Product data
SIMATIC S7-400, digital input SM 421, isolated 32 DI; 24 V DC
Main & Complementary
|
Input current
|
|
from backplane bus 5 V DC, max.
|
20 mA
|
|
Power loss
|
|
Power loss, typ
|
6 W
|
|
Digital inputs
|
|
Number of digital inputs
|
32
|
|
Number of simultaneously controllable inputs
|
|
● Number of simultaneously controllable inputs
|
32
|
|
Input voltage
|
|
● Type of input voltage
|
DC
|
|
● Rated value (DC)
|
24 V
|
|
● for signal "0"
|
-30 V DC to +5 V DC
|
|
● for signal "1"
|
13 V DC to 30 V DC
|
|
Input current
|
|
● for signal "0", max. (permissible quiescent current)
|
1.3 mA
|
|
● for signal "1", typ.
|
7 mA
|
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