Allen-Bradley 1756-L72S ControlLogix – Ready to Ship / Pick Up
In stock: 1756-L72S GuardLogix 5570 safety controller, 4 MB GuardLogix 5570 safety 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-L72S |
| Description | GuardLogix 5570 safety 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-L72S after your purchase for a 10% core credit ($75). We also purchase old or damaged parts outright. |
Replacement Options for 1756-L72S
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-L72S Mail-In Repair ServiceEstimated: $1,440.00 | ||||||||
Part Number Decoder | GuardLogix 5570 safety controller 1756L72S 4 MB GuardLogix 5570 safety 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. | ||||||||
Allen Bradley Information | Technical Description 4 MB GuardLogix 5570 safety controller. | ||||||||
Alternate Part Numbers | 1756L72S | ||||||||
| Category | ControlLogix | ||||||||
| Part Number | 1756-L72S | ||||||||
| Manufacturer | Allen-Bradley | ||||||||
Can the 1756-L72S be repaired?
Yes. NJT Automation offers mail-in repair for the 1756-L72S, 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-L72S failures
Failure patterns we regularly see on GuardLogix 5570 safety controller hardware like the 1756-L72S:
- 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
- Program lost on power cycle: energy storage module (1756-ESMCAP / ESMNSE) failing to hold the controller through a save
Repair or replace?
ReplaceReplace the 1756-L72S if it will not boot, shows a solid red fault light, or has lost its program. Another GuardLogix 5570 safety controller takes the same program: download it, match the firmware, and the line is running again. Order the exact 1756-L72S. The catalog number sets the 4 MB memory, and a different suffix changes it. We stock the 1756-L72S. Order by 5:00 PM Central for same-day shipping.
RepairRepair the 1756-L72S 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. The two 1756-L72S symptoms we see most often are “Program lost on power cycle” and “Solid red OK LED (nonrecoverable major fault)”. If a replacement is already installed, repairing the failed 1756-L72S gives you a tested spare on the shelf for the next failure. Expect estimated $1,440.00 for the 1756-L72S repair, with full-function testing and a 1-year warranty included.
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-L72S?
The Allen-Bradley 1756-L72S is a GuardLogix 5570 safety controller: 4 MB GuardLogix 5570 safety controller.
What condition is the 1756-L72S in?
NJT Automation currently has 1 unit of the 1756-L72S 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.
When does this part ship?
NJT Automation has 1 unit of the 1756-L72S GuardLogix 5570 safety 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-L72S GuardLogix 5570 safety 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-L72S 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-L72S have?
4 MB of standard user memory plus 2 MB of safety memory.