Nameplate

CatalogueAllen-Bradley → SLC 500 analog I/O (1746)

Allen-Bradley SLC 500 analog I/O (1746)

13 part numbers · PLC I/O module

Part number format ^1746-[A-Z]{2,3}[0-9]{1,2}[A-Z]{0,2}$
Also branded AB, A-B, Allen Bradley, Allen-Bradley, Rockwell, Rockwell Automation

Every part number in this family

What changes the value in this family

Series letter

Series letter on the label. Later series are not always backward compatible and sell for more.

Printed on the label, usually right after the catalogue number, as "SER A".

Tested or untested

Tested / as-is / new-in-box. The single biggest multiplier on used price.

Not on the plate. It comes from whoever pulled the unit, and it moves the price more than anything printed.