Status LEDs of the CPU

The CPUs PM554 and PM564 show their status of operation via 3 LEDs located in the left upper edge of the CPU.

LED	Status	Color	LED = ON	LED = OFF	LED flashing
PWR	Power supply	green	Power supply present	Power supply missing	–
RUN	RUN/STOP Status	green	CPU is in status RUN	CPU is in status STOP	Fast flashing (4 Hz): The CPU is reading/writing data to the SD Memory Card. If the ERR-LED is also flashing, data is written to the Flash-EEPROM. Slow flashing (1 Hz): The firmware update from the SD Memory Card has been finished successfully.
ERR	Error indication	red	An error occurred	No errors or only warnings encountered (E4-errors). The LED behaviour by the error classes 2 to 4 is configurable.	with 4 Hz (fast): displays together with the RUN LED a currently running firmware-upgrade or writing data to the Flash-EPROM.