Siemens SIMATIC S7-400 Reference Manual page 121
Automation system module
data
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Cable length
● Unshielded
● Shielded
Number of simultaneously controlled inputs
Electrical isolation
● Between channels and the backplane bus
● Between channels
Permissible potential difference
● between M
● Between inputs of different groups
Insulation resistance
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
4.11 Digital input module SM 421; DI 16 x UC 120/230 V (6ES7 421-1FH00-0AA0)
In groups of
and inputs
internal
600 m
1000 m
Voltages, currents, electrical potentials
16 at 120 V
8 at 240 V
16 with fan subassembly
Yes
Yes
4
230 VAC
500 VAC
4000 VAC
Max. 100 mA
Typ. 3.5 W
Status, interrupts, diagnostics
Green LED per channel
None
None
Sensor selection data
120/230 VUC
79 to 264 V AC
80 to 264 V DC
0 to 48 V UC
47 to 63 Hz
2 to 5 mA
0 to 1 mA
5 to 25 ms
5 to 25 ms
In accordance with IEC 61131-2; Type 1
Supported
Max. 1 mA
Digital modules
121
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