Catalogue → Siemens → SIMATIC S7-300 signal module
6ES7321-1BL00-0AA0
Siemens · PLC I/O module · SIMATIC S7-300 signal module confirmed
| Manufacturer | Siemens (also SIMATIC, SINAMICS) |
|---|---|
| Family | SIMATIC S7-300 signal module |
| Category | PLC I/O module |
| Without separators | 6ES73211BL000AA0 |
| Notes | SM321 32x24VDC input; verified: distributor catalogue listings |
What changes what this is worth
Same catalogue number, different money. These are the attributes that separate two otherwise identical 6ES7321-1BL00-0AA0 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.