S7-300 Input for Siemens Logic Controller

SIMATIC S7-300, Digital input SM 321, Isolated 32 DI, 24 V DC, 1x 40-pole

Product Details

Product Description


SIMATIC S7-300, Digital input SM 321, Isolated 32 DI, 24 V DC, 1x 40-pole

Brand Name


Model Number


Net Weight (kg)

0,301 Kg

Place of Origin


Lead Time

In Stock

Packaging Dimension

13,10 x 14,60 x 5,10

Delivery Time

2-3 days


SM 321 digital input modules

Detailed Images

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. : 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 +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


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

Diagnostics function :No


● 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 tested with 500 V DC

Connection method

required front connector 40-pin


Width :40 mm

Height :125 mm

Depth :120 mm


Weight, approx. 260 g

Our Main Market:

We sales Siemens ,Allen Bradley,Mitsubishi,Schneider,Omron,ABB,Yaskawa,Panasonic, Fanuc, KOYO,Delta,E+H, Honeywell,PEPPERL FUCHS, Phoenix Contact etc.


Our team


Packing & Delivery

We ship worldwide

The fastest and the most competitive service, regardless of size and weight.

We use global companies that are fast and reliable(UPS,DHL,FedEx, TNT and DPD)

Express delivery is available

We can ship on the customer's shipping account.

Normal shipping time.

HK.Singapore 1 day

Europe, USA, and Canada 1-2 days


Our Company


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