quote Request Repair QuoteEstimated $1,440.00

Part Number	1756-L71
Price	On Request Previously sold for $1,419.99 - $1,999.99 USDAvailability and condition determine final quote.
Description	ControlLogix 5570 controller, 2 MB.
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 ($256.50) 3 years +25% of product price ($427.50) 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. We also purchase old or damaged parts outright.

Availability

Sourced on request

We do not have a 1756-L71 on the shelf right now. We can source one through our supplier network; request a quote and we confirm availability, price and lead time before you commit.

Sourcing

Sourced through our Level 1 network of vetted US suppliers. Each unit is checked before it ships and carries the same NJT warranty and return policy as our own stock. Quotes within one hour during business hours; typical delivery 3–5 business days, next-day air available. Sourced parts are not available for local pickup.

Request Quote How Level 1 sourcing works

Repairs

1756-L71 Mail-In Repair Service

Estimated: $1,440.00

Part Number Decoder

ControlLogix 5570 controller

1756L71

2 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).
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

No series in stock today; request a series above.

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.

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-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.

Previously sold 1756-L71

2 sold

NJT Automation has supplied and shipped 2 1756-L71 ControlLogix 5570 controllers in 2024; request a quote and we will source another from our supplier network.

Sold: 2 in 2024
Series: B × 2

Sold

2023 Allen Bradley 1756-L71 /B GuardLogix Processor Module - New Sealed Surplus

$1,419.99 USD

Unused surplus (new old stock)

Request Quote

Sold

2022 Allen Bradley 1756-L71S /B GuardLogix Processor Module - New Sealed Surplus

$1,999.99 USD

Unused surplus (new old stock)

Request Quote

5 sold on eBay

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.

Find a PLC repair specialiston RepairMode.com ↗

Common failures

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

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
Front USB port failure: Studio 5000 will not connect over USB
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?

The 1756-L71 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.

How much does it cost?

At NJT Automation, 2 1756-L71 ControlLogix 5570 controllers have sold in 2024 for $1,420 – $2,000. None are in stock at the moment; request a quote for current pricing, or have your ControlLogix 5570 controller repaired for an estimated $1,440.

When does this part ship?

The 1756-L71 is sourced on request. Request a quote and we'll confirm availability and lead time, typically a few business days.

How much memory does it have?

2 MB of standard user memory.