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SM 421 digital input module Parts
Compare SM 421 digital input module
Key specifications of the parts listed on this page, taken from the manufacturer's data sheets.
| MPN | from backplane bus 5 V DC, max. | Input characteristic according to IEC 61131 | Input voltage — for signal "0" | Connectable encoders — 2-wire sensor — permissible quiescent current (2-wire sensor), max. | Potential separation digital inputs — between the channels, in groups of |
|---|---|---|---|---|---|
| 6ES7421-7DH00-0AB0 | 150 mA | similar to IEC 61131-2 | -6 to +6 V DC/ 0 to 5 V AC | 0.5 mA; 0.5 to 2 mA | 1 |
| 6ES7421-7BH01-0AB0 | 130 mA | Type 2 | -30 V DC to +5 V DC | 3 mA | 8 |
| 6ES7421-1FH20-0AA0 | 80 mA | Type 2 | 0 to 40 V AC/ -40 to +40 V DC | 5 mA; AC: 5 mA | 4 |
Common to all listed parts
| Number of digital inputs | 16 |
| Number of simultaneously controllable inputs — Number of simultaneously controllable inputs | 16 |
| Connectable encoders — 2-wire sensor | Yes |
| Diagnostics indication LED — Status indicator digital input (green) | Yes |
| Potential separation digital inputs — between the channels | Yes |
| Potential separation digital inputs — between the channels and backplane bus | Yes |
| Width | 25 mm |
| Height | 290 mm |