Siemens 6ES7321-1FF81-0AA0
MPN6ES7321-1FF81-0AA0
End of Life
SIMATIC S7-300, DIGITAL INPUT SM 321, OPTICALLY ISOLATED, FOR EXPANDED TEMPERATURE RANGE, 8 DI, 120V/230V AC, 20 PIN
$116.84Ref. price · indicative, final on quote
StockContact for availability
MOQ1 pcs
Sourced new & surplus through independent channelsListing updated Jun 2026
Specifications
Inputs
| Parameter | Value |
|---|---|
| Number of digital inputs | 8 |
| Max. inputs, up to 40 °C | 8 |
| Max. inputs, up to 60 °C | 8 |
| 2-wire sensor support | Yes |
Electrical
| Parameter | Value |
|---|---|
| Input voltage at signal "1" | 79 to 264V |
| Input voltage at signal "0" | 0 to 40V |
| Input current at signal "1" (typ.) | 6.5 mA; 6.5 mA (120 V); 11mA (230 V) |
| Power loss (typ.) | 4.9 W |
| Current consumption from backplane bus (5 V DC), max. | 29 mA |
| Permissible quiescent current, 2-wire sensor, max. | 2 mA |
| Cable length, unshielded, max. | 600 m |
| Cable length, shielded, max. | 1 000 m |
Timing
| Parameter | Value |
|---|---|
| Input delay 0 to 1, max. | 25 ms |
Diagnostics & Isolation
| Parameter | Value |
|---|---|
| Isolation between channels and backplane bus | Yes; Optocoupler |
| Isolation test voltage | 1 500 V AC |
| Channels per isolated group | 2 |
Mechanical
| Parameter | Value |
|---|---|
| Depth | 120 mm |
| Height | 125 mm |
| Width | 40 mm |
Specifications
| Parameter | Value |
|---|---|
| Rated value (AC) | 230 V; 120/230 V AC (47 ... 63 Hz) |
MPN
6ES7321-1FF81-0AA0