Siemens SIMATIC S7-300 Module data - Page 119

Digital Modules
3-35
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Technical specifications of the SM 321; DI 16 x 24 VDC
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
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
• Vertical configuration
Up to 40 C 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. 10 mA
Power dissipation of the
module
typ. 3.5 W
Status, Interrupts, Diagnostics
Status display Green LED per channel
Interrupts None
Diagnostic functions None
Data for Selecting a Sensor
Input voltage (reference potential is L+)
• Rated value
• For signal “1”
• For signal “0”
24 VDC
–13 V to –30 V
+30 V to –5 V
Input current
• At signal “1” typ. 7 mA
Input delay
• At “0” to “1”
• At “1” to “0”
1.2 to 4.8 ms
1.2 to 4.8 ms
Input characteristic curve According to IEC 61131,
type 1
Connection of Two-Wire
BEROs
• Permitted bias current
Possible
max. 1.5 mA