
Digital modules
4.7 Digital input module SM 421; DI 32 x DC 24 V (6ES7421-1BL01-0AA0)
S7-400 Automation System Module Data
108 Reference Manual, Edition 09/2009, A5E00850736-06
Specifications of the SM 421; DI 32 x DC 24 V
Dimensions and weight
Dimensions W x H x D (mm) 25 x 290 x 210
Weight Approx. 500 g
Module-specific data
Number of inputs 32
Cable length
Unshielded
Max. 600 m
Shielded
Max. 1000 m
Voltages, currents, electrical potentials
Nominal electronics supply voltage L + Not required
Number of simultaneously controlled inputs 32
Electrical isolation
Between channels and the backplane bus
Yes
Between channels
No
Permissible potential difference
Between different circuits
75 VDC / 60 VAC
Isolation test voltage
Channels against backplane bus and load voltage
L +
500 VDC
Current consumption
From the backplane bus (5 V)
Max. 20 mA
Power loss of the module Typ. 6 W
Status, interrupts, diagnostics
Status display Green LED per channel
Interrupts None
Diagnostic functions None
Injection of substitution values No
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