Order number: "Standard module"
6ES7321-1BL00-0AA0
Order number: "SIPLUS S7-300 module"
6AG1321-1BL00-2AA0
Properties
Properties of SM 321; DI 32 x DC 24 V:
● 32 inputs, isolated in groups of 16
● Rated input voltage 24 VDC
● Suitable for switches and 2-/3-/4-wire proximity switches (BEROs)

Wiring and block diagrams of SM 321; DI 32 x DC 24 V

Terminal assignment of SM 321; DI 32 x DC 24 V
The figure below shows how channels are assigned to addresses (input byte x up to input byte x+3).

Technical specifications of SM 321; DI 32 x DC 24 V

	SIMATIC S7-300, DIGITAL INPUT SM 321, OPTICALLY ISOLATED 32DI, 24 V DC, 1 X 40 PIN
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 losses
Power loss, typ.	6.5 W
Digital inputs
Number/binary inputs	32
Input characteristic curve acc. to 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 30 V
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
Cable length
Cable length, shielded, max.	1000 m
Cable length 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
Alarms
Alarms	No
Diagnostic alarm	No
Hardware interrupt	No
Diagnostic messages
Diagnostic functions	No
Diagnostics indication LED
Status indicator digital input (green)	Yes
Galvanic isolation
Galvanic isolation digital inputs
between the channels	No
between the channels, in groups of	16
between the channels and the backplane bus	Yes; Optocoupler
Permissible potential difference
between different circuits	75 VDC / 60 VAC
Isolation
Isolation checked with	500 V DC
Connection method
required front connector	40-pin
Dimensions
Width	40 mm
Height	125 mm
Depth	120 mm
Weight
Weight, approx.	260 g

USER'S manual PDF of 321-1BL00, please refer to Page 72- Page 75:

S7-300 Modules data & USER'S MANUAL

Our company (Kollewin Technology CO., Limited) have a new product,

named 6ES7321-1BL00-0AA0,

it is 100% compatible with Siemens original part.

Part#: 6ES7321-1BL00-0AA0

Unit price:USD191.00/pc 
Description: S7-300 Digital input module
Manufacturer: Kollewin
Approx. Weight: 0.3 Kg
Warranty: 1 year
Origin: China

Here, you also need 1 piece of 40 pin front connector to connect with it..

Our compatible 6ES7 392-1AM00-0AA0 can meet your requirements.

6ES7 392-1AM00-0AA0  @USD16.90/pc  

Technical data sheet of our SM 321  6ES7321-1BL00-0AA0

Pictures of 6ES7321-1BL00-0AA0

More compatible Siemens S7-200/300 modules we can offer：

More pictures for your reference:

Please feel free to contact me for any question!

Contact person: Miss Nancy