Description of LEDs¶
The LEDs below the display indicate the status 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 Run LED (RUN) flashes fast (4 Hz), the processor module is reading/writing the memory card. Together with a flashing Error LED (ERR), the processor module is writing the internal Flash. If the Run LED flashes slowly (1 Hz), a firmware update from the memory card is finished without errors. |
| Error LED (ERR) | Denotes an error | Red | An error has occurred. After pressing the DIAG function key, the error type and the error code will be displayed. The error codes can be shown by means of the DIAG and OK function keys. |
No errors or only warnings have occurred (must be set in user application). | If the Error LED flashes fast (4 Hz) together with a flashing Run LED, the firmware is updated and a Flash is written. If the Error LED flashes slowly (1 Hz) a firmware update from the memory card is finished with errors. |
A running processor module is indicated with the state RUN on the display, a deactivated processor module is indicated with the state STOP. In both cases the display’s backlight is off.