| Article number | 6ES7321-1BH02-0AA0 | 6ES7321-1BH50-0AA0 | 6ES7321-1BL00-0AA0 | 6ES7321-1BP00-0AA0 | 6ES7321-1BH10-0AA0 |
| SM321, 16DI, DC24V | SM321, 16DI, DC24V, Source Input | SM321, 32DI, DC24V | SM321, 64 DI, DC 24V, 3MS, P/M reading | SM321,16DI,DC24V, 0.05ms Input Delay. |
| Supply voltage |
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| Load voltage L+ |
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● Rated value (DC) | 24 V | 24 V | 24 V | 24 V | 24 V |
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● permissible range, lower limit (DC) | 20.4 V | 20.4 V | 20.4 V |
| 20.4 V |
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● permissible range, upper limit (DC) | 28.8 V | 28.8 V | 28.8 V |
| 28.8 V |
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● Reverse polarity protection |
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| Yes |
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| Input current |
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| from backplane bus 5 V DC, max. | 10 mA | 10 mA | 15 mA | 100 mA | 110 mA |
| Power loss |
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| Power loss, typ. | 3.5 W | 3.5 W | 6.5 W | 7 W | 3.8 W |
| Digital inputs |
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| Number of digital inputs | 16 | 16 | 32 | 64 | 16 |
| Input characteristic curve in accordance with IEC 61131, type 1 | Yes | Yes | Yes | Yes | Yes |
| Number of simultaneously controllable inputs |
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| all mounting positions |
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— up to 40 °C, max. |
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| 64 |
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— up to 60 °C, max. |
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| 32 |
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| horizontal installation |
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— up to 40 °C, max. | 16 | 16 | 32 | 64 | 16 |
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— up to 60 °C, max. | 16 | 16 | 16 | 32 | 16 |
| vertical installation |
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— up to 40 °C, max. | 16 | 16 | 32 | 32 | 16 |
| Input voltage |
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● Type of input voltage | DC | DC | DC | DC | DC |
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● Rated value (DC) | 24 V | 24 V | 24 V | 24 V | 24 V |
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● for signal “0” | -30 to +5 V | -5 to +30V | -30 to +5 V | -30 to +5 V | -30 to +5 V |
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● for signal “1” | 13 to 30V | -13 to -30V | 13 to 30V | 13 to 30V | 13 to 30V |
| Input current |
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● for signal “1”, typ. | 7 mA | 7 mA | 7 mA | 4.2 mA | 7 mA |
| Input delay (for rated value of input voltage) |
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| for standard inputs |
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— parameterizable | No | No | No | No | No |
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— Rated value |
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| 4.2 ms |
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— at “0” to “1”, min. | 1.2 ms | 1.2 ms | 1.2 ms | 1.2 ms | 25 µs |
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— at “0” to “1”, max. | 4.8 ms | 4.8 ms | 4.8 ms | 4.8 ms | 75 µs |
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— at “1” to “0”, min. | 1.2 ms | 1.2 ms | 1.2 ms | 1.2 ms | 25 µs |
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— at “1” to “0”, max. | 4.8 ms | 4.8 ms | 4.8 ms | 4.8 ms | 75 µs |
| Cable length |
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● shielded, max. | 1 000 m | 1 000 m | 1 000 m | 1 000 m | 1 000 m |
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● unshielded, max. | 600 m | 600 m | 600 m | 600 m | 600 m |
| Encoder |
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| Connectable encoders |
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● 2-wire sensor | Yes | Yes | Yes | No | Yes |
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— permissible quiescent current (2-wire sensor), max. | 1.5 mA | 1.5 mA | 1.5 mA |
| 1.5 mA |
| Interrupts/diagnostics/status information |
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| Alarms | No | No | No | No | No |
| Diagnostics function | No | No | No | No | No |
| Alarms |
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● Diagnostic alarm | No | No | No | No | No |
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● Hardware interrupt | No | No | No | No | No |
| Diagnoses |
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● Diagnostic information readable |
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| No |
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● Wire-break |
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| No |
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| Diagnostics indication LED |
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● Group error SF (red) |
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| No |
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● Status indicator digital input (green) | Yes | Yes | Yes | Yes | Yes |
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● Encoder supply Vs (green) |
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| No |
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| Potential separation |
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| Potential separation digital inputs |
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● between the channels | No | No | No | No | No |
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● between the channels, in groups of | 16 | 16 | 16 | 16 | 16 |
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● between the channels and backplane bus | Yes; Optocoupler | Yes; Optocoupler | Yes; Optocoupler | Yes; Optocoupler | Yes; Optocoupler |
| Isolation |
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| Isolation tested with | 500 V DC | 500 V DC | 500 V DC | 500 V DC | 500 V DC |
| Connection method |
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| required front connector | 20-pin | 20-pin | 40-pin | Cable: 6ES7392-4Bxx0-0AA0 terminal blocks: 6ES7392-1xN00-0AA0 | 20-pin |
| Dimensions |
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| Width | 40 mm | 40 mm | 40 mm | 40 mm | 40 mm |
| Height | 125 mm | 125 mm | 125 mm | 125 mm | 125 mm |
| Depth | 120 mm | 120 mm | 120 mm | 112 mm | 120 mm |
| Weights |
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| Weight, approx. | 200 g | 200 g | 260 g | 230 g | 200 g |
