| Manufacturer part number (MPN) | 6ES7521-1FH00-0AA0 |
| EAN / GTIN | 4025515080244 |
| Sales unit | pcs |
| Number of digital inputs | 16 |
| Digital inputs configurable | Yes |
| Digital outputs configurable | Yes |
| Input current at signal 1 | 11 mA |
| Permitted voltage at input | 0–264 V |
| Type of voltage (input voltage) | AC |
| Type of digital output | None |
| Short-circuit protection, outputs available | No |
| Redundancy | No |
| Type of electric connection | Plug-in connection |
| Time delay at signal change | 25 ms |
| Suitable for safety functions | No |
| Appendant operation agent (Ex ia) | No |
| Explosion safety category for gas | ATEX gas-ex-protection, Cat. 3G |
| Explosion safety category for dust | None |
| Width | 35 mm |
| Height | 147 mm |
| Depth | 129 mm |
| Country of origin | Germany |