The Allen-Bradley SLC 500 is a retired PLC platform. Rockwell Automation has discontinued the family and ended active production. The recommended migration path is CompactLogix (5370/5380 series), which Rockwell supports with dedicated SLC-to-CompactLogix conversion tools. If you need to keep an existing machine running without re-engineering, Edmundson Industrial sources new-surplus, used-tested, and reconditioned SLC 500 processors, 1746 I/O modules, racks, and power supplies.
| Brand | Allen-Bradley / Rockwell Automation |
| Family | SLC 500 (1746 / 1747 series) |
| Common catalog numbers | 1747-L552, 1747-L551, 1747-L542, 1747-L532 (processors) · 1746-OW16, 1746-IA16, 1746-NI8, 1746-IB16 (I/O) · 1746-P2 (power supply) · 1746-A4/A7/A10/A13 (racks) |
| Lifecycle | Discontinued / end-of-life — verify current Rockwell status at quote |
| Programming | RSLogix 500 (legacy) |
| If you have (obsolete) | Recommended path | Notes |
|---|---|---|
| SLC 5/05 (1747-L551 / L552) | CompactLogix 5380 (5069-L306ER class) | Rockwell migration path. Reprogram in Studio 5000; conversion tools assist, but plan I/O remapping and checkout time. |
| SLC 5/03 – 5/04 (1747-L532 / L542) | CompactLogix 5370 / 5380 | Same path. Communications change from DH-485 / DH+ to EtherNet/IP — confirm what else on the network talks to the SLC before migrating. |
| Any SLC — keep program running | New-surplus / used-tested SLC 500 (we source) | Fastest path, zero re-engineering. Match processor series and verify OS / firmware revision against your program. |
| 1746 I/O modules | Like-for-like 1746 surplus, or 5069 Compact I/O on migration | I/O wiring conversion systems exist for migrations — ask when planning. |
| 1746 racks / power supplies | Like-for-like surplus | Shelf spares for P2 power supplies are cheap downtime insurance. |
Cross-references are starting points — confirm processor series, rack slot count, I/O mix, and program compatibility before substituting. Send your catalog numbers and we'll verify the match.
No. Rockwell retired the SLC 500 platform and active support has ended. Plants running SLC-based machines have two practical options: migrate to CompactLogix on a planned schedule, or keep critical spares — processor, power supply, key I/O — on the shelf from the surplus market. Most maintenance teams do both: spares buy time to migrate on your schedule instead of during an outage.
Edmundson Industrial sources SLC 500 components in new-surplus, used-tested, and reconditioned condition as available. Condition is always disclosed before sale, with photos on request.
or send catalog numbers to sales@edmundsonindustrial.com · (832) 975-8827 · Houston, TX. Same-day response on most requests. Line down? Say so in the subject line.
Condition disclosed before sale. Same-day response on most requests.