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Product Information on the Manual S7-300 Module Specifications, Edition 11/2002
A5E00213444-02
Technical specifications of the SM 321; DI 16 DC 24 V
Dimensions and Weight
Dimensions W H D
(in millimeters)
40 125 117
Weight Approx. 200 g
Data for Specific Module
Supports clocked
operation
Yes
Reparameterization in RUN
mode possible
Yes
S Behavior of non paramete-
rized inputs
Supply the las valid
process value before
parameterization
Number of inputs 16
Length of cable
S Unshielded
S Shielded
max. 600 m
max. 1000 m
Voltages, Currents, Potentials
Power rated voltage of the
electronics and sensor L+
24 VDC
S Reverse polarity protection Yes
Number of inputs that can be triggered simultaneously
S Horizontal configuration
Up to 60 _C 16
S Vertical configuration
Up to 40 _C 16
Isolation
S Between channels and
backplane bus
Yes
Permitted potential difference
S Between the different
circuits
75 VDC / 60 VAC
Insulation tested with 500 VDC
Current consumption
S From the backplane bus max. 130 mA
S From load voltage L +
(without sensor supply V
S
)
max. 90 mA
Power dissipation of the module typ. 4 W
Status, interrupts, diagnostics
Status display
S Inputs Green LED per channel
S Sensor power supplies (Vs) Green LED per output
Interrupts
S Hardware interrupt
S Diagnostic interrupt
Parameters can be
assigned
Parameters can be
assigned
Diagnostic functions Parameters can be
assigned
S Group error display Red LED (SF)
S Diagnostics information
read-out
Possible
Monitoring for
S Wire break Yes, for I < 1 mA
Sensor Power Supply Outputs
Number of outputs 2
Output voltage
S With load min. L+ (–2.5 V)
Output current
S Rated value
S Permitted range
120 mA
0 to 150 mA
Additional (redundant) supply Permitted
Short-circuit protection Yes, electronic
Data for Selecting a Sensor
Input voltage
S Rated value
S For signal “1”
S For signal “0”
24 VDC
13 to 30 V
From *30 to + 5 V
Input current
S At signal “1” typ. 7 mA
Input characteristic curve According to IEC
61131, type 2
Connection of Two-Wire
BEROs
S Permitted bias current
Possible
max. 2 mA
Resistor wiring of the sensor for
wire break monitoring
10 to 18 kOhm
Time/Frequency
Internal preparation time for
status processing (in
non-clocked operation)
S Enabling of hardware and
diagnostic interrupt
max. 40 ms
Input delay
S Parameters can be
assigned
S Rated value
Yes
typ.
0.1/0.5/3/15/20 ms
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