The SM 338 POS input module can be used as an interface between up to 3 absolute encoders and the S7-300 CPU. It makes position-encoder values available for subsequent processing in the control and provides the conditions for the control to respond directly to encoder values in systems under motion.
Siemens POS Input Modules SIMATIC S7-300 Product Specifications:
| Article number |
6ES7338-4BC01-0AB0
SM 338, f. 3 SSI encoders |
| Supply voltage |
| Load voltage L+ |
|
| ● Rated value (DC) |
24 V |
| ● permissible range, lower limit (DC) |
20.4 V |
| ● permissible range, upper limit (DC) |
28.8 V |
| Input current |
| from load voltage L+ (without load), max. |
100 mA |
| from backplane bus 5 V DC, max. |
160 mA |
| Encoder supply |
| 24 V encoder supply |
|
| ● 24 V |
Yes; L+ (-0.8 V) |
| ● Output current, max. |
900 mA |
| Power loss |
| Power loss, typ. |
3 W |
| Digital inputs |
| Input voltage |
|
| ● for signal “0” |
-3 to +5V |
| ● for signal “1” |
11 to 30.2 V |
| Input current |
|
| ● for signal “0”, max. (permissible quiescent current) |
2 mA |
| ● for signal “1”, typ. |
9 mA |
| Input delay (for rated value of input voltage) |
|
| for standard inputs |
|
| — at “0” to “1”, min. |
300 µs |
| Cable length |
|
| ● shielded, max. |
600 m |
| Encoder |
| Number of connectable encoders, max. |
3 |
| Connectable encoders |
|
| ● Absolute encoder (SSI) |
Yes |
| ● 2-wire sensor |
Yes |
| Encoder signals, absolute encoder (SSI) |
|
| ● Cable length, shielded, max. |
320 m; 320 m at 125 kHz; 160 m at 250 kHz; 60 m at 500 kHz; 20 m at 1 MHz |
| Interrupts/diagnostics/status information |
| Alarms |
|
| ● Diagnostic alarm |
Yes |
| connection method / header |
| required front connector |
20-pin |
| Dimensions |
| Width |
40 mm |
| Height |
125 mm |
| Depth |
120 mm |
| Weights |
| Weight, approx. |
235 g |
