Allen-Bradley 1756-L72KK ControlLogix Processor 4 MB

Allen-Bradley 1756-L72KK 4 MB ControlLogix 5570 controller, conformal-coated. NJT Automation sources the 1756-L72KK 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-L72KK ControlLogix 5570 controller, 4 MB – Series B (1 of 3)

Actual NJT inventory photos

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Part Number	1756-L72KK
Price	On Request Availability and condition determine final quote.
Description	ControlLogix 5570 controller, 4 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 3 years +25% of product price View full warranty policy
Returns	90-day free returns. View return policy
Exchange	Send us your defective 1756-L72KK 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-L72KK 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-L72KK Mail-In Repair Service

Part Number Decoder

ControlLogix 5570 controller

1756L72KK

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).
2: Memory size4 MB of standard user memory.
K: CoatingConformal coated: printed circuit boards sealed for corrosive / high-humidity atmospheres (ANSI/ISA S71.04 G3).
K: CoatingConformal coated: printed circuit boards sealed for corrosive / high-humidity atmospheres (ANSI/ISA S71.04 G3).

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

Series & Revisions

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. Conformal coating suits corrosive or high-humidity atmospheres (ANSI/ISA 71.04 G3), such as pulp and paper, wastewater, chemical and coastal sites.

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.

Allen Bradley Information

Technical SpecificationsLifecycle status

Lifecycle	Active Verify current status with the manufacturer.

Can the 1756-L72KK be repaired?

Yes. NJT Automation repairs the 1756-L72KK 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-L72KK:

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-L72KK?

The Allen-Bradley 1756-L72KK is a 4 MB ControlLogix 5570 controller, conformal-coated.

What condition is it in?

The 1756-L72KK may be available on request 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?

The 1756-L72KK 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?

4 MB of standard user memory.