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SIMATIC S7-400, DIGITAL INPUT SM 421, GALVANICALLY ISOLATED, 16 DI, 24V DC WITH 0.05 MS INPUT DELAY, ALARM, 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 backplane bus 5 V DC, max. |
130 mA |
from supply voltage L+, max. |
120 mA |
Power losses |
Power loss, max. |
5 W |
Digital inputs |
Number of digital inputs |
16 |
Number of simultaneously controllable inputs |
all mounting positions |
— up to 40 °C, max. |
16 |
— up to 60 °C, max. |
16 |
Input voltage |
● Type of input voltage |
DC |
● Rated value, DC |
24 V |
● for signal "0" |
-30 to +5 V DC |
● for signal "1" |
11 to 30 V DC |
Input current |
● for signal "1", typ. |
6 mA; 6 to 8 mA |
Input delay (for rated value of input voltage) |
for standard inputs |
— Parameterizable |
Yes |
— at "0" to "1", min. |
3 µs; 0.05 / 0.1 / 0.5 / 3 ms |
Cable length |
● Cable length, shielded, max. |
1 000 m; 1000 m/3 ms; 70 m/0.5 ms; 30 m/0.1 ms; 30 m/0.05 ms |
● Cable length unshielded, max. |
600 m; 600 m: 3 ms; 50 m: 0,5 ms; 20 m: 0,1 ms; 20 m: 0,05 ms |
Encoder |
Connectable encoders |
● 2-wire sensor |
Yes |
— Permissible quiescent current (2-wire sensor), max. |
3 mA |
Interrupts/diagnostics/status information |
Alarms |
● Diagnostic alarm |
Yes; Parameterizable |
● Hardware interrupt |
Yes; Parameterizable |
Diagnostic messages |
● Diagnostics |
Yes; internal/ external fault |
Galvanic isolation |
Galvanic isolation digital inputs |
● between the channels, in groups of |
8 |
● between the channels and the backplane bus |
Yes |
Isolation |
Isolation checked with |
500 V DC |
Dimensions |
Width |
25 mm |
Height |
290 mm |
Depth |
210 mm |
Weights |
Weight, approx. |
600 g |
last modified: |
25.09.2014 |