| PWR power indicator (Green) | Description |
|---|---|
| On | Normal system power supply |
| Off | Abnormal system power supply |
| ERR fault indicator (Red) | Description |
| On | Failed configuration |
| Off | Normal communication |
| Flash | Invalid parameter configuration |
| Slow Flash | Communication failure |
| Channel indicator (Green) | Description |
| On | With input or output signal |
| Off | No input or output signal |