| SIMATIC S7-300, DIGITAL INPUT SM 321, OPTICALLY ISOLATED, 16 DI, DC 24V, 20 PIN, PROCESS INTERRUPT, DIAGNOSTICS |
|
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 load voltage L+ (without load), max. | 40 mA |
from backplane bus 5 V DC, max. | 55 mA |
Power losses |
Power loss, typ. | 4 W |
Digital inputs |
Number/binary inputs | 16 |
Number of simultaneously controllable inputs |
all mounting positions |
up to 40 °C, max. | 16 |
up to 60 °C, max. | 16 |
Input voltage |
Rated value, DC | 24 V |
for signal "0" | -30 to +5 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 | Yes; 0.1 / 0.5 / 3 / 15 / 20 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 |
Interrupts/diagnostics/status information |
Alarms |
Diagnostic alarm | Yes |
Hardware interrupt | Yes |
Diagnostic messages |
Diagnostics | Yes; internal/ external fault |
Galvanic isolation |
Galvanic isolation digital inputs |
between the channels, in groups of | 16 |
between the channels and the backplane bus | Yes; Optocoupler |
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 |