Siemens SIMATIC - Page 96

Digital modules
3.12 Digital input module SM 321; DI 16 x DC 24/125 V; with hardware and diagnostic interrupts (6ES7321-
7EH00-0AB0)
S7-300 Module data
96 Manual, 06/2017, A5E00105505-AJ
The resistance used depends on the module's rated input voltage
Table 3- 16 Dependence on rated input voltage and resistance
Rated input voltage L+
Resistance R
s
24 V DC
43 kΩ
48 V DC 100 kΩ
125 V DC
300 kΩ
SM 321; DI 16 x DC 24 V/125V - Technical specifications
Technical specifications
Dimensions and weight
Dimensions W x H x D (mm)
40 x 125 x 117
Weight approx. 200 g
Module-specific data
Supports isochronous mode
No
Supports parameter reassignment in RUN
Yes
• Response of non-programmed inputs
return the process value which was valid before
configuration
Accuracy of the time stamp
> 5 ms*
Number of inputs
16
Cable length
• unshielded
• shielded
max. 600 m
max. 1000 m
Voltages, currents, electrical potentials
Number of simultaneously controlled inputs
• Horizontal mounting position to 60 °C
– L+ = 146 VDC
– L+ = 125 VDC
– L+ = 100 VDC
8
12
16
• Vertical mounting position to 40 °C
– L+ = 146 VDC
– L+ = 125 VDC
– L+ = 100 VDC
8
12
16
Electrical isolation
• between channels and the backplane bus
• between channels
Yes
No
Maximum potential difference
• between different circuits
300 V DC / 250 V AC
Isolation test voltage
3500 VDC