
Digital Modules
4-55
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Technical Specifications of the SM 421; DI 16 x 120/230 VUC
Dimensions and Weight
Dimensions W H D
(in millimeters)
25 290 210
Weight Approx. 650 g
Data for Specific Module
Number of inputs 16
Length of cable
• Unshielded
• Shielded
600 m
1000 m
Voltages, Currents, Potentials
Power rated voltage of the
electronics L+
None
Number of inputs
that can be triggered
simultaneously
16
Isolation
• Between channels and
backplane bus
Yes
• Between the channels Yes
– In groups of 4
Permitted potential difference
• Between M
internal
and the
inputs
250 VAC
• Between the inputs of the
different groups
500 VAC
Insulation resistance 4000 VAC
Current consumption
• From the backplane bus Max. 80 mA
Power dissipation of the
module
Typ. 12 W
Status, Interrupts, Diagnostics
Status display Green LED per
channel
Interrupts None
Diagnostic functions None
Substitute value can be applied No
Data for Selecting a Sensor
Input voltage
• Rated value
• For signal “1”
120/230 VUC
74 to 264 VAC
80 to 264 VDC
–80 to –264 VDC
• For signal “0” 0 to 40 VAC
–40 to +40 VDC
Frequency range 47 to 63 Hz
Input current
• At signal ”1” (120 V) Typ. 10 mA AC
Typ. 1.8 mA DC
• At signal ”1” (230 V) Typ. 14 mA AC
Typ. 2 mA DC
• At signal “0” 0 to 6 mA AC
0 to 2 mA DC
Input delay
• At “0” to “1” Max. 20 ms AC
Max. 15 ms DC
• At “1” to “0” Max. 30 ms AC
Max. 25 ms DC
Input characteristic curve To IEC 61131;
type 2
Connection of two-wire BEROs
• Permitted bias current
Possible
Max. 5 mA AC
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