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Obsolete SLC 500 Parts Sourcing

Discontinued platform parts, sourced globally and tested before shipping.

Overview

The Allen-Bradley SLC 500 was the most-installed mid-range PLC in North American industry — and it has been discontinued for years. TGK Parts maintains an active sourcing line for obsolete SLC 500 parts: CPUs, 1746 I/O modules, power supplies, communications modules and accessories.

Send the catalogue number or a nameplate photo — we reply within 12 hours with availability, condition grade and price. Program transfer support available.

Parts We Source

CPUs1747-L511/521/531/541/551 (5/01-5/05), incl. L551 32KB top model
Digital I/O1746-IB8/IB16/IB32 (input), 1746-OB8/OB16/OB32/OV8/OW16 (output), 1746-IV8/IV16, 1746-OVP16
Analog & special1746-NI4/NI8/NI16I (analog in), 1746-NO4I/NO4V (analog out), 1746-HSCE (high-speed counter), 1746-BAS (BASIC module)
Power supplies1746-P1/P2/P3/P4/P5/P6/P7, 1746-N2 (network power)
Comms & accessories1747-KE (DH-485), 1747-UIC (USB), 1746-Rack chassis 4/13-10/16, 1747-BA batteries, 1746-P3 replacements

How Sourcing Works

  1. Send the MPN or a nameplate photo — we confirm the exact revision
  2. Global sourcing — verified surplus dealers, decommissioned stock and integrator inventories are queried within hours
  3. Quote within 12 hours — availability, condition grade, price and lead time
  4. Test and ship — bench-tested before shipping, with photos and a 12-month warranty

Related Pages

FAQ

Is any SLC 500 part still available new?

No — the SLC 500 platform is discontinued. We supply tested surplus with a 12-month warranty.

Can you source SLC 500 power supplies like the 1746-P3?

Yes — power supplies are a core sourcing line. Send the catalogue number for a quote.

Do you test all 16 points on input modules before shipping?

Yes — every module is tested point-by-point on a live test rack with real 24V signals.

Can you pre-load my SLC 500 program?

Yes — send your APS backup file and we load, verify and test the processor before shipping.

What if my SLC 500 CPU cannot be found?

We propose alternatives within the first update cycle: a compatible revision, a tested refurbished exchange, or an engineered migration path.