Allen-Bradley 1747-L542 SLC 500 Processor
In stock: 2 units in Milwaukee, WI. Physically stocked and ready to ship or available for local pickup. Includes a 1-year full-function warranty.
SLC 5/04 PLC Processor · 32K Words User Memory · channel 0 RS-232 (DF1 / DH-485 / ASCII) and channel 1 Data Highway Plus (DH+)
Actual NJT inventory photos
Starting at
$129.99USD
Used units available
| Part Number | 1747-L542 |
| Description | SLC 5/04 PLC Processor. In stock in used condition, Series B and C. |
| Shipping | Ships same or next business day UPS Ground included | Next-Day Air and Worldwide Shipping available at checkout |
| Pickup | Free local pickup at 2122 N Prospect Ave. Call ahead at (414) 331-5954. |
| Warranty | 1-year full-function warranty provided by NJT Automation. Warranty details
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| Returns | 90-day free returns. View return policy |
| Exchange | Send us your defective 1747-L542 after your purchase for a 10% core credit (from $13). We also purchase old or damaged parts outright. |
Replacement Options for 1747-L542
Pick a condition and series below. UPS Ground shipping included.
| Variants | |||||||||
| Availability | 2 units in stock | ||||||||
Part Number Decoder | SLC 5/04 PLC Processor 1747L542
Decoded from the Rockwell Automation catalog-number structure. Series and firmware revision are printed on the product label, not encoded here. | ||||||||
Series & Revisions | Series B and C in stock; other series on request. Series A shipped with OS400, later series with OS401; the 1747-OS401 cartridge upgrades earlier units. Series notes: Same slot and wiring. A later series runs an earlier program; a program that needs OS401 will not load on Series A. | ||||||||
Intended Use | Designed for DH+-networked legacy machine and small-process control applications. SLC 500 processors still run packaging lines, conveyors, water and wastewater stations, HVAC plants and OEM machinery installed through the 1990s and 2000s. Most demand today is replacing a failed processor like-for-like so the existing rack, I/O and RSLogix 500 program stay in place. | ||||||||
Migration Path | Rockwell Automation has discontinued SLC 500 processors; replacement units come from the surplus market. Published successor for the SLC 500 modular processor: CompactLogix 5380 (5069-L3xxER) with Compact 5000 I/O, or CompactLogix 5370 (1769-L3xER) to reuse 1769 Compact I/O.
A like-for-like replacement or a repair keeps the existing program, wiring and panel layout; a migration is a project. Both are listed on this page so the choice can be made on lead time and budget. | ||||||||
Physical Data | Weight and DimensionsEst. weight0.82 lb (0.37 kg)H × W × D5.7 × 1.4 × 5.7 in. (145 × 35 × 145 mm)
Product dimensions are typical manufacturer-published values and may differ by series or option. Unit weight is an estimate; no published figure is available for this catalog number. Shipping box and weight are estimates for freight planning; the packed unit may ship in a different box. | ||||||||
Similar Part Numbers | |||||||||
| Category | SLC 500 | ||||||||
| Part Number | 1747-L542 | ||||||||
| Manufacturer | Allen-Bradley | ||||||||
Previously sold 1747-L5423 sold
NJT Automation has supplied and shipped 3 1747-L542 SLC 5/04 PLC Processors since 2024; these listings are sold and the in-stock options above are ready to ship.
- Sold
- 3 since 2024
- Series
- C × 2
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