| Article number | 6ES7321-7BH01-0AB0 | 6ES7321-1CH00-0AA0 | 6ES7321-1CH20-0AA0 | 6ES7321-1FH00-0AA0 |
| SM321, 16DI, 24V DC | SM321, 16 DI, AC/DC 24-48V, 1ch/common | SM321, 16DI, DC48-125V | SM321, 16 DI, 120/230V AC |
| Supply voltage |
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| Load voltage L+ |
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● Rated value (DC) | 24 V | 24 V | 48 V |
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● permissible range, lower limit (DC) | 20.4 V | 24 V | 48 V |
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● permissible range, upper limit (DC) | 28.8 V | 48 V | 125 V |
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● Reverse polarity protection | Yes |
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| Load voltage L1 |
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● Rated value (AC) |
| 24 V |
| 230 V; 120/230 V AC; all load voltages must have the same phase. |
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● permissible range, lower limit (AC) |
| 24 V |
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● permissible range, upper limit (AC) |
| 48 V |
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| Input current |
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| from load voltage L+ (without load), max. | 90 mA |
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| from backplane bus 5 V DC, max. | 130 mA | 100 mA | 40 mA | 29 mA |
| Encoder supply |
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| Number of outputs | 2 |
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| Type of output voltage | L+ (-2.5 V) |
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| Short-circuit protection | Yes; Electronic |
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| additional (redundant) feed | Yes |
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| Output current |
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● Rated value | 120 mA |
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● permissible range, lower limit | 0 mA |
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● permissible range, upper limit | 150 mA |
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| Power loss |
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| Power loss, typ. | 4 W | 1.5 W; at 24 V; 2,8 W at 48 V | 4.3 W | 4.9 W |
| Digital inputs |
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| Number of digital inputs | 16 | 16 | 16 | 16 |
| Input characteristic curve in accordance with IEC 61131, type 1 |
| Yes | 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. | 16 | 16 | 8 | 16 |
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— up to 60 °C, max. | 16 | 16 | 8; 6 to Ue 146 V | 16 |
| vertical installation |
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— up to 40 °C, max. | 16 | 16 | 8 | 16 |
| Input voltage |
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● Type of input voltage | DC | AC/DC | DC | AC |
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● Rated value (DC) | 24 V | 24 V; DC 24 or 48 V | 48 V; 48 V DC to 125 V DC |
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● Rated value (AC) |
| 24 V; 24 V AC or 48 V AC (0 … 63 Hz) |
| 230 V; 120/230 V AC (47 … 63 Hz) |
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● for signal “0” | -30 to +5 V | -5V AC to +5V AC | -146 V DC to +15 V DC | 0 to 40V |
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● for signal “1” | 13 to 30V | 14V AC to 60V AC | 30 V DC to 146 V DC | 79 to 264V |
| Input current |
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● for signal “0”, min. |
| -1 mA |
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● for signal “0”, max. (permissible quiescent current) |
| 1 mA |
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● for signal “1”, typ. | 7 mA | 2.7 mA | 3.5 mA | 6.5 mA; (120 V, 60 Hz), 16 mA (230 V, 50 Hz) |
| Input delay (for rated value of input voltage) |
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| for standard inputs |
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— parameterizable | Yes; 0.1 / 0.5 / 3 / 15 / 20 ms | No | No | No |
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— at “0” to “1”, min. |
| 16 ms | 0.1 ms | 25 ms |
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— at “0” to “1”, max. |
| 16 ms | 3.5 ms | 25 ms |
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— at “1” to “0”, min. |
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| 0.7 ms |
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— at “1” to “0”, max. |
| 16 ms | 3 ms | 25 ms |
| Encoder connection |
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● Fixed current limitation for wire-break monitoring, min. | 10 kΩ |
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● Fixed current limitation for wire-break monitoring, max. | 18 kΩ |
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| Cable length |
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● shielded, max. | 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 |
| Encoder |
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| Connectable encoders |
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● 2-wire sensor | Yes | Yes | Yes | Yes |
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— permissible quiescent current (2-wire sensor), max. | 2 mA | 1 mA | 1 mA | 2 mA |
| Interrupts/diagnostics/status information |
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| Alarms | Yes | No | No | No |
| Diagnostics function | Yes; Parameterizable | No | No | No |
| Alarms |
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● Diagnostic alarm | Yes; Parameterizable | No | No | No |
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● Hardware interrupt | Yes; Parameterizable | No | No | No |
| Diagnoses |
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● Diagnostic information readable | Yes |
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● Wire-break | Yes; to I< 1 mA |
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| Diagnostics indication LED |
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● Group error SF (red) | Yes | No | No | No |
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● Status indicator digital input (green) | Yes | Yes | Yes | Yes |
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● Encoder supply Vs (green) | Yes |
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| Potential separation |
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| Potential separation digital inputs |
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● between the channels | No | Yes | No | No |
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● between the channels, in groups of | 16 | 1 | 8 | 4 |
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● between the channels and backplane bus | Yes; Optocoupler | Yes; Optocoupler | Yes; Optocoupler | Yes; Optocoupler |
| Isolation |
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| Isolation tested with | 500 V DC | 1 500 V AC | 1 500 V DC | 4 000 V DC |
| Connection method |
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| required front connector | 20-pin | 40-pin | 20-pin | 20-pin |
| Dimensions |
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| Width | 40 mm | 40 mm | 40 mm | 40 mm |
| Height | 125 mm | 125 mm | 125 mm | 125 mm |
| Depth | 120 mm | 120 mm | 120 mm | 120 mm |
| Weights |
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| Weight, approx. | 200 g | 260 g | 200 g | 240 g |
