Data sheet
6ES7221-1BF32-0XB0
SIMATIC S7-1200, Digital input SM 1221, 8 DI, 24 V DC, Sink/Source
General information
Product type designation
SM 1221, DI 8x24 V DC
Supply voltage
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.
105 mA
Digital inputs
● from load voltage L+ (without load), max.
4 mA; per channel
output voltage / header
supply voltage of the transmitters / header
● product function / supply voltage for transmitters
Yes
Power loss
Power loss, typ.
1.5 W
Digital inputs
Number of digital inputs
● in groups of
Input characteristic curve in accordance with IEC 61131,
type 1
8
2
Yes
Number of simultaneously controllable inputs
all mounting positions
— up to 40 °C, max.
8
horizontal installation
— up to 40 °C, max.
8
— up to 50 °C, max.
8
vertical installation
— up to 40 °C, max.
8
Input voltage
● Rated value (DC)
24 V
● for signal "0"
5 V DC at 1 mA
● for signal "1"
15 V DC at 2.5 mA
Input current
● for signal "0", max. (permissible quiescent current)
1 mA
● for signal "1", min.
2.5 mA
● for signal "1", typ.
4 mA
Input delay (for rated value of input voltage)
for standard inputs
— parameterizable
6ES72211BF320XB0
Page 1/2
Yes; 0.2 ms, 0.4 ms, 0.8 ms, 1.6 ms, 3.2 ms, 6.4 ms and 12.8 ms,
7/7/2022
Subject to change without notice
© Copyright Siemens
selectable in groups of four
for interrupt inputs
— parameterizable
Yes
Cable length
● shielded, max.
500 m
● unshielded, max.
300 m
Interrupts/diagnostics/status information
Alarms
● Diagnostic alarm
Yes
Diagnostics indication LED
● for status of the inputs
Yes
Potential separation
Potential separation digital inputs
● between the channels, in groups of
2
Degree and class of protection
IP degree of protection
IP20
Standards, approvals, certificates
CE mark
Yes
CSA approval
Yes
UL approval
Yes
cULus
Yes
FM approval
Yes
RCM (formerly C-TICK)
Yes
KC approval
Yes
Marine approval
Yes
Ambient conditions
Free fall
● Fall height, max.
0.3 m; five times, in product package
Ambient temperature during operation
● min.
-20 °C
● max.
60 °C
● horizontal installation, min.
-20 °C
● horizontal installation, max.
60 °C
● vertical installation, min.
-20 °C
● vertical installation, max.
50 °C
● permissible temperature change
5°C to 55°C, 3°C / minute
Ambient temperature during storage/transportation
● min.
-40 °C
● max.
70 °C
Air pressure acc. to IEC 60068-2-13
● Storage/transport, min.
660 hPa
● Storage/transport, max.
1 080 hPa
Relative humidity
● Operation at 25 ℃ without condensation, max.
95 %
connection method / header
required front connector
Yes
Mechanics/material
Enclosure material (front)
● Plastic
Yes
Dimensions
Width
45 mm
Height
100 mm
Depth
75 mm
Weights
Weight, approx.
170 g
last modified:
4/1/2022
6ES72211BF320XB0
Page 2/2
7/7/2022
Subject to change without notice
© Copyright Siemens
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