===== Mainboard - Hardware - LED assignment =====
  * [[robots:hako:hardware:esx_3xl:mainboard-led#Location|LEDs location]]
  * [[robots:hako:hardware:esx_3xl:mainboard-led#Description|LEDs description]]


=== Location ===

{{:robots:hako:hardware:led_assignment_location.png?|}}

=== Description ===
1.	**Power ON LED:** (green)\\ 
This LED indicates that all necessary voltages in the ESX-3XL for running the CPU are given. At least +UE and D+ have to be powered on for this.\\ 
If this LED doesn't light, the ESX-3XL has no supply or it is damaged.\\

2.	**ERROR LED:** (red)\\ 
This LED shows severe errors which were encountered during POST (Power On Self Test) or while the system is/was running. The following table shows various blink codes for various errors:

^Blink code^Error name^Explanation of error^
|LED is off|No error|While there is no error the LED remains off|
|LED is always on|Flash ROM error|System encountered a flash ROM CRC error during booting up. System is halted. Please contact your local sales representative!|
|LED is continously fast flashing (5 Hz)|EEPROM error|System encountered a EEPROM read error during POST or a EEPROM write error during runtime. It is possible that this error can be fixed by using the function x_sys_config_supervisor. If the error persists please contact your local sales representative!|
|LED flashes 3x, then pausing for app. 300ms|U<sub>F</sub> error|System encountered a low voltage power supply (< 8 V) error during runtime. This error is non-permanent.|
|LED flashes 2x, then pausing for app. 500ms|U<sub>sys</sub> error|System encountered an error on the system voltages during runtime. This error can be seen for a short time during power up and is non permanent.|
|LED flashes 1x, then pausing for app. 700ms|Watchdog error|System encountered an watchdog error. The watchdog wasn't retriggered in time.|


3.	**User LED 1:** (red/green)\\ 
This LED is freely programmable by the user. Look at x_sys_set_led.\\

4.	**User LED 2:** (red/green) \\
This LED is freely programmable by the user. Look at x_sys_set_led.