● shielded
1000 m
Voltage, current and potential
Rated supply voltage of electronics L+ None
Number of inputs that can be enabled simultaneously 16
Electrical isolation
● Between channels and backplane bus
Yes
● Between channels
in groups of
Yes
4
Permissible potential difference
● Between M
intern
and the inputs
250 V AC (reinforced insulation)
Test voltage:
4000 Vac (type test)
2400 AC (routine test)
● Between inputs of different groups
500 V AC (basic insulation)
Test voltage:
2400 Vac (routine test)
2300 Vac (type test)
Current consumption
● From backplane bus (5 V)
Maximum 80 mA
Module power loss Typ. 12 W
Status, interrupts, diagnostics
Status display Green LED per channel
Interrupts None
Diagnostic functions None
Substitute values can be connected No
Data for selecting a sensor
Input voltage
● Rated value
UC 120/230 V
● For "1" signal
74 to 264 V AC
80 to 264 V DC
-80 to -264 V DC
● For "0" signal
0 to 40 V AC
-40 to +40 V DC
Frequency range 47 to 63 Hz
Input current
● For "1" signal (120 V)
Typ. 10 mA AC
Typ. 1.8 mA DC
● For "1" signal (230 V)
Typ. 14 mA AC
Typ. 2 mA DC
● For "0" signal
0 to 6 mA AC
0 to 2 mA DC
Input delay
● For "0" to "1"
Maximum 20 ms AC
Maximum 15 ms DC
Digital modules
4.12 Digital input module SM 421; DI 16 x UC 120/230 V (6ES7421-1FH20-0AA0)
S7-400 Automation System Module Data
124 Reference Manual, Ausgabe 11/2016, A5E00850736-08
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