How do I confirm availability for 1747-L551?
Send the complete part number, required quantity, condition and any hardware or firmware requirement. We check current supply and confirm the offered unit and lead time on your quote.
Allen-Bradley
1747-L551
Allen-Bradley 1747-L551 16 K-word SLC 5/05 processor
Allen-Bradley
Details updated 9/20/2026
Request a quote for 1747-L551Product Description
The Allen-Bradley 1747-L551 is an SLC 5/05 processor with 16 K words of memory and Ethernet and RS-232. Match the communication network and project requirements before choosing another memory or processor variant. Send the complete part number, quantity, destination and required condition. The offered unit's version, accessories, testing details, price and dispatch timing are confirmed on the quote.
Specifications
- Category
- PLCs and Machine Control
- Product family
- SLC 500Source
- Product type
- 16 K-word SLC 5/05 processorSource
- Processor family
- SLC 5/05Source
- Memory size
- 16 K wordsSource
- On-board communications
- Ethernet and RS-232Source
- Local expansion limit
- Up to 3 chassis / 30 total slotsSource
- Programming software
- RSLogix 500Source
- Backplane current at 5 V DC
- 1000 mASource
- Typical program scan
- 0.9 ms per 1 K simple ladder program; actual time depends on program and communicationsSource
- Ethernet capability by series
- Series C supports 100 Mbit/s and up to 32 connections; verify earlier-series limits separatelySource
Before ordering 1747-L551
- Memory is stated in words, not bytes. Check the saved program and data allocation, firmware, memory module and battery condition for the replacement.
- Confirm the actual SLC 5/05 hardware series and network requirements. The reviewed guide ties 100 Mbit/s Ethernet and up to 32 connections to Series C; verify the limits of an earlier-series unit separately.
- Match the complete 1747-L551 catalog number, chassis, power budget and RSLogix 500 project configuration. List required connectors, memory modules and other accessories individually.
- Send quantity, destination, required condition and test scope. Actual version, available unit photos, included items, price and dispatch timing are confirmed on the quote.
For photos, test scope and quote checks, see the used PLC parts buying guide.
Condition requirements: New, Never Used, Refurbished, Used, For Parts / Repair. Select your preferred condition in the quote form; current supply is confirmed separately. Condition guide
- Current supply
- Confirm on quote
- Offered condition
- Specify your requirement
- Hardware / firmware
- Confirm the offered unit on quote
- Testing
- Include your testing requirements in the RFQ
- Lead time
- Confirm with quantity and destination
Technical references
These references support the product specifications. Check the label and required series when selecting a replacement.
- Rockwell Automation — 1747-L551
SLC 500 System Selection Guide, 1747-SG001E-EN-E, February 2013, printed pages 69–70 (PDF 71–72), processor families and catalog-number specifications including Series C footnote. · Checked
Manufacturer design specifications for the exact catalog number. Read any stated series, temperature, voltage or shared-power condition with the value. Supplied hardware series, condition, testing and included items are confirmed separately on the quote.
Before we quote this part
Actual photos when available
Nameplate, condition, and visible wear can be shared before quote when stock photos are not enough.
Test notes for used units
Power-on or function test status is stated when available, with clear condition grading.
Trackable global shipping
DHL, FedEx, UPS, or forwarder options can be quoted with packing photos and tracking details.
Clear DOA boundary
For tested units, quote terms can include 7-day DOA support unless otherwise stated.
Independent sourcing disclaimer
We are not an authorized distributor, reseller, or representative of Siemens, Mitsubishi, Omron, or other manufacturers listed on this site. All product names, trademarks, brands, and logos are the property of their respective owners. Products may be used, refurbished, surplus, or sourced from the secondary market unless otherwise stated.
Need 1747-L551 availability?
Prices and stock can change. Submit quantity, required condition, and destination for a current quote.
FAQ
How do I buy 1747-L551?
Submit a Request for Quote on this page with quantity, required condition, and ship-to country. We respond by email with pricing and delivery options.
What condition options are available for 1747-L551?
You can request New, Never Used, Refurbished, Used, and For Parts / Repair for 1747-L551. We confirm the offered condition and current supply on your quote. See our condition guide at https://www.usedautomations.com/condition-codes.