Allen-Bradley 1756-A4 ControlLogix Chassis – Ready to Ship / Pick Up
In stock: 1756-A4 4-slot ControlLogix chassis. NJT Automation has 1 unit available in Milwaukee, WI, ready to ship or available for local pickup. Includes a one-year full-function warranty.
$349.99USD
| Part Number | 1756-A4 |
| Description | ControlLogix chassis. In stock in used condition. |
| 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-A4 after your purchase for a 10% core credit ($35). We also purchase old or damaged parts outright. |
Replacement Options for 1756-A4
In stock and ready to ship today
| Variants | Part NumberConditionSeriesQtyPrice 1756-A4$349.99 Used · 1 in stock1756-A4Used—1$349.99 USD | ||||||||
| Availability | Similar Match Available A similar unit is in stock and ready to ship once you confirm the condition you need. | ||||||||
| Repairs | 1756-A4 Mail-In Repair Service | ||||||||
Part Number Decoder | ControlLogix chassis 1756A4 4-slot ControlLogix chassis.
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. Series notes: Logix keys on catalog number and firmware revision, not series; with the default Compatible Module keying, any series of the same catalog number is accepted in the slot. | ||||||||
Intended Use | Designed for ControlLogix rack-mount applications. The chassis is the backplane for a ControlLogix system; slot count is sized to the controller, communication modules and local I/O a machine or process area needs, with spare slots left for expansion. | ||||||||
Physical Data | Weight and DimensionsWeight1.65 lb (0.75 kg)H × W × D6.7 × 10.3 × 5.7 in. (169 × 262.6 × 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 | |||||||||
| Category | ControlLogix | ||||||||
| Part Number | 1756-A4 | ||||||||
| Manufacturer | Allen-Bradley | ||||||||
Previously sold 1756-A41 sold
NJT Automation has supplied and shipped one 1756-A4 ControlLogix chassis in 2024; these listings are sold and the in-stock options above are ready to ship.
- Sold
- 1 in 2024
- Series
- C × 1
Can the 1756-A4 be repaired?
Yes. NJT Automation repairs the 1756-A4 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 ControlLogix chassis hardware like the 1756-A4:
- Bent or broken backplane connector pins in a slot after repeated module insertions
- One slot dead or intermittent while the rest of the chassis works
- Cracked backplane board from over-torqued mounting hardware
- Corroded backplane contacts in washdown or high-humidity enclosures
- Power-supply connector damage on the left side of the chassis
Photos by NJT Automation; test videos from NJT or network repair technicians.
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