The LEDs on the GDPUC panel are labeled RUN, ALM, and ACT respectively.
| LED | Color | Status | Meaning |
|---|---|---|---|
| RUN | Green | On for 1s and off for 1s | The board is working. |
| On for 0.125s and off for 0.125s | The board is loading data. | ||
| On | There is power input but the board is faulty. | ||
| Off | There is no power input or the board is faulty. | ||
| ALM | Red | Off | There is no alarm. |
| On or blinking | There is an alarm. | ||
| ACT | Green | On | The board works properly. |
| Off | There is no power input or the board is faulty. |