Siemens Simatic S7-400 - Manual (Page 180)

Digital Modules
4-58
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Technical Specifications of the SM 421; DI 32 120 VUC
Dimensions and Weight
Dimensions W H D (mm) 25 290 210
Weight Approx. 600 g
Data for Specific Module
Number of inputs 32
Length of cable
•
Unshielded
•
Shielded
600 m
1000 m
Voltages, Currents, Potentials
Rated load voltage L+ 79 to 132 VAC
80 to 132 VDC
•
Reverse polarity protection Yes
Number of inputs that can be
triggered simultaneously 32
Isolation
•
Between channels and
backplane bus Yes
•
Between the channels Yes
– In groups of 8
Permitted potential difference
•
Between M
internal
and the
inputs
120 VAC
•
Between the inputs of the
different groups 250 VAC
Insulation tested with 1500 VAC
Current consumption
•
From the backplane bus Max. 0.2 A
Power dissipation of the
module Typ. 6.5 W
Status, Interrupts, Diagnostics
Status display Green LED per
channel
Interrupts None
Diagnostic functions None
Data for Selecting a Sensor
Input voltage
•
Rated value
•
For signal “1”
•
For signal “0”
120 VUC
79 to 132 VAC
80 VDC to 132 VDC
0 to 20 V
•
Frequency range 47 to 63 Hz
Input current
•
At signal “1”
•
At signal “0”
2 mA to 5 mA
0 to 1 mA
Input delay
•
At “0” to “1”
•
At “1” to “0”
5 to 25 ms
5 to 25 ms
Input characteristic curve To IEC 61131; type 1
Connection of two-wire BEROs
•
Permitted bias current
Possible
Max.1 mA