| Manufacturer | Siemens |
| Category | SIMATIC S7-400 (Legacy Range) |
| SKU / Product code | 6ES7421-1FH20-0AA0 |
| Weight | 0.778 kg |
| Country of origin | DE |
| Commodity code | 85389091 |
| Description | SIMATIC S7-400, DIG.INPUT MOD. SM 421, OPTIC. ISOLATED, 16 DI, 120/230V UC INPUTS PER IEC1131-2 TYPE 2 |
