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SIMATIC S7, DIGITAL INPUT SM 321, OPTICALLY ISOLATED, 4 DI, 24V DC, NAMUR/DIN 19234, F. SIGNALS F HAZARDOUS AREAS, CAPABLE OF DIAGNOST.,PTB-TESTED |
| Supply voltage |
| Load voltage L |
| ● Rated value (DC) |
24 V |
| Input current |
| from load voltage L (without load), max. |
50 mA |
| from backplane bus 5 V DC, max. |
80 mA |
| Encoder supply |
| Output voltage |
via the inputs |
| Power losses |
| Power loss, typ. |
1.1 W |
| Digital inputs |
| Number of NAMUR inputs |
4 |
| Input voltage |
| ● Rated value, DC |
8.2 V; from internal power circuit supply |
| Input current |
| ● on wire break, max. |
0.1 mA |
| ● on short -circuit, max. |
8.5 mA |
| for NAMUR encoders |
| — for signal "0" |
0.35 to 1.2 mA |
| — for signal "1" |
2.1 to 7 mA |
| Input delay (for rated value of input voltage) |
| ● Input frequency (with a time delay of 0.1 ms), max. |
2 kHz |
| for NAMUR inputs |
| — Parameterizable |
Yes; 0.1 / 0.5 / 3 / 15 / 20 ms (plus 0.25 ms preparation time) |
| Cable length |
| ● Cable length unshielded, max. |
200 m |
| Encoder |
| Connectable encoders |
| ● NAMUR encoder |
Yes; Two-wire connection |
| Interrupts/diagnostics/status information |
| Diagnostic messages |
| ● Diagnostic information readable |
Yes |
| Diagnostics indication LED |
| ● Short circuit per channel (red) |
Yes |
| ● Short-circuit group error (red) |
Yes |
| Ex(i) characteristics |
| Module for Ex(i) protection |
Yes |
| Max. values of input circuits (per channel) |
| ● Co (permissible external capacity), max. |
3 µF |
| ● Io (short-circuit current), max. |
14.1 mA |
| ● Lo (permissible external inductivity), max. |
100 mH |
| ● Po (power of load), max. |
33.7 mW |
| ● Uo (output no-load voltage), max. |
10 V |
| Galvanic isolation |
| Galvanic isolation digital inputs |
| ● Galvanic isolation digital inputs |
Yes |
| ● between the channels, in groups of |
1 |
| Standards, approvals, certificates |
| Use in hazardous areas |
| ● Type of protection acc. to EN 50020 (CENELEC) |
[EEx ib] IIC |
| ● Type of protection acc. to FM |
Class II, Division 2, Group A, B, C, D T4 |
| ● Test number PTB |
Ex-96.D.2094X |
| Ambient conditions |
| Operating temperature |
| ● max. |
60 °C |
| Connection method |
| required front connector |
20-pin |
| Weights |
| Weight, approx. |
230 g |
| last modified: |
25.09.2014 |
