Digital I/O is two-state (on/off, 0/1): buttons, sensors, relays, contactors. Analog I/O carries a continuous value: temperature, pressure, level, speed reference.
- Digital I/O
- Typically 24 V DC
- Analog current
- 4–20 mA (noise-resistant)
- Analog voltage
- 0–10 V
Over long distances 4-20 mA is preferred over 0-10 V; a current signal is less affected by cable resistance and noise.
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