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SIMATIC S7-400, DIGITAL INPUT SM 421, OPTIC. ISOLATED, 16 DI, 120 V AC, WITH 1 COMMON POINT |
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Supply voltage |
Load voltage L1 |
Rated value (AC) |
120 V |
permissible range, lower limit (AC) |
74 V |
permissible range, upper limit (AC) |
132 V |
Input current |
from backplane bus 5 V DC, max. |
100 mA |
Power losses |
Power loss, max. |
20 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 |
Rated value, AC |
120 V |
for signal "0" |
0 to 20 V AC |
for signal "1" |
74 to 132 V AC |
Frequency range |
47 bis 63 Hz |
Input current |
for signal "0", max. (permissible quiescent current) |
4 mA; 0 to 4 mA |
for signal "1", typ. |
6 mA; 6 to 20 mA |
Input delay (for rated value of input voltage) |
for standard inputs |
Parameterizable |
Yes |
at "0" to "1", min. |
2 ms |
at "0" to "1", max. |
15 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. |
4 mA |
Galvanic isolation |
Galvanic isolation digital inputs |
between the channels, in groups of |
1 |
between the channels and the backplane bus |
Yes |
Isolation |
Isolation checked with |
1500 V AC |
Dimensions |
Width |
25 mm |
Height |
290 mm |
Depth |
210 mm |
Weights |
Weight, approx. |
650 g |
Status |
Jun 6, 2014 |
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