The following table describes the LEDs on the simplex S-series DO 32-channel high-side card and the redundant S-series DO 32-channel 24 VDC high-side Plus card.
| LED correct operating condition | Fault indication | Possible causes and corrective action |
|---|---|---|
| Power-On (green) | Off | System power is not supplied to the card. Check the power connections. |
| Internal fault. Contact technical support. | ||
| Error-Off | Red (continuous) | Communications error. Check connections, cable, and external device. |
| Red (flashing) | Address conflict. Replace card with known good card of same type; contact technical support. |