Siemens SIMATIC S7-400 Reference Manual page 99

Number of inputs
Cable length
● unshielded
● shielded
Rated supply voltage of electronics L+
Number of inputs that can be enabled simultaneously 32
Electrical isolation
● Between channels and backplane bus
● Between channels
Permissible potential difference
● Between different circuits
Insulation tested at
● Channels to backplane bus and load voltage L+
Current consumption
● from backplane bus (5 V)
Module power loss
Status display
Interrupts
Diagnostic functions
Substitute values can be connected
Input voltage
● Rated value
● For "1" signal
● For "0" signal
Input current
● For "1" signal
Input delay
● For "0" to "1"
● For "1" to "0"
Input characteristic
Connection of 2-wire BEROs
● Permissible quiescent current
S7-400 Automation System Module Data
Reference Manual, Ausgabe 11/2016, A5E00850736-08
4.7 Digital input module SM 421; DI 32 x DC 24 V (6ES7421-1BL01-0AA0)
Voltage, current and potential
Status, interrupts, diagnostics
Data for selecting a sensor
32
Maximum 600 m
max. 1000 m
Not required
Yes
No
60 V DC/30 V AC (SELV)
500 Vac or 707 Vdc (type test)
20 mA maximum
Typ. 6 W
Green LED per channel
None
None
No
24 V DC
13 to 30 V
-30 to 5 V
7 mA
1.2 to 4.8 ms
1.2 to 4.8 ms
In accordance with IEC 61131-2; type 1
Possible
Maximum 1.5 mA
Digital modules
99