| Article number |
6ES7421-7BH01-0AB0 |
6ES7421-1BL01-0AA0 |
6ES7421-1EL00-0AA0 |
6ES7421-1FH20-0AA0 |
6ES7421-7DH00-0AB0 |
|
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 |
| Supply voltage |
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| Load voltage L+ |
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| ● Rated value (DC) |
24 V |
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| ● permissible range, lower limit (DC) |
20.4 V |
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| ● permissible range, upper limit (DC) |
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 |
| 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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| ● Rated value |
120 mA |
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| ● permissible range, lower limit |
0 mA |
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| ● permissible range, upper limit |
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) |
| Digital inputs |
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| Number of digital inputs |
16 |
32 |
32 |
16 |
16 |
| Number of simultaneously controllable inputs |
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| ● Number of simultaneously controllable inputs |
16 |
32 |
32 |
16 |
16 |
| Input voltage |
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| ● Type of input voltage |
DC |
DC |
AC/DC |
AC/DC |
AC/DC |
| ● Rated value (DC) |
24 V |
24 V |
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| ● Rated value (UC) |
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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) |
| ● for signal “0” |
-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 |
| ● for signal “1” |
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 |
| Input current |
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| ● for signal “0”, min. |
6 mA; < 6 mA |
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0 mA |
0 mA; AC: 0 mA; DC: 0 mA |
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| ● for signal “0”, max. (permissible quiescent current) |
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1.3 mA |
1 mA |
6 mA; AC: 6 mA; DC: 2 mA |
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| ● for signal “1”, typ. |
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 |
| Input delay (for rated value of input voltage) |
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| for standard inputs |
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| — parameterizable |
Yes |
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Yes |
| — Rated value |
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0.5 ms; 0.5 / 3 / 10 / 20 ms |
| — at “0” to “1”, min. |
3 µs; 0.05 / 0.1 / 0.5 / 3 ms |
1.2 ms |
5 ms |
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| — at “0” to “1”, max. |
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4.8 ms |
25 ms; 10 / 20 ms |
20 ms; AC: 20 ms; DC: 15 ms |
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| — at “1” to “0”, min. |
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1.2 ms |
5 ms |
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| — at “1” to “0”, max. |
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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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| ● Fixed current limitation for wire-break monitoring, min. |
10 kΩ |
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18 kΩ; 18 kohms: Rated voltage 24 V (15 to 35 V); 39 kohms: Rated voltage 48 V (30 to 60 V) |
| ● Fixed current limitation for wire-break monitoring, max. |
18 kΩ |
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56 kΩ; Rated voltage 60 V (50 to 72 V) |
| Cable length |
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| ● shielded, max. |
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 |
| ● unshielded, max. |
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 |
| Encoder |
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| Connectable encoders |
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| ● 2-wire sensor |
Yes |
Yes |
Yes |
Yes |
Yes |
| — permissible quiescent current (2-wire sensor), max. |
3 mA |
1.5 mA |
1 mA |
5 mA; AC: 5 mA |
0.5 mA; 0.5 to 2 mA |
| Interrupts/diagnostics/status information |
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| Diagnostics function |
Yes; Parameterizable |
No |
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No |
Yes; Parameterizable |
| Alarms |
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| ● Diagnostic alarm |
Yes; Parameterizable |
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Yes; Parameterizable |
| ● Hardware interrupt |
Yes; Parameterizable |
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Yes; Parameterizable |
| Diagnoses |
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| ● Diagnostic information readable |
Yes |
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Yes; possible |
| ● Monitoring the supply voltage |
Yes |
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| ● Wire-break |
Yes; I < 1 mA |
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Yes; I> 0.7 mA |
| Diagnostics indication LED |
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| ● Rated load voltage PWR (green) |
Yes; Per group |
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| ● internal fault INTF (red) |
Yes |
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| ● external fault EXTF (red) |
Yes |
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| ● Status indicator digital input (green) |
Yes |
Yes |
Yes |
Yes |
Yes |
| ● Channel fault indicator F (red) |
No |
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No |
| Potential separation |
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| Potential separation digital inputs |
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| ● between the channels |
Yes |
No |
Yes |
Yes |
Yes |
| ● between the channels, in groups of |
8 |
32 |
8 |
4 |
1 |
| ● between the channels and backplane bus |
Yes |
Yes |
Yes |
Yes |
Yes |
| Isolation |
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| Isolation tested with |
500 V DC |
500 V DC |
1 500 V AC |
1 500 V AC |
1 500 V AC |
| Dimensions |
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| Width |
25 mm |
25 mm |
25 mm |
25 mm |
25 mm |
| Height |
290 mm |
290 mm |
290 mm |
290 mm |
290 mm |
| Depth |
210 mm |
210 mm |
210 mm |
210 mm |
210 mm |
| Weights |
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| Weight, approx. |
600 g |
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600 g |
650 g |
600 g |
