Digital Modules
3-25
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
Yes
Parameter changing during the
RUN is possible
Yes
• Behavior of the non para-
meterized inputs
gives the last valid
output value before the
parameterization
Number of inputs 16
Length of cable
• Unshielded
• Shielded
max. 600 m
max. 1000 m
Voltages, Currents, Potentials
Power rated voltage of the
electronics and encoder L+
24 VDC
• Reverse polarity protection Yes
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. 130 mA
• From load voltage L +
(without sensor supply VS)
max. 90 mA
Power dissipation of the module typ. 4 W
Status, Interrupts, Diagnostics
Status display
• Inputs Green LED per channel
• Sensor power supplies (Vs) Green LED per output
Interrupts
• Hardware interrupt
• Diagnostic interrupt
Parameters can be
assigned
Parameters can be
assigned
Diagnostic functions Parameters can be
assigned
• Group error display Red LED (SF)
• Diagnostics information
read-out
Possible
Monitoring of
• Wire-break yes, at I < 1 mA
Sensor Power Supply Outputs
Number of outputs 2
Output voltage
• With load min. L+ (–2.5 V)
Output current
• Rated value
• Permitted range
120 mA
0 to 150 mA
Additional (redundant) supply Permitted
Short-circuit protection Yes, electronic
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 characteristic curve According to
IEC 61131, type 2
Connection of Two-Wire
BEROs
• Permitted bias current
Possible
max. 2 mA
Resistive circuit of the sensor
for detecting broken wires
10 to 18 kOhm
Time/Frequency
Internal processing time for
status processing (in non
synchronous operation)
• Release of process and
diagnosis alarm
max. 40 s
Input delay
• Parameters can be
assigned
• Rated value
Yes
typ. 0.1/0.5/3/15/20 ms
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