6ES7321-1FF01-0AA0

SIMATIC S7-300, digital input SM 321, isolated, 8 DI, 120 V/230 V AC, 1x 20-pole

Siemens spare part — S7-300 product cancellation (PM410, 1 October 2025); available as a spare part until 2033.

Kategoria produktu

Moduły cyfrowe

Producent

SIEMENS

Seria produktów

S7-300

General information
Product function
Isochronous mode	No
Supply voltage
Load voltage L1
Rated value (AC)	230 V; 120/230 V AC
Input current
from backplane bus 5 V DC, max.	29 mA
Power loss
Power loss, typ.	4.9 W
Digital inputs
Number of digital inputs	8
Input characteristic curve in accordance with IEC 61131, type 1	Yes
Number of simultaneously controllable inputs
horizontal installation
up to 60 °C, max.	8
vertical installation
up to 40 °C, max.	8
Input voltage
Type of input voltage	AC
Rated value (AC)	230 V; 120/230 V AC (47 ... 63 Hz)
for signal "0"	0 to 40V
for signal "1"	79 to 264V
Input current
for signal "1", typ.	6.5 mA; (120 V); 11 mA (230 V)
Input delay (for rated value of input voltage)
for standard inputs
parameterizable	No
at "0" to "1", max.	25 ms
at "1" to "0", max.	25 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.	2 mA
Interrupts/diagnostics/status information
Alarms	No
Diagnostics function	No
Alarms
Diagnostic alarm	No
Hardware interrupt	No
Diagnostics indication LED
Group error SF (red)	No
Status indicator digital input (green)	Yes
Potential separation
Potential separation digital inputs
between the channels	No
between the channels, in groups of	2
between the channels and backplane bus	Yes; Optocoupler
Isolation
Isolation tested with	4 000 V DC
Connection method
required front connector	20-pin
Dimensions
Width	40 mm
Height	125 mm
Depth	120 mm
Weights
Weight, approx.	240 g
Approvals / Certificates