Digital Modules
3-21
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Technical specifications of the SM 321; DI 16 x 24 VDC High Speed
Dimensions and Weight
Dimensions W x H x D
(in millimeters)
40 x 125 x 117
Weight Approx. 200 g
Data for Specific Module
Supports clocked
operation
Yes
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
• Horizontal configuration
Up to 60 C
• Vertical configuration
Up to 40 C
16
16
Isolation
• Between channels and
backplane bus
Yes
Permitted potential difference
• Between the different
circuits
75 VDC / 60 VAC
Insulation tested with 500 VDC
Current consumption
• From the backplane bus max. 110 mA
Power dissipation of the module typ. 3.8 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”
24 VDC
13 to 30 V
–30 to + 5 V
Input current
• At signal “1” typ. 7 mA
Input delay
• At “0” to “1”
• At “1” to “0”
25 to 75 s
25 to 75 s
Input characteristic curve According to
IEC 61131, type 1
Connection of Two-Wire
BEROs
• Permitted bias current
Possible
max. 1.5 mA
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