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.
| 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 |
| Weight | 0.248 kg |
|---|---|
| Dimensions | 12.8 × 15.2 × 5 cm |
