Siemens Simatic S7-400 - Manual (Page 165)

Digital Modules
4-43
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Technical Specifications of the SM 421; DI 16 120 VAC
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
Number of inputs that can be
triggered simultaneously 16
Isolation
•
Between channels and
backplane bus Yes
•
Between the channels Yes
– In groups of 1
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. 0.1 A
Power dissipation of the
module Typ. 3.0 W
Status, Interrupts, Diagnostics
Status display Green LED per
channel
Interrupts None
Diagnostic functions None
Sensor Selection Data
Input voltage
•
Rated value
•
For signal “1”
•
For signal “0”
•
Frequency range
120 V
72 to 132 VAC
0 to 20 V
47 to 63 Hz
Input current
•
At signal “1”
•
At signal “0”
6 to 20 mA
0 to 4 mA
Input delay
•
At “0” to “1”
•
At “1” to “0”
2 to 15 ms
5 to 25 ms
Input characteristic curve To IEC 61131; type 2
Connection of two-wire BEROs
•
Permitted bias current
Possible
Max. 4 A