Allen-Bradley 1756-L72 ControlLogix – Ready to Ship / Pick Up
In stock: 1756-L72 4 MB ControlLogix 5570 controller. NJT Automation has 1 unit available in Milwaukee, WI, ready to ship or available for local pickup. Includes a one-year full-function warranty.
$749.99USD
| Part Number | 1756-L72 |
| Description | ControlLogix 5570 controller, 4 MB. In stock in used condition, Series B. |
| 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
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| Returns | 90-day free returns. View return policy |
| Exchange | Send us your defective 1756-L72 after your purchase for a 10% core credit ($75). We also purchase old or damaged parts outright. |
Replacement Options for 1756-L72
In stock and ready to ship today
| Availability | Similar Match Available A similar unit is in stock and ready to ship once you confirm the condition you need. | ||||||||||||||||||||||||||||
| Variants | Part NumberConditionSeriesQtyPrice 1756-L72S /BUsedSeries B1$749.99 USD | ||||||||||||||||||||||||||||
| Repairs | 1756-L72 Mail-In Repair ServiceEstimated: $1,440.00 | ||||||||||||||||||||||||||||
Part Number Decoder | ControlLogix 5570 controller 1756L72 4 MB ControlLogix 5570 controller.
Decoded from the Rockwell Automation catalog-number structure. Series and firmware revision are printed on the product label, not encoded here. | ||||||||||||||||||||||||||||
Physical Data | Weight and DimensionsWeight0.87 lb (0.39 kg)H × W × D5.7 × 1.4 × 5.7 in. (145 × 35 × 145 mm)
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 | |||||||||||||||||||||||||||||
Allen Bradley Information | Technical Description 4 MB ControlLogix 5570 controller. Technical Specifications14 parameters from manufacturer-published specifications
Typical manufacturer-published values for this catalog number; confirm against the current manufacturer documentation before specifying. | ||||||||||||||||||||||||||||
Alternate Part Numbers | 1756L72 | ||||||||||||||||||||||||||||
| Category | ControlLogix | ||||||||||||||||||||||||||||
| Part Number | 1756-L72 | ||||||||||||||||||||||||||||
| Manufacturer | Allen-Bradley | ||||||||||||||||||||||||||||
Previously sold 1756-L723 sold
NJT Automation has supplied and shipped 3 1756-L72 ControlLogix 5570 controllers since 2024; these listings are sold and the in-stock options above are ready to ship.
- Sold
- 3 since 2024
- Price range
- $925 – $3,000
- By condition
- Unused surplus (2)$1,200 – $3,000
- Series
- B × 3
Unused surplus 1756-L72 ControlLogix 5570 controllers have sold for $1,200 – $3,000.
Can the 1756-L72 be repaired?
Yes. NJT Automation offers mail-in repair for the 1756-L72, including diagnostic evaluation, component-level repair, and functional testing.
NJT Managed Repair
One vendor. One warranty. NJT manages the entire process.
- 1-year full-function NJT warranty, with 2- and 3-year options available
- Rush service available for production-critical repairs
- No evaluation or diagnostic charges
- No repair, no charge
- "Unrepairable" is not an option
- Pre-paid UPS shipping label provided for sending your unit in
- $650 minimum repair charge, shipping included both ways
Looking for another option? For lower-cost repairs or if you prefer to work directly with an independent repair specialist, compare bids through RepairMode. RepairMode providers operate independently and set their own pricing and warranty terms.
Find a PLC repair specialiston RepairMode.com ↗Common 1756-L72 failures
Failure patterns we regularly see on ControlLogix 5570 controller hardware like the 1756-L72:
- 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
- Backplane communication faults from bent chassis pins after repeated module swaps
Repair or replace?
ReplaceReplace the 1756-L72 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. Stick with the exact 1756-L72. The suffix sets the 4 MB memory, so a near match is a different unit. The 1756-L72 is on our shelf now and ships the same day for orders placed before 5:00 PM Central.
RepairRepair the 1756-L72 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. Most 1756-L72 units reach our bench with one of two symptoms: “Program lost on power cycle” or “Solid red OK LED (nonrecoverable major fault)”. Already swapped it out? Repairing the failed 1756-L72 turns it into a tested spare on the shelf for the next failure. The 1756-L72 repair is estimated $1,440.00, function-tested before return and covered by a 1-year warranty.
Request a Repair Quote
Text photos of the faulty unit and the symptoms to (414) 331-5954.
All product photos were taken by NJT Automation. Test videos originated from either NJT Automation internally or from repair technicians within our network.
Still have questions?
Find answers to shipping, warranties, repairs, and more.
Frequently Asked Questions
What is the 1756-L72?
The Allen-Bradley 1756-L72 is a 4 MB ControlLogix 5570 controller.
What condition is the 1756-L72 in?
NJT Automation currently has 1 unit of the 1756-L72 in stock in used condition (Series B). 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-L72 cost?
At NJT Automation, 3 1756-L72 ControlLogix 5570 controllers have sold since 2024 for $925 – $3,000. Right now 1 unit is in stock at $750, depending on condition and series.
When does this part ship?
NJT Automation has 1 unit of the 1756-L72 ControlLogix 5570 controller on the shelf in Milwaukee, WI, priced from $749.99. Orders placed before 5:00 PM Central on business days ship the same day; orders placed after the cutoff ship the next business day.
Can you ship this next-day air?
Yes. UPS Next Day Air is available at checkout for the 1756-L72 ControlLogix 5570 controller. Place your order before 5:00 PM Central on a business day and your in-stock item ships the same day for next-business-day delivery.
Can I pick this item up locally?
Yes. Free local pickup is available for the 1 in-stock 1756-L72 unit at NJT Automation, 2122 N Prospect Ave, Milwaukee, WI, during business hours. Contact us to arrange a pickup time.
How much memory does the 1756-L72 have?
4 MB of standard user memory.