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SIMATIC S7-1200, Digital input SM 1221, 16 DI, 24 V DC, Sink/Source
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General information
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Product type designation
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SM 1221, DI 16x24 V DC
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Supply voltage
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Rated value (DC)
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● 24 V DC
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Yes
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permissible range, lower limit (DC)
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20.4 V
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permissible range, upper limit (DC)
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28.8 V
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Input current
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from backplane bus 5 V DC, max.
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130 mA
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Digital inputs
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● from load voltage L+ (without load), max.
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4 mA; per channel
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Output voltage
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Power supply to the transmitters
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● present
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Yes
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Power loss
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Power loss, typ.
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2.5 W
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Digital inputs
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Number of digital inputs
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16
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● in groups of
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4
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Input characteristic curve in accordance with IEC 61131, type 1
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Yes
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Number of simultaneously controllable inputs
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all mounting positions
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— up to 40 °C, max.
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16
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horizontal installation
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— up to 40 °C, max.
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16
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— up to 50 °C, max.
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16
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vertical installation
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— up to 40 °C, max.
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16
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Input voltage
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● Type of input voltage
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DC
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● Rated value (DC)
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24 V
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● for signal "0"
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5 V DC at 1 mA
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● for signal "1"
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15 V DC at 2.5 mA
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Input current
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● for signal "0", max. (permissible quiescent current)
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1 mA
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● for signal "1", min.
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2.5 mA
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● for signal "1", typ.
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4 mA
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Input delay (for rated value of input voltage)
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for standard inputs
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— parameterizable
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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
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for interrupt inputs
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— parameterizable
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Yes
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Cable length
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● shielded, max.
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500 m
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● unshielded, max.
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300 m
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Interrupts/diagnostics/status information
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Alarms
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● Diagnostic alarm
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Yes
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Diagnostics indication LED
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● for status of the inputs
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Yes
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Potential separation
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Potential separation digital inputs
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● between the channels, in groups of
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4
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Degree and class of protection
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Degree of protection acc. to EN 60529
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● IP20
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Yes
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Standards, approvals, certificates
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CE mark
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Yes
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CSA approval
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Yes
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UL approval
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Yes
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cULus
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Yes
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FM approval
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Yes
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RCM (formerly C-TICK)
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Yes
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Marine approval
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Yes
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Ambient conditions
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Free fall
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● Fall height, max.
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0.3 m; five times, in product package
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Ambient temperature during operation
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● min.
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-20 °C
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● max.
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60 °C
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● permissible temperature change
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5°C to 55°C, 3°C / minute
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Ambient temperature during storage/transportation
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● min.
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-40 °C
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● max.
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70 °C
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Air pressure acc. to IEC 60068-2-13
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● Storage/transport, min.
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660 hPa
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● Storage/transport, max.
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1 080 hPa
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Relative humidity
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● Operation at 25 ℃ without condensation, max.
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95 %
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Connection method
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required front connector
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Yes
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Mechanics/material
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Enclosure material (front)
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● Plastic
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Yes
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Dimensions
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Width
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45 mm
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Height
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100 mm
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Depth
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75 mm
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Weights
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Weight, approx.
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210 g
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