Indicator Description
| Indicator | Description |
| PWR (Green) |
Module power indicator: On: Power supply is normal Off: Power supply is abnormal |
| RUN (Green) |
Communication indicator: On: Normal communication Off: Abnormal communication |
| LED1 |
Input1 indicator On: Input1 has input signal Off: Input1 has no input signal |
| LED2 |
Input2 indicator On: Input2 has input signal Off: Input2 has no input signal |