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Simatic S7-300, Digital Input SM321, optically isolated, 16DI, 24VDC, 20pin, Siemens

Supply voltage
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.		10 mA
Power loss
Power loss, typ.		3.5 W
Digital inputs
Number of digital inputs		16
Input characteristic curve in accordance with IEC 61131, type 1		Yes
Number of simultaneously controllable inputs
horizontal installation
— up to 40 °C, max.		16
— up to 60 °C, max.		16
vertical installation
— up to 40 °C, max.		16
Input voltage
● Type of input voltage		DC
● Rated value (DC)		24 V
● for signal "0"		-30 to +5V
● 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
Isochronous mode
Isochronous operation (application synchronized up to terminal)		No
Interrupts/diagnostics/status information
Diagnostic functions		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		20-pin
Dimensions
Width		40 mm
Height		125 mm
Depth		120 mm
Weights
Weight, approx.		200 g
last modified:		11/21/2017