| Article number |
6ES7321-7BH01-0AB0
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SIMATIC S7-300, Digital input SM 321, isolated, 16 DI; 24 V DC, 1x 20-pole, process interrupt, diagnostics, suitable for isochronous mode |
| Supply voltage |
| Load voltage L+ |
| ● Rated value (DC) |
24 V |
| ● permissible range, lower limit (DC) |
20.4 V |
| ● permissible range, upper limit (DC) |
28.8 V |
| ● Reverse polarity protection |
Yes |
| Input current |
| from load voltage L+ (without load), max. |
90 mA |
| from backplane bus 5 V DC, max. |
130 mA |
| Encoder supply |
| Number of outputs |
2 |
| Type of output voltage |
L+ (-2.5 V) |
| Short-circuit protection |
Yes; Electronic |
| additional (redundant) feed |
Yes |
| Output current |
| ● Rated value |
120 mA |
| ● permissible range, lower limit |
0 mA |
| ● permissible range, upper limit |
150 mA |
| Power loss |
| Power loss, typ. |
4 W |
| Digital inputs |
| Number of digital inputs |
16 |
| Input characteristic curve in accordance with IEC 61131, type 2 |
Yes |
| Number of simultaneously controllable inputs |
| horizontal installation |
| — up to 40 °C, max. |
16 |
| — up to 60 °C, max. |
16 |
| vertical installation |
| — up to 40 °C, max. |
16 |
| Input voltage |
| ● Type of input voltage |
DC |
| ● Rated value (DC) |
24 V |
| ● for signal "0" |
-30 to +5 V |
| ● for signal "1" |
13 to 30V |
| Input current |
| ● for signal "1", typ. |
7 mA |
| Input delay (for rated value of input voltage) |
| for standard inputs |
| — parameterizable |
Yes; 0.1 / 0.5 / 3 / 15 / 20 ms |
| Encoder connection |
| ● Fixed current limitation for wire-break monitoring, min. |
10 kΩ |
| ● Fixed current limitation for wire-break monitoring, max. |
18 kΩ |
| Cable length |
| ● shielded, max. |
1 000 m |
| ● unshielded, max. |
600 m |
| Encoder |
| Connectable encoders |
| ● 2-wire sensor |
Yes |
| — permissible quiescent current (2-wire sensor), max. |
2 mA |
| Interrupts/diagnostics/status information |
| Alarms |
Yes |
| Diagnostics function |
Yes; Parameterizable |
| Alarms |
| ● Diagnostic alarm |
Yes; Parameterizable |
| ● Hardware interrupt |
Yes; Parameterizable |
| Diagnoses |
| ● Diagnostic information readable |
Yes |
| ● Wire-break |
Yes; to I< 1 mA |
| Diagnostics indication LED |
| ● Group error SF (red) |
Yes |
| ● Status indicator digital input (green) |
Yes |
| ● Encoder supply Vs (green) |
Yes |
| Potential separation |
| Potential separation digital inputs |
| ● between the channels |
No |
| ● between the channels, in groups of |
16 |
| ● between the channels and backplane bus |
Yes; Optocoupler |
| Isolation |
| Isolation tested with |
500 V DC |
| connection method |
| required front connector |
20-pin |
| Dimensions |
| Width |
40 mm |
| Height |
125 mm |
| Depth |
120 mm |
| Weights |
| Weight, approx. |
200 g |