Allen-Bradley Cross-Reference — Obsolete & Legacy Replacement Guide

Rockwell Automation has retired entire generations of Allen-Bradley hardware — the MicroLogix and SLC 500 PLC families, PLC-5, the PowerFlex 4-class and 70/700 drives, PanelView Plus 6 and earlier HMIs, and a long list of communication and I/O modules. This page maps each retired family to its modern Rockwell migration path, and links to detailed cross-reference pages. For every family listed, Edmundson Industrial sources new-surplus, used-tested, and reconditioned replacements — usually the fastest way to get a stopped machine running again.

Legacy-to-Modern: the quick map

PLCs & Controllers

Retired family	Common catalogs	Modern path	Detail page
MicroLogix 1400	1766-L32…	Micro850 (2080-LC50) / CompactLogix	MicroLogix 1400 →
MicroLogix 1100	1763-L16…	Micro820 (2080-LC20) / Micro850	MicroLogix 1100 →
MicroLogix 1500 / 1200 / 1000	1764 / 1762 / 1761	Micro800-series by size	MicroLogix 1500 / 1200 / 1000 →
SLC 500	1747 processors, 1746 I/O	CompactLogix 5370/5380	SLC 500 →
PLC-5	1785-L…	ControlLogix (1756)	PLC-5 →
CompactLogix L4x (retired)	1768-L43/L45	CompactLogix 5380	CompactLogix L4x →

Drives

Retired family	Common catalogs	Modern path	Detail page
PowerFlex 70	20A-…	PowerFlex 525 / 753 / 755	PowerFlex 70 →
PowerFlex 40	22B-…	PowerFlex 525	PowerFlex 40 →
PowerFlex 4 / 400	22A- / 22C-…	PowerFlex 523/525 by rating	PowerFlex 4 / 400 →
PowerFlex 700 / 700S	20B- / 20D-…	PowerFlex 753 / 755	PowerFlex 700 / 700S →
1336 Plus / 1305	1336… / 1305…	PowerFlex by rating	1336 / 1305 →

HMI, I/O & Communications

Retired family	Common catalogs	Modern path	Status
PanelView Plus 6 (and earlier)	2711P-…	PanelView Plus 7	We source surplus displays and modules
1756-ENBT EtherNet module	1756-ENBT	1756-EN2T / EN2TR	We source surplus
1746 SLC I/O	1746-OW16, IA16, NI8…	5069 Compact I/O on migration	We source like-for-like surplus
1761-NET-ENI interface	1761-NET-ENI	Embedded Ethernet on modern platforms	We source surplus
Flex I/O (retiring)	1794-IB16, OB16…	5094 FLEX 5000	We source surplus

Motion

Retired family	Common catalogs	Modern path	Status
Kinetix 6000	2094-…	Kinetix 5500 / 5700	We source surplus
Kinetix 300 / Ultra 3000	2097- / 2098-…	Kinetix 5100 / 5300-class	We source surplus

Every cross-reference above is a starting point, not a guarantee of fit. Catalog suffixes carry voltage, I/O type, enclosure, and option codes that decide whether a swap is drop-in or a project. Send your full catalog number — or a nameplate photo — and we'll verify before you buy.

How to use this guide when a machine is down

Pull the full catalog number from the unit nameplate — the complete string, not just the family name.
Decide: drop-in or migrate. Drop-in surplus restarts the machine today with zero re-engineering. Migration to the modern platform is the long-term answer — do it at a planned stop.
Send the number to us. We quote condition, price, and lead time — same-day on most requests. If the modern replacement means panel changes, our fabrication side supplies custom sub-panels, adapter plates, and modified enclosures so new hardware lands in the old footprint.

FAQ

What does "cross-reference" mean for obsolete Allen-Bradley parts?

It's the mapping from a retired catalog number to either its modern Rockwell replacement or an equivalent surplus unit. Both paths are valid — one fixes today, the other plans for the next decade.

Is Edmundson Industrial an authorized Rockwell distributor?

No — we are an independent industrial surplus and sourcing company. We supply new-surplus, used-tested, and reconditioned Allen-Bradley equipment with condition fully disclosed before sale.

Which retired Allen-Bradley families do you source?

MicroLogix, SLC 500, PLC-5, PowerFlex 4-class and 70/700-series drives, PanelView, legacy ControlLogix and SLC I/O and communication modules, and Kinetix/Ultra motion — plus current-production AB hardware on a sourcing basis.

How fast can you quote?

Same-day on most requests. If a line is down, say so in the subject line and we treat it that way.

What if I don't know the part number?

Send a photo of the nameplate — or of the whole unit in the panel. Identifying legacy hardware from photos is normal work for us.

Request a Quote

or send catalog numbers / nameplate photos to sales@edmundsonindustrial.com · (832) 975-8827 · Houston, TX.

Edmundson Industrial — independent industrial electrical supply and sourcing, Houston, TX. Obsolete and hard-to-find specialists with in-house fabrication capability.