Order number	6ES7221-1BF32-0XB0	6ES7221-1BH32-0XB0
	DIGITAL INPUT SM 1221, 8DI, 24V DC	DIGITAL INPUT SM 1221, 16DI, 24V DC
Product type designation
Supply voltage
Rated value (DC)
● 24 V DC	Yes	Yes
permissible range, lower limit (DC)	20.4 V	20.4 V
permissible range, upper limit (DC)	28.8 V	28.8 V
Input current
from backplane bus 5 V DC, max.	105 mA	130 mA
Digital inputs
● from load voltage L+ (without load), max.	4 mA; per channel	4 mA; per channel
Output voltage
Power supply to the transmitters
● present	Yes	Yes
Power losses
Power loss, typ.	1.5 W	2.5 W
Digital inputs
Number of digital inputs	8	16
● In groups of	2	4
Input characteristic curve in accordance with IEC 61131, type 1	Yes	Yes
Number of simultaneously controllable inputs
all mounting positions
— up to 40 °C, max.	8	16
horizontal installation
— up to 40 °C, max.	8	16
— up to 50 °C, max.	8	16
vertical installation
— up to 40 °C, max.	8	16
Input voltage
● Type of input voltage	DC	DC
● Rated value (DC)	24 V	24 V
● for signal "0"	5 V DC at 1 mA	5 V DC at 1 mA
● for signal "1"	15 VDC at 2.5 mA	15 VDC at 2.5 mA
Input current
● for signal "0", max. (permissible quiescent current)	1 mA	1 mA
● for signal "1", min.	2.5 mA	2.5 mA
● for signal "1", typ.	4 mA; Typical	4 mA; Typical
Input delay (for rated value of input voltage)
for standard inputs
— Parameterizable	Yes; 0.2 ms, 0.4 ms, 0.8 ms, 1.6 ms, 3.2 ms, 6.4 ms ａnd 12.8 ms, selectable in groups of four	Yes; 0.2 ms, 0.4 ms, 0.8 ms, 1.6 ms, 3.2 ms, 6.4 ms ａnd 12.8 ms, selectable in groups of four
for interrupt inputs
— Parameterizable	Yes	Yes
Cable length
● shielded, max.	500 m	500 m
● Unshielded, max.	300 m	300 m
Digital outputs
Number of digital outputs	0	0
short-circuit protection	No	No
Interrupts/diagnostics/status information
Alarms
● Alarms	Yes	Yes
● Diagnostic alarm	Yes	Yes
Diagnostic messages
● Diagnostic functions	Yes	Yes
● Monitoring the supply voltage	Yes	Yes
Diagnostics indication LED
● for status of the inputs	Yes	Yes
● for maintenance	Yes	Yes
● Status indicator digital input (green)	Yes	Yes
Galvanic isolation
Galvanic isolation digital inputs
● between the channels, in groups of	2	4
Degree ａnd class of protection
Degree of protection to EN 60529
● IP20	Yes	Yes
Standards, approvals, certificates
CE mark	Yes	Yes
CSA approval	Yes	Yes
cULus	Yes	Yes
FM approval	Yes	Yes
RCM (formerly C-TICK)	Yes	Yes
Marine approval
● Marine approval		Yes
Ambient conditions
Free fall
● Drop height, max. (in packaging)	0.3 m; five times, in dispatch package	0.3 m; five times, in dispatch package
Ambient temperature in operation
● Permissible temperature range	-20 °C to +60 °C horizontal mounting, -20 °C to 50 °C vertical mounting, 95% humidity, non-condensing
● Min.	-20 °C	-20 °C
● max.	60 °C	60 °C
● Permissible temperature change	5°C to 55°C, 3°C / minute	5°C to 55°C, 3°C / minute
Storage/transport temperature
● Min.	-40 °C	-40 °C
● max.	70 °C	70 °C
Air pressure acc. to IEC 60068-2-13
● Storage/transport, min.	660 hPa	660 hPa
● Storage/transport, max.	1 080 hPa	1 080 hPa
Relative humidity
● Permissible range (without condensation) at 25 °C	95 %	95 %
Connection method
required front connector	Yes	Yes
Mechanics/material
Type of housing (front)
● plastic	Yes	Yes
Dimensions
Width	45 mm	45 mm
Height	100 mm	100 mm
Depth	75 mm	75 mm
Weights
Weight, approx.	170 g	210 g