Siemens Simatic S7-300 - Page 129

Digital Modules
3-45
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Technical specifications of the SM 321; DI 8 x 120/230 VAC ISOL
Dimensions and Weight
Dimensions W x H x D 40 x 125 x 117
Weight Approx. 240 g
Data for Specific Module
Supports clocked
operation
No
Number of inputs 8
Length of cable
• Unshielded
• Shielded
max. 600 m
max. 1000 m
Voltages, Currents, Potentials
Rated load voltage L1
All load voltages must be of the
same phase
120/230 VAC
Number of inputs that can be
triggered simultaneously
• Horizontal configuration
Up to 60 °C
8
• Vertical configuration
Up to 40 °C
8
Isolation
• Between channels and
backplane bus
Yes
• Between channels Yes
In groups of 1
Permitted potential difference
• Between M
internal
and the
inputs
230 VAC
• Between the inputs of the
different groups
500 VAC
Insulation tested with
• Between M
internal
and the
inputs
1500 VAC
• Between the inputs of the
different groups
2000 VAC
Current consumption
• From the backplane bus max. 100 mA
Power dissipation of the module typ. 4.9 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”
• Frequency range
120/230 VAC
79 to 264 V
0 to 40 V
47 to 63 Hz
Input current
• At signal “1”
120 V, 60 Hz
230 V, 50 Hz
typ. 7.5 mA
typ. 17.3 W
Input delay
• ”0” to “1”
• ”0” to “1”
max. 25 ms
max. 25 ms
Input characteristic curve According to
IEC 61131, type 1
Connection of Two-Wire
BEROs
Possible
• Permitted bias current max. 2 mA