| Indicator | Color | State | Specification |
|---|---|---|---|
| PWR Indicator | Green | ON | Power supply functioning normally |
| OFF | Power failure or no valid input voltage detected | ||
| RUN Indicator | Green | ON | Main controller in RUN state, user program operating |
| HDD Indicator | Red | Blinking | HDD access in progress or normal read/write operations |
| OFF | HDD inaccessible or no access activity |