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.