| Item condition | New |
| Manufacture name | SIMATIC S7-400 SM 421, DI 16x120/230 V UC |
| Brand | Siemens |
| Categories |
PLC Units & I/O Modules
|
| Country of origin | DE |
| Harmonized System Code | 8538 9091 00 |
| Number of digital inputs | 16 |
| Number of digital outputs | 0 |
| Voltage type of supply voltage | DC |
| Output current | 0 A |
| Type of digital output | None |
| Type of electric connection | Screw-/spring clamp connection |
| Digital inputs configurable | Yes |
| Digital outputs configurable | No |
| Packing level 1 | 4025515128908 |
| Width | 25 mm |
| Height | 290 mm |
| Depth | 210 mm |
| Input current at signal 1 | 10 mA |
| Suitable for safety functions | No |
| Time delay at signal exchange | 15-20 ms |
| Type of voltage (input voltage) | AC/DC |
| Redundancy | Yes |
| Short-circuit protection, outputs available | No |
| Explosion safety category for gas | ATEX gas-ex-protection, Cat. 3G |
| Explosion safety category for dust | None |
| Appendant operation agent (Ex ia) | No |
| Appendant operation agent (Ex ib) | No |
| Permitted voltage at input | 0-264 V |