| SIMATIC S7-300, DIGITAL INPUT SM 321, OPTICALLY ISOLATED 16DI, 24 V DC, SOURCE INPUT, 1 X 20 PIN |
|
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 |
Input current |
from backplane bus 5 V DC, max. | 10 mA |
Power losses |
Power loss, typ. | 3.5 W |
Digital inputs |
Number/binary inputs | 16 |
Input characteristic curve acc. to IEC 61131, Type 1 | 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" | -5 to +30 V |
for signal "1" | -13 to -30 V |
Input current |
for signal "1", typ. | 7 mA |
Input delay (for rated value of input voltage) |
for standard inputs |
Parameterizable | No |
at "0" to "1", min. | 1.2 ms |
at "0" to "1", max. | 4.8 ms |
Cable length |
Cable length, shielded, max. | 1000 m |
Cable length unshielded, max. | 600 m |
Encoder |
Connectable encoders |
2-wire sensor | Yes |
Permissible quiescent current (2-wire sensor), max. | 1.5 mA |
Isochronous mode |
Isochronous operation (application synchronized up to terminal) | No |
Interrupts/diagnostics/status information |
Alarms |
Alarms | No |
Diagnostic alarm | No |
Hardware interrupt | No |
Diagnostic messages |
Diagnostic functions | No |
Diagnostics indication LED |
Status indicator digital input (green) | Yes |
Galvanic isolation |
Galvanic isolation digital inputs |
between the channels | No |
between the channels, in groups of | 16 |
between the channels and the backplane bus | Yes; Optocoupler |
Permissible potential difference |
between different circuits | 75 VDC / 60 VAC |
Isolation |
Isolation checked with | 500 V DC |
Connection method |
required front connector | 20-pin |
Dimensions |
Width | 40 mm |
Height | 125 mm |
Depth | 120 mm |
Weight |
Weight, approx. | 200 g |
Status | Mar 12, 2012 |