Allen-Bradley 1756-L72S ControlLogix Processor 4 MB
In stock: 1 unit in Milwaukee, WI. Physically stocked and ready to ship or available for local pickup. Includes a 1-year full-function warranty.
4 MB GuardLogix 5570 safety controller
Actual NJT inventory photos
Price
$749.99USD
Used units available
| Part Number | 1756-L72S |
| Description | GuardLogix 5570 safety controller, 4 MB. In stock in used 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
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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
Pick a condition and series below. UPS Ground shipping included.
| Variants | Part NumberConditionSeriesQtyPrice 1756-L72S /B$749.99 Used · Series B · 1 in stock1756-L72S /BUsedSeries B1$749.99 USD | ||||||||
| Availability | 1 unit in stock | ||||||||
| Repairs | 1756-L72S Mail-In Repair ServiceEstimated: $1,440.00 | ||||||||
Part Number Decoder | GuardLogix 5570 safety controller 1756L72S
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 | Intended 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. Safety-rated for use in GuardLogix safety chains up to SIL 3 / PLe. | ||||||||
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. | ||||||||
| Category | ControlLogix | ||||||||
| Part Number | 1756-L72S | ||||||||
| Manufacturer | Allen-Bradley | ||||||||
Can the 1756-L72S be repaired?
Yes. NJT Automation repairs the 1756-L72S 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.
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 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
Photos by NJT Automation; test videos from NJT or network repair technicians.
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