| Article number | 6ES7321-1EL00-0AA0 | 6ES7321-1FF01-0AA0 | 6ES7321-1FF10-0AA0 |
| SM321, 32DI, AC120V | SM321, 8DI, AC120/230V | SM321, 8 DI, AC/DC 120/230V, 1ch/common |
| Load voltage L1 |
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● Rated value (AC) | 120 V | 230 V; 120/230 V AC | 230 V; 120/230 V AC; all load voltages must have the same phase. |
| Input current |
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| from backplane bus 5 V DC, max. | 16 mA | 29 mA | 100 mA |
| Power loss |
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| Power loss, typ. | 4 W | 4.9 W | 4.9 W |
| Digital inputs |
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| Number of digital inputs | 32 | 8 | 8 |
| Input characteristic curve in accordance with IEC 61131, type 1 |
| Yes | Yes |
| Input characteristic curve in accordance with IEC 61131, type 2 | Yes |
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| horizontal installation |
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— up to 40 °C, max. | 32 |
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— up to 60 °C, max. | 24 | 8 | 8 |
| vertical installation |
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— up to 40 °C, max. | 32 | 8 | 8 |
| Input voltage |
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● Type of input voltage | AC | AC | AC |
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● Rated value (AC) | 120 V; 47 … 63 Hz | 230 V; 120/230 V AC (47 … 63 Hz) | 120 V; 120/230 V AC (47 … 63 Hz) |
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● for signal “0” | 0 to 20V | 0 to 40V | 0 to 40V |
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● for signal “1” | 74 to 132V | 79 to 264V | 79 to 264V |
| Input current |
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● for signal “1”, typ. | 21 mA | 6.5 mA; (120 V); 11 mA (230 V) | 7.5 mA; (120 V); 17.3 mA (230 V) |
| Input delay (for rated value of input voltage) |
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| for standard inputs |
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— parameterizable | No | No | No |
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— at “0” to “1”, max. | 15 ms | 25 ms | 25 ms |
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— at “1” to “0”, max. | 25 ms | 25 ms | 25 ms |
| Cable length |
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● shielded, max. | 1 000 m | 1 000 m | 1 000 m |
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● unshielded, max. | 600 m | 600 m | 600 m |
| Encoder |
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| Connectable encoders |
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● 2-wire sensor | Yes | Yes | Yes |
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— permissible quiescent current (2-wire sensor), max. | 4 mA | 2 mA | 2 mA |
| Interrupts/diagnostics/status information |
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| Alarms | No | No | No |
| Diagnostics function | No | No | No |
| Alarms |
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● Diagnostic alarm | No | No | No |
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● Hardware interrupt | No | No | No |
| Diagnostics indication LED |
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● Group error SF (red) | No | No | No |
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● Status indicator digital input (green) | Yes; per channel | Yes | Yes |
| Potential separation |
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| Potential separation digital inputs |
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● between the channels | No | No | Yes |
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● between the channels, in groups of | 8 | 2 | 1 |
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● between the channels and backplane bus | Yes; Optocoupler | Yes; Optocoupler | Yes; Optocoupler |
| Isolation |
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| Isolation tested with | 2 500 V DC | 4 000 V DC | 1 500 V AC |
| Connection method |
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| required front connector | 40-pin | 20-pin | 40-pin |
| Dimensions |
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| Width | 40 mm | 40 mm | 40 mm |
| Height | 125 mm | 125 mm | 125 mm |
| Depth | 120 mm | 120 mm | 120 mm |
| Weights |
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| Weight, approx. | 300 g | 240 g | 240 g |
