Digital Modules
3-39
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Technical specifications of the SM 321; DI 16 x 48-125 VDC
Dimensions and Weight
Dimensions W x H x D
(in millimeters)
40 x125 x120
Weight Approx. 200 g
Data for Specific Module
Supports clocked
operation
No
Number of inputs 16
Length of cable
• Unshielded
• Shielded
max. 600 m
max. 1000 m
Voltages, Currents, Potentials
Number of inputs that can be
triggered simultaneously at U
E
Up to 60 V
Up to 146 V
• Horizontal installation
Up to 50 C
Up to 60 C
88
86
• Vertical configuration
Up to 40 C 88
Isolation
• Between channels and
backplane bus
Yes
• Between the channels
In groups of
Yes
8
Permiss. potential differences
• Between the different
circuits
146 VDC / 132 VAC
Insulation tested with 1500 VDC
Current consumption
• From the backplane bus max. 40 mA
Power dissipation of the module typ. 4.3 W
Status, Interrupts, Diagnostics
Status display Green LED per channel
Interrupts None
Diagnostic functions None
Sensor Selection Data
Input voltage
• Rated value 48 VDC to
125 VDC
• For signal “1” 30 V to 146 V
• For signal “0” –146 V to 15 V
Input current
• At signal “1” typ. 3.5 mA
Input delay
• From “ 0” to “1”
• At “1” to “0”
0.1 ms to 3.5 ms
0.7 ms to 3.0 ms
Input characteristic curve According to
IEC 61131, type 1
Connection of Two-Wire
BEROs
• Permitted bias current
Possible
max. 1 mA
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