Siemens SIMATIC S7-400 Reference Manual page 111

Number of inputs
Cable length
● Unshielded
● Shielded
Number of simultaneously controlled inputs
Electrical isolation
● Between channels and the backplane bus
● Between channels
Permissible potential difference
● Between Minternal and the inputs
● Between inputs of different groups
Isolation test voltage
Current consumption
● From the backplane bus (5 V)
Power loss of the module
Status display
Interrupts
Diagnostic functions
Input voltage
● Nominal value
● For "1" signal
● For "0" signal
● Frequency band
Input current
● With "1" signal
● With "0" signal
Input delay
● At "0" to "1" transitions
● With "1" to "0"
Input characteristics
Connection of 2-wire BEROs
● Permissible quiescent current
S7-400 Automation System Module Data
Reference Manual, Ausgabe 11/2016, A5E00850736-08
4.9 Digital input module SM 421; DI 16 x AC 120 V (6ES7421-5EH00-0AA0)
In groups of
Voltages, currents, electrical potentials
Status, interrupts, diagnostics
Sensor selection data
16
600 m
1000 m
16
Yes
Yes
1
120 VAC
250 VAC
1500 VAC
Max. 100 mA
Typ. 3.0 W
Green LED per channel
None
None
120 V
72 to 132 VAC
0 to 20 V
47 to 63 Hz
6 to 20 mA
0 to 4 mA
2 to 15 ms
5 to 25 ms
In accordance with IEC 61131; type 2
Supported
Max. 4 mA
Digital modules
111