Find a replacement by catalog number
Allen-Bradley SLC 500 Parts: 1746 and 1747 Models
Find the exact 1746 or 1747 part for an existing SLC 500 installation. This range includes SLC 5/04 and 5/05 processors, relay and transistor I/O, an RTD module, chassis power supplies and Remote I/O components. Match the part's role, hardware series and project configuration when preparing a replacement enquiry.
Before choosing a replacement
Keep processor memory and network distinct
1747-L543 is an SLC 5/04 with DH+ and RS-232. The L551, L552 and L553 are SLC 5/05 processors with Ethernet and RS-232 and 16 K, 32 K or 64 K words respectively. The guide's 100 Mbit/s capability applies to Series C; confirm the offered series and firmware.
Match I/O type and loading
OW16 and OX8 use relay contacts; OB32 uses sourcing transistor outputs. IV16 is a sourcing DC input, IM16 is an AC input, and NR8 measures RTD or resistance signals. Apply voltage, per-point, common-group and module limits together.
Check chassis contents and power budget
The A10 article identifies a 10-slot chassis. Processors, I/O, power supplies and interconnect cables are selected separately. P4 backplane and user outputs share a 70 W total limit. Preserve a P2 Series C requirement from the installed or requested label.
Identify the Remote I/O role
ASB is a Remote I/O adapter; BSN provides scanner and processor-backup functions in a complementary pair. Confirm the scanner, addressing, partner hardware and application. A single part offer does not establish a complete redundant system.
Manufacturer reference: Rockwell Automation SLC 500 System Selection Guide, 1747-SG001E-EN-E. Model specifications and their manufacturer sources are linked on each product page. Reviewed 2026-09-13.
SLC 500 · 1746 / 1747 model list
1 documented model. Select a model for specifications and a quote request.
1747-L551
Allen-Bradley 1747-L551 16 K-word SLC 5/05 processor
What to include in your enquiry
Send the complete catalog number, quantity, destination, acceptable condition and required delivery date. Include the required hardware series, firmware and accessories if these matter to your installation. Condition, actual unit photos, test information, price and dispatch timing are confirmed for the quoted unit.
Read the used PLC parts buying guideWhat we verify before a quote
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.
Request SLC 500 · 1746 / 1747 parts
Send one model or a parts list with your requirements. Pricing and current supply details are confirmed on the quote.