Allen-Bradley PLC

Allen-Bradley PLCs are made by Rockwell Automation. Buy new units only through authorized distributors.

Updated Nov 1, 2026. Edited by: Ilyass Ben Hakim.

Where to buy

Rockwell sells through a network of authorized distributors. Use its partner locator to confirm a seller. Rockwell treats new units on open marketplaces as gray market.

Professional insight

Controls engineers match the exact catalog number and firmware first. Then they confirm the seller is authorized.

Gray market units lose Rockwell warranty coverage.
Firmware and software licenses need an authorized purchase.
Check the series letter, not just the catalog number.
Used spares suit test benches, not critical lines.

Check the label

Full catalog number, such as 1769 or 1756 family codes.
Series letter and firmware revision on the side label.
Serial number that matches the box label.
Factory sealed box with Rockwell packaging.
Correct power rating for your panel.
Certification marks such as UL and CE.
Invoice naming an authorized distributor.

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Popular models

Family	Typical use
Micro800	Small standalone machines
MicroLogix	Older small controllers, many in service
CompactLogix	Mid size machines and process skids
ControlLogix	Large plant systems with chassis I/O
PLC-5 and SLC 500	Legacy systems, mostly used spares

Red flags

Seller claims to be authorized but is not in the locator.
Brand new units far below distributor pricing.
Labels that look reprinted or misaligned.
Box seals cut and retaped.
No invoice or serial number record offered.

Questions for the seller

Are you listed in Rockwell's partner locator?
Is the unit new, surplus, used or repaired?
What firmware revision is loaded?
Will Rockwell honor the warranty on this unit?
What is your return policy if it fails on install?

Safe use

Common questions

Is buying an Allen-Bradley PLC on eBay safe?: Rockwell warns these may be used or counterfeit. Warranty does not apply.
Do I need software to program it?: Yes. Rockwell software such as Studio 5000 is licensed separately.
Can I buy direct from Rockwell?: Rockwell lists itself and its authorized distributors as authorized sources.