Allen-Bradley 1747-L551 SLC 500 Processor – Ready to Ship / Pick Up
In stock: 1747-L551 SLC 5/05 PLC Processor, 16K Words User Memory. NJT Automation has 8 units available in Milwaukee, WI, ready to ship or available for local pickup. Includes a one-year full-function warranty.
$999.99 – $1,419.99USD
| Part Number | 1747-L551 |
| Description | SLC 5/05 PLC Processor. In stock in used and refurbished condition, Series C. |
| Shipping | Ships today 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-L551 after your purchase for a 10% core credit ($100 – $142). We also purchase old or damaged parts outright. |
Replacement Options for 1747-L551
In stock and ready to ship today
| Availability | Multiple Options Available | ||||||||||||||||||||||||
| Variants | |||||||||||||||||||||||||
| Repairs | 1747-L551 Mail-In Repair Service | Flat RateFlat rate: $949.99 | ||||||||||||||||||||||||
Part Number Decoder | SLC 5/05 PLC Processor 1747L551 SLC 5/05 PLC Processor, 16K Words User Memory; channel 0 RS-232 (DF1 / DH-485 / ASCII) and channel 1 Ethernet (10Base-T; 10/100 on later series).
Decoded from the Rockwell Automation catalog-number structure. Series and firmware revision are printed on the product label, not encoded here. | ||||||||||||||||||||||||
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. | ||||||||||||||||||||||||
Datasheet | Datasheet available for download Generated from product specifications; not an official Allen-Bradley datasheet. For an official datasheet, contact Allen-Bradley or an authorized distributor. | ||||||||||||||||||||||||
Similar Part Numbers | |||||||||||||||||||||||||
Allen Bradley Information | Technical Description SLC 5/05 PLC Processor, 16K Words User Memory; channel 0 RS-232 (DF1 / DH-485 / ASCII) and channel 1 Ethernet (10Base-T; 10/100 on later series). Lifecycle: Discontinued. Verify current status with the manufacturer. Technical Specifications12 parameters from manufacturer-published specifications
Typical manufacturer-published values for this catalog number; confirm against the current manufacturer documentation before specifying. | ||||||||||||||||||||||||
Alternate Part Numbers | 1747L551 | ||||||||||||||||||||||||
| Category | SLC 500 | ||||||||||||||||||||||||
| UPC / GTIN | 0662072745625 | ||||||||||||||||||||||||
| Part Number | 1747-L551 | ||||||||||||||||||||||||
| Manufacturer | Allen-Bradley | ||||||||||||||||||||||||
Previously sold 1747-L5516 sold
NJT Automation has supplied and shipped 6 1747-L551 SLC 5/05 PLC Processors since 2024; these listings are sold and the in-stock options above are ready to ship.
- Sold
- 6 since 2024
- Price range
- $900 – $1,900, median $1,250
- By condition
- Used (5)$900 – $1,900
- Series
- A × 3, B × 2, C × 1
Used 1747-L551 SLC 5/05 PLC Processors have sold for $900 – $1,900, typically around $1,250.
Can the 1747-L551 be repaired?
Yes. NJT Automation offers mail-in repair for the 1747-L551, 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
- "Unrepairable" is not an option
- 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.
See completed 1747-L551 repairson RepairMode.com ↗Common 1747-L551 failures
Failure patterns we regularly see on SLC 5/05 PLC Processor hardware like the 1747-L551:
- 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
- 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)
Repair or replace?
Documented failure modes
Commonly reported issues for the Allen-Bradley 1747-L551 include No comms on rs232 and No fault found, based on recent completed repairs. These are compiled from customer issue descriptions and technician repair notes. A technician confirms the actual root cause of each unit during evaluation.
Request a Repair Quote
Text photos of the faulty unit and the symptoms to (414) 331-5954.
All product photos were taken by NJT Automation. Test videos originated from either NJT Automation internally or from repair technicians within our network.
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