Siemens Simatic S7-400 - Page 111

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