Free tool
Allen-Bradley Catalog Number Decoder
Enter an Allen-Bradley / Rockwell catalog number and we'll identify the product line — ControlLogix, CompactLogix, MicroLogix, PowerFlex, PanelView and more — and flag the discontinued ones.
Allen-Bradley parts are identified by a catalog number that starts with a bulletin number — the leading digits that tell you the product family. 1756 is ControlLogix, 1769 is CompactLogix, 25B is a PowerFlex 525. Type your number above, then request a quote and we'll source it — including obsolete SLC 500, PLC-5 and MicroLogix parts.
Common Allen-Bradley bulletins
The leading digits of the catalog number identify the line:
| Bulletin | Product line |
|---|---|
| 1756 | ControlLogix (large rack) |
| 1769 | CompactLogix / Compact I/O |
| 5069 | CompactLogix 5380 / Compact 5000 |
| 1734 / 1794 | POINT I/O / FLEX I/O (distributed) |
| 1746 / 1747 | SLC 500 (legacy) |
| 1785 / 1771 | PLC-5 (legacy) |
| 1761–1766 | MicroLogix (legacy) |
| 2080 | Micro800 |
| 20A–20G | PowerFlex 70/700/753/755 drives |
| 22A–22F | PowerFlex 4/40/400 drives |
| 25A–25C | PowerFlex 523/525/527 drives |
| 2711 / 2711P | PanelView Standard / Plus HMI |
| 100 / 700 / 800 | Contactors, relays, operator devices |
| 140 | Motor protection |
Frequently asked questions
What is a bulletin number?
It's the leading part of an Allen-Bradley catalog number that identifies the product family — for example 1756 (ControlLogix), 1769 (CompactLogix), or 25B (PowerFlex 525). Recognizing the bulletin is the fastest way to know what a part is.
What does the rest of the catalog number mean?
After the bulletin, letters and digits describe the specific module, rating and I/O count (e.g. 1756-L71 is a ControlLogix controller; 1769-IF8 is an 8-channel analog input). A trailing series letter (A/B/C) marks hardware revisions that can affect firmware compatibility — quote the full number including the series.
Which lines are obsolete?
SLC 500 (1746/1747), PLC-5 (1785/1771) and most MicroLogix are end-of-life or discontinued; they typically migrate to CompactLogix (1769) or ControlLogix (1756). We still source the legacy parts to keep existing systems running.
Need an Allen-Bradley part sourced?
Send us the catalog number — including discontinued ControlLogix, SLC 500 or PLC-5 modules — and we'll identify it and quote availability, condition and price.