Description of LEDs

The LEDs below the display indicate the state of the processor module.

LED	State	Color	LED = ON	LED = OFF	LED flashes
Power LED (PWR)	Denotes the power supply state of the processor module	Green	Voltage is present (24 V DC)	Voltage is missing	-
Run LED (RUN)	Denotes the activity state of the processor module	Green	Processor module is in RUN mode	Processor module is in STOP mode	If the LED flashes fast (4 Hz), a firmware update has finished with no errors. If the Run LED flashes fast (4 Hz), alternating with a flashing Run LED, the firmware is being updated. To enforce boot mode 1, keep the RUN function key pressed during the boot procedure. In this case, the Run LED flashes slowly (1 Hz). A subsequent project download from Automation Builder cancels the flashing.
Error LED (ERR)	Denotes an error	Red	An error has occured.	No errors or only warnings have occurred.	If the ERR LED flashes slowly (1 Hz), a firmware update from the memory card has finished with errors. If the ERR LED flashes fast with AC500 on display a fatal system error has occurred. If the ERR LED flashes fast (4 Hz), alternating with the Run LED, the firmware is being updated.

LED

State

Color

LED = ON

LED = OFF

LED flashes

Power LED (PWR)

Denotes the power supply state of the processor module

Green

Voltage is present (24 V DC)

Voltage is missing

Run LED (RUN)

Denotes the activity state of the processor module

Green

Processor module is in RUN mode

Processor module is in STOP mode

If the LED flashes fast (4 Hz), a firmware update has finished with no errors.

If the Run LED flashes fast (4 Hz), alternating with a flashing Run LED, the firmware is being updated.

To enforce boot mode 1, keep the RUN function key pressed during the boot procedure. In this case, the Run LED flashes slowly (1 Hz). A subsequent project download from Automation Builder cancels the flashing.

Error LED (ERR)

Denotes an error

Red

An error has occured.

No errors or only warnings have occurred.

If the ERR LED flashes slowly (1 Hz), a firmware update from the memory card has finished with errors.

If the ERR LED flashes fast with AC500 on display a fatal system error has occurred.

If the ERR LED flashes fast (4 Hz), alternating with the Run LED, the firmware is being updated.

A running processor module is indicated by the state RUN on the display. A deactivated processor module is indicated by the state STOP. In both cases, the display is backlight is off.