PLC SIEMENS S7-300 (SM-321)

Load voltage L+
● Rated value (DC) : 24 V
● permissible range, lower limit (DC) : 20.4 V
● permissible range, upper limit (DC) : 28.8 V

Input current
from backplane bus 5 V DC, max. : 15 mA

Power loss
Power loss, typ. : 6.5 W

Digital inputs
Number of digital inputs : 32
Input characteristic curve in accordance with IEC 61131, type 1 : Yes

Number of simultaneously controllable inputs
horizontal installation
— up to 40 °C, max. : 32
— up to 60 °C, max. : 16
vertical installation
— up to 40 °C, max. : 32

Input voltage
● Type of input voltage : DC
● Rated value (DC) : 24 V
● for signal "0" : -30 to +5 V
● for signal "1" : 13 to 30V

Input current
● for signal "1", typ. : 7 mA

Input delay (for rated value of input voltage)
for standard inputs
— parameterizable No
— at "0" to "1", min. : 1.2 ms
— at "0" to "1", max. : 4.8 ms
— at "1" to "0", min. : 1.2 ms
— at "1" to "0", max. : 4.8 ms

Cable length
● shielded, max. : 1 000 m
● unshielded, max. : 600 m

Encoder
Connectable encoders
● 2-wire sensor : Yes
— permissible quiescent current (2-wire sensor), max. : 1.5 mA

Alarms : No
Diagnostics function : No

Alarms
● Diagnostic alarm : No
● Hardware interrupt : No

Diagnostics indication LED
● Status indicator digital input (green) : Yes

Potential separation
Potential separation digital inputs
● between the channels : No
● between the channels, in groups of : 16
● between the channels and backplane bus : Yes; Optocoupler

Isolation
Isolation tested with : 500 V DC

connection method
required front connector : 40-pin

Dimensions
Width : 40 mm
Height : 125 mm
Depth : 120 mm

Weights
Weight, approx. : 260 g

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