Technical data
SIMATIC S7-300, Digital input SM 321, Potential Isolation, 8 digital inputs, 120V/230V AC, 120 pins
Supply voltage
Load voltage L1
● Rating (AC) 230V; 120/230 V AC
Input current
From the backplane bus DC 5 V, maximum 29 mA
Power loss
Power loss, typical value 4.9W
Digital input
Number of input terminals 8
Input characteristics comply with IEC 61131, type 1 is
The number of inputs that can be controlled simultaneously
Horizontal mounting position
- The maximum value is 60 ℃ and the maximum value is 8 ℃
Vertical mounting position
- The maximum value is 40 ℃ and the maximum value is 8 ℃
Input voltage
● Input voltage type AC
● Rating (AC) 230V; 120/230 V AC (47 ... 63 Hz)
● For signal "0" 0 to 40V
● For signal "1" 79 to 264V
Input current
● For signal "1", the typical value is 6.5 mA; (120 V); 11mA (230 V)
Input delay (when input voltage is rated)
For standard input
- Parameterized no
- When the value ranges from 0 to 1, the maximum value is 25 ms
- When the value ranges from 1 to 0, the maximum value is 25 ms
Conductor length
● Shielding, maximum 1 000 m
● Unshielded, maximum 600 m
sensor
Connectable sensor
● Double wire sensor is
- The maximum allowable closed circuit current (for a dual-wire sensor) is 2 mA
Alarm/diagnosis/status information
Alarm no
Diagnostic function No
alarm
● Check whether the alarm is generated
● Process alarm No
Diagnostic display LED
● Cumulative failure SF (red) No
● Digital input status display (green) Yes
Potential isolation
Digital input potential isolation
● Between channels no
● Between channels, group the number of points 2
● Between the channel and backplane bus is; Photoelectric coupler
insulation
Insulation test, using 4000 V DC
Connect technology/title
Required front plug 20 pins
dimension
Width 40mm
Height 125 mm
Depth 120 mm
weight
Weight, about 240 g