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 Minternal 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