Siemens 6ES7421-1FH20-0AA0 — now in phase-out and being discontinued, supplied from remaining surplus and broker stock.
| Parameter | Value |
|---|---|
| Number of digital inputs | 16 |
| 2-wire sensor support | Yes |
| Parameter | Value |
|---|---|
| Input voltage at signal "1" | 74 to 264 V AC; 80 to 264 V DC, -80 to -264 V |
| Input voltage type (AC/DC) | AC/DC |
| Input voltage at signal "0" | 0 to 40 V AC/ -40 to +40 V DC |
| Input current at signal "1" (typ.) | 10 mA; at 120 V: 10 mA AC, 1.8 mA DC; at 230 V: 14 mA AC, 2 mA DC |
| Input current at signal "0", max. (permissible quiescent current) | 6 mA; AC: 6 mA; DC: 2 mA |
| Power loss (typ.) | 12 W |
| Current consumption from backplane bus (5 V DC), max. | 80 mA |
| Permissible quiescent current, 2-wire sensor, max. | 5 mA; AC: 5 mA |
| Cable length, unshielded, max. | 600 m |
| Cable length, shielded, max. | 1 000 m |
| Parameter | Value |
|---|---|
| Input delay 0 to 1, max. | 20 ms; AC: 20 ms; DC: 15 ms |
| Input delay 1 to 0, max. | 30 ms; AC: 30 ms; DC: 25 ms |
| Parameter | Value |
|---|---|
| Diagnostics function | No |
| Isolation between channels | Yes |
| Isolation between channels and backplane bus | Yes |
| Isolation test voltage | 1 500 V AC |
| Channels per isolated group | 4 |
| Status indicator per channel (green) | Yes |
| Parameter | Value |
|---|---|
| Depth | 210 mm |
| Height | 290 mm |
| Width | 25 mm |
The 6ES7421-1FH20-0AA0 is a Siemens SM 421 digital input module for the S7-400 rack, providing 16 isolated inputs that accept UC 120/230 V (47...63 Hz) and comply with IEC 1131-2 Type 2. It draws 12.0 W from the backplane and fits a 25 mm wide slot, with a signal threshold of 74 to 264 V AC or 80 to 264 V DC for the 1-signal.
Remaining units are available through surplus and broker channels.
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