Siemens Simatic S7-400 - Manual (Page 177)

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