Allen-Bradley 1747-L552 SLC 500 Processor – Ready to Ship / Pick Up
In stock: 1747-L552 SLC 5/05 PLC Processor, 32K 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.
From $999.99USD
| Part Number | 1747-L552 |
| Description | SLC 5/05 PLC Processor. In stock in used and refurbished condition, Series A, B, C and D. |
| 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-L552 after your purchase for a 10% core credit (from $100). We also purchase old or damaged parts outright. |
Replacement Options for 1747-L552
In stock and ready to ship today
| Variants | Part NumberConditionSeriesQtyPrice 1747-L552 /A$999.99 Used · Series A · 1 in stock1747-L552 /AUsedSeries A1$999.99 USD 1747-L552 /B$1,199.99 Used · Series B · 1 in stock1747-L552 /BUsedSeries B1$1,199.99 USD 1747-L552 /A$1,249.99 Refurbished · Series A · 1 in stock1747-L552 /ARefurbishedSeries A1$1,249.99 USD 1747-L552 /C$1,299.99 Used · Series C · 1 in stock1747-L552 /CUsedSeries C1$1,299.99 USD 1747-L552 /C$1,299.99 Used · Series C · 1 in stock1747-L552 /CUsedSeries C1$1,299.99 USD 1747-L552 /C$1,379.99 Refurbished · Series C · 1 in stock1747-L552 /CRefurbishedSeries C1$1,379.99 USD 1747-L552 /D$1,449.99 Used · Series D · 1 in stock1747-L552 /DUsedSeries D1$1,449.99 USD 1747-L552 /D$1,799.99 Refurbished · Series D · 1 in stock1747-L552 /DRefurbishedSeries D1$1,799.99 USD | ||||||||||||||||||||||||
| Availability | Multiple Options Available | ||||||||||||||||||||||||
| Repairs | 1747-L552 Mail-In Repair Service | Flat RateFlat rate: $949.99 | ||||||||||||||||||||||||
Part Number Decoder | SLC 5/05 PLC Processor 1747L552 SLC 5/05 PLC Processor, 32K 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. | ||||||||||||||||||||||||
Series & Revisions | Series A, B, C and D in stock; other series on request. Series A shipped with OS500 and can be flashed to OS501; Series B and C ship with OS501. Only Series C hardware has the 10/100 Mbps Ethernet port; A and B run 10 Mbps half duplex. Series notes: Same slot and wiring. A later series runs an earlier program; an earlier series rejects a program that uses newer OS/FRN features. | ||||||||||||||||||||||||
Intended Use | Built for Ethernet-connected 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. | ||||||||||||||||||||||||
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 Specifications12 parameters from manufacturer-published specifications
Typical manufacturer-published values for this catalog number; confirm against the current manufacturer documentation before specifying. | ||||||||||||||||||||||||
| Category | SLC 500 | ||||||||||||||||||||||||
| UPC / GTIN | 0662072745588 | ||||||||||||||||||||||||
| Part Number | 1747-L552 | ||||||||||||||||||||||||
| Manufacturer | Allen-Bradley | ||||||||||||||||||||||||
Previously sold 1747-L5523 sold
NJT Automation has supplied and shipped 3 1747-L552 SLC 5/05 PLC Processors since 2024; these listings are sold and the in-stock options above are ready to ship.
- Sold
- 3 since 2024
- Series
- A × 1, B × 1, C × 1
Can the 1747-L552 be repaired?
Yes. NJT Automation repairs the 1747-L552 by mail-in: diagnostic evaluation, component-level repair and a functional test, backed by a 1-year full-function warranty.
NJT managed repair. No evaluation fee; no repair, no charge. Prepaid UPS label both ways, $650 minimum, rush available. 1-year full-function warranty included, 2- and 3-year options.
Compare quotes from independent repair technicians. Post your repair on RepairMode to receive competitive bids from experienced technicians. Each technician sets their own pricing and warranty.
Find a PLC repair specialiston RepairMode.com ↗Common failures
Failure patterns we regularly see on SLC 5/05 PLC Processor hardware like the 1747-L552:
- 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)
- Channel 0 RS-232 port damaged by a hot-plugged or miswired programming cable
Documented failure modes
Commonly reported issues for the Allen-Bradley 1747-L552 include Intermittent fault and No communication. flt light blinking, 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.
Photos by NJT Automation; test videos from NJT or network repair technicians.
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