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Article number |
6ES7421-7BH01-0AB0 |
6ES7421-1BL01-0AA0 |
6ES7421-1EL00-0AA0 |
6ES7421-1FH20-0AA0 |
6ES7421-7DH00-0AB0 |
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SM421, 16DI, DC24V, 0.05MS INPUT DELAY |
SM421, 32DI, DC24V |
SM421, 32DI, DC/AC 120V |
SIMATIC S7-400, DIG.INPUT MOD. |
SIMATIC S7-400, SM 421 |
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Supply voltage |
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Load voltage L+ |
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24 V |
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20.4 V |
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28.8 V |
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Input current |
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from supply voltage L+, max. |
120 mA |
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from backplane bus 5 V DC, max. |
130 mA |
20 mA |
200 mA |
80 mA |
150 mA |
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Encoder supply |
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Number of outputs |
2 |
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Type of output voltage |
L+ (-2.5 V) |
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Short-circuit protection |
Yes; Electronic |
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additional (redundant) feed |
Yes; possible |
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Output current |
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120 mA |
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0 mA |
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150 mA |
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Power loss |
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Power loss, typ. |
5 W |
6 W |
6.5 W |
12 W |
8 W; 3.5 W (24 V DC); 6.5 W (48 V DC); 8.0 W (60 V DC) |
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Digital inputs |
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Number of digital inputs |
16 |
32 |
32 |
16 |
16 |
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Number of simultaneously controllable inputs |
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16 |
32 |
32 |
16 |
16 |
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Input voltage |
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DC |
DC |
AC/DC |
AC/DC |
AC/DC |
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24 V |
24 V |
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120 V; 47 … 63 Hz |
230 V; 120/230 V UC (47 … 63 Hz) |
24 V; 24 V UC to 60 V UC (47 … 63 Hz) |
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-30 V DC to +5 V DC |
-30 V DC to +5 V DC |
0 to 20 V UC |
0 to 40 V AC/ -40 to +40 V DC |
-6 to +6 V DC/ 0 to 5 V AC |
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11 V DC to 30 V DC |
13 V DC to 30 V DC |
79 to 132 V AC; 80 to 132 V DC |
74 to 264 V AC; 80 to 264 V DC, -80 to -264 V |
15 to 72 V DC; -15 to -72 V DC; 15 to 60 V AC |
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Input current |
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6 mA; < 6 mA |
0 mA |
0 mA; AC: 0 mA; DC: 0 mA |
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1.3 mA |
1 mA |
6 mA; AC: 6 mA; DC: 2 mA |
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6 mA; 6 to 8 mA |
7 mA |
2 mA; 2 to 5 mA |
10 mA; at 120 V: 10 mA AC, 1.8 mA DC; at 230 V: 14 mA AC, 2 mA DC |
4 mA; 4 to 10 mA |
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Input delay (for rated value of input voltage) |
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for standard inputs |
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Yes |
Yes |
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0.5 ms; 0.5 / 3 / 10 / 20 ms |
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3 µs; 0.05 / 0.1 / 0.5 / 3 ms |
1.2 ms |
5 ms |
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4.8 ms |
25 ms; 10 / 20 ms |
20 ms; AC: 20 ms; DC: 15 ms |
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1.2 ms |
5 ms |
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4.8 ms |
25 µs |
30 ms; AC: 30 ms; DC: 25 ms |
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Encoder connection |
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10 kΩ |
18 kΩ; 18 kohms: Rated voltage 24 V (15 to 35 V); 39 kohms: Rated voltage 48 V (30 to 60 V) |
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18 kΩ |
56 kΩ; Rated voltage 60 V (50 to 72 V) |
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Cable length |
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1 000 m; 1 000 m: 3 ms, 70 m: 0.5 ms, 30 m: 0.1 ms, 30 m: 0.05 ms |
1 000 m |
1 000 m |
1 000 m |
1 000 m |
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600 m; 600 m: 3 ms; 50 m: 0,5 ms; 20 m: 0,1 ms; 20 m: 0,05 ms |
600 m |
600 m |
600 m |
600 m; 600 m: 3, 10, 20 ms; 100 m: 0,5 ms |
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Encoder |
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Connectable encoders |
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Yes |
Yes |
Yes |
Yes |
Yes |
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3 mA |
1.5 mA |
1 mA |
5 mA; AC: 5 mA |
0.5 mA; 0.5 to 2 mA |
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Interrupts/diagnostics/status information |
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Diagnostics function |
Yes; Parameterizable |
No |
No |
Yes; Parameterizable |
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Alarms |
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Yes; Parameterizable |
Yes; Parameterizable |
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Yes; Parameterizable |
Yes; Parameterizable |
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