Digital Modules
3-37
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Technical specifications of the SM 321; DI 16 x 24/48 VUC
Dimensions and Weight
Dimensions W x H x D 40 x 125 x 117
Weight Approx. 260 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
• Horizontal configuration
Up to 60°C
16
• All other configuration types
Up to 40° C
16
Isolation
• Between channels and
backplane bus
Yes
• Between channels
In groups of
Yes
1
Permitted potential difference
• Between the channels and
the backplane bus
170 VDC, 120 VAC
• Between the inputs of the
different groups
170 VDC, 120 VAC
Insulation tested with
• Between the channels and
the backplane bus
1500 VAC
• Between the inputs of the
different groups
1500 VAC
Current consumption
• From the backplane bus max. 100 mA
Power dissipation of the module
• Operation with 24 V
• Operation with 48 V
typ. 1.5 W
typ. 2.8 W
Status, Interrupts, Diagnostics
Status display
Interrupts
Diagnostic functions
Green LEDs per
channel
None
None
Data for Selecting a Sensor
Input voltage
• Rated value 24 or 48 VDC/ 24 or
48 VAC
• At signal “1”
• At signal “0”
• Frequency range
14 V to 60 V
–5 V to 5 V
0 to 63 Hz
Input current
• At signal “1”
• At signal “0”
typ. 2.7 mA
–1 to +1 mA
Input delay
• From “ 0” to “1”
• At “1” to “0”
max. 16 ms
max. 16 ms
Input characteristic curve According to
IEC 61131, type 1
Connection of Two-Wire
BEROs
Possible
• Permitted bias current max. 1 mA
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