
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
136 Reference Manual, Edition 09/2009, A5E00850736-06
Specifications of the SM 421; DI 16 x UC 120/230 V
Dimensions and weight
Dimensions W x H x D (mm) 25 x 290 x 210
Weight Approx. 650 g
Module-specific data
Number of inputs 16
Cable length
Unshielded
600 m
Shielded
1000 m
Voltages, currents, electrical potentials
Nominal electronics supply voltage L + None
Number of simultaneously controlled inputs 16
Electrical isolation
Between channels and the backplane bus
Yes
Between channels
In groups of
Yes
4
Permissible potential difference
between M
internal
and inputs
250 VAC
Between the inputs of the different groups
500 VAC
Insulation resistance 4000 VAC
Current consumption
From the backplane bus (5 V)
Max. 80 mA
Power loss of the module Typ. 12 W
Status, interrupts, diagnostics
Status display Green LED per channel
Interrupts None
Diagnostic functions None
Injection of substitution values No
Sensor selection data
Input voltage
Nominal value
120/230 VUC
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 band 47 to 63 Hz
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