Siemens Simatic S7-300 - Page 101

Digital Modules
3-17
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Technical specifications of the SM 321; DI 32 x 120 VAC
Dimensions and Weight
Dimensions W x H x D
(in millimeters)
40 x 125 x 117
Weight Approx. 300 g
Data for Specific Module
Supports clocked
operation
No
Number of inputs 32
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 40 C 32
Up to 60 C 24
• Vertical configuration
Up to 40 C 32
Isolation
• Between channels and
backplane bus
Yes
• Between the channels
Yes
In groups of 8
Permitted potential difference
• Between M
internal
and
the inputs
120 VAC
• Between the inputs of
the different groups
250 VAC
Insulation tested with 2500 VDC
Current consumption
• From the backplane bus
max. 16 mA
Power dissipation of the module typ. 4 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 ‘‘1’’ signal
• For ‘‘0’’ signal
• Frequency range
120 VAC
74 to 132 V
0 to 20 V
47 to 63 Hz
Input current
• At ‘‘1’’ signal
typ. 21 mA
Input delay
• From ‘‘0’’ to ‘‘1’’
• From ‘‘1’’ to ‘‘0’’
max. 15 ms
max. 25 ms
Input characteristic curve According to
IEC 61131, type 2
Connection of Two-Wire
BEROs
• Permitted bias current
Possible
max. 4 A