Catalogue → Allen-Bradley → SLC 500 digital I/O (1746)
1746-IA4
Allen-Bradley · PLC I/O module · SLC 500 digital I/O (1746) confirmed
| Manufacturer | Allen-Bradley (also Rockwell Automation, AB) |
|---|---|
| Family | SLC 500 digital I/O (1746) |
| Category | PLC I/O module |
| Without separators | 1746IA4 |
| Notes | 4-point 120VAC input; verified: Rockwell 1747-SG001 SLC 500 selection guide |
What changes what this is worth
Same catalogue number, different money. These are the attributes that separate two otherwise identical 1746-IA4 units — check each one before you quote or bid.
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.