S7-PCI315:LED SYS
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The following table describes the meaning of the system LED.
| Color | State | Meaning |
|---|---|---|
| Duo LED yellow/green | ||
 (green) |
On | Operating System running. |
 (green/yellow) |
Flashing | Bootloader is waiting for firmware. |
(yellow) |
Flashing | Heavy system error: PLC in stop. |
(yellow) |
On | Bootloader is waiting for software. |
| / | Off | Power supply for the device is missing or hardware defect. |