Allen-Bradley 1747-L542 SLC 500 Processor – Ready to Ship / Pick Up
The Allen-Bradley 1747-L542 is an SLC 5/04 processor with 32K words of user memory. NJT Automation has 3 in stock in Milwaukee, WI: orders placed before 5:00 PM Central ship the same business day. One-year full-function warranty included.
3 in stock.
$1,499.99USD
| Description | SLC 5/04 processor. In stock in used condition, Series B and C. |
| Shipping | Ships today from Milwaukee, WI . 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 and we will have your 1747-L542 at the counter. |
| Warranty | 1-year full-function warranty provided by NJT Automation.Warranty detailsThe original Allen-Bradley warranty does not apply to pre-owned units. Full warranty coverage is provided directly by NJT Automation. If you have any issues we can usually swap your unit next-day air (based on inventory)-no waiting weeks for a repair. Included: 1 Year +1 Year: +15% of product price ($225.00) +2 Years: +25% of product price ($375.00) |
| Returns | 90-day free returns on all purchases.View return policy |
| Exchange | We will purchase your old or damaged parts. |
Replacement Options for 1747-L542
In stock and ready to ship today
| Availability | Multiple Options In Stock |
| Variants | |
| Repairs | 1747-L542 Mail-In Repair Service |
Part Number Decoder | SLC 5/04 processor 1747L542 SLC 5/04 processor with 32K words of user memory; channel 0 RS-232 (DF1 / DH-485 / ASCII) and channel 1 Data Highway Plus (DH+).
Decoded from the Rockwell Automation catalog-number structure. Series and firmware revision are printed on the product label, not encoded here. |
Similar Part Numbers | |
Allen Bradley Information | Technical Description Plc Processor 1 RS-232 1 Dh+ 32 Kb |
Alternate Part Numbers | 1747L542 |
| Category | SLC 500 |
| Part Number | 1747-L542 |
| Manufacturer | Allen-Bradley |
Can the 1747-L542 be repaired?
Yes. NJT Automation offers mail-in repair for the 1747-L542, including diagnostic evaluation, component-level repair, and functional testing.
One vendor. One warranty. NJT manages the entire process.
- 1-year full-function NJT warranty, with 2- and 3-year options available
- Rush service available for production-critical repairs
- No evaluation or diagnostic charges
- No repair, no charge
- Pre-paid UPS shipping label provided for sending your unit in
- $650 minimum repair charge, shipping included both ways
Looking for another option? For lower-cost repairs or if you prefer to work directly with an independent repair specialist, compare bids through RepairMode. RepairMode providers operate independently and set their own pricing and warranty terms.
Find a PLC repair specialiston RepairMode.com ↗Common 1747-L542 failures
Failure patterns we regularly see on SLC 5/04 processor hardware like the 1747-L542:
- Program lost on power cycle: BATT LED on, battery (1747-BA) depleted
- FLT LED on and the processor will not go to RUN (major fault that returns after clearing)
- Channel 0 RS-232 port damaged by a hot-plugged or miswired programming cable
- DH+ channel 1 dead on a 5/04 (transceiver failure on the 3-pin blue-hose port)
- Ethernet port failure or dropped connections on a 5/05
- Keyswitch worn: processor will not stay in RUN or REM
- Backplane connector wear causing intermittent rack faults
Why Choose Our Repair Service?
- ■ Rush turnaround available, with 24-hour emergency service on some models
- ■ 1-year full-function warranty, with 2- and 3-year extended options
- ■ No evaluation or diagnostic charges
- ■ Free UPS shipping label available
- ■ "Unrepairable" is not an option
- ■ Thousands of successful Allen-Bradley restorations
Request a Repair Quote
Ready to repair your 1747-L542? Request a repair quote below. For immediate assistance, text photos of your faulty unit and a description of the symptoms to (414) 331-5954.
Still have questions?
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