Supply voltages
EtherCAT P Box modules indicate the status of the supply voltages via two status LEDs. The status LEDs are labeled with the designations of the supply voltages: Us and Up.
LED  | Display  | Meaning  | 
|---|---|---|
US (control voltage)  | off  | The supply voltage US is not available.  | 
green illuminated  | The supply voltage US is available.  | |
UP (peripheral voltage)  | off  | The supply voltage UP is not available.  | 
green illuminated  | The supply voltage UP is available.  |