Siemens S120 Instructions Manual page 40

The various LEDs are switched on and off as the control unit is powered up (depending on the phase the
system is currently in). When switched on, the color of the LEDs shows the status of the corresponding
power-up phase (see Behavior of the LEDs during booting).
In the event of a fault, power up will be ended in the corresponding phase. The LEDs that are switched on,
retain their color at this particular instant in time, so that the fault can be determined based on the
combination of LEDs that are switched on (bright) and switched off (dark).
All the LEDs go out briefly if the CU310-2 PN has powered up without error. The system is ready for
operation when the LED "RDY" is permanently green.
All the LEDs are controlled by the software loaded during operation (see Behavior of the LEDs in the
operating state).
Behavior of the LEDs during booting
For information about the start-up phase with verification software / firmware, refer to the manual SIEMENS
S120 - GH6
Behavior of the LEDs in the operating state
Table 17 Description of the LEDs during operation of the CU310-2 PN
LED Color
RDY -
(READY)
Green
Red
Red/ Green
Orange
Green/
Orange or
Red/ Orange
Siemens S120_EN_rev06-08062017.docx
Stat Description / cause
OFF The electronics power supply is missing or
outside the permissible tolerance range.
Continuous light The unit is ready for operation.
Cyclic DRIVE-CLiQ communication is in
progress.
Flashing light Commissioning/reset
1x2 sec
Flashing light Writing to the memory card.
2x1 sec.
Flashing light General fault
2x1 sec.
Flashing light The control unit is ready for operation, but
1x2 sec there are no software licenses.
Flashing light Updating the firmware of the DRIVE-CLiQ
1x2 sec components.
Flashing light DRIVE-CLiQ component firmware update
2x1 sec. completed. Waiting for POWER ON of the
corresponding components.
Flashing light Recognition of the component via LED is
2x1 sec. activated (see SINAMICS S120/S150 List
Manual.)
Note: Both options depend on the LED
status
activated.
when component recognition
Remedy
Check the power
supply
-
-
-
Check parameter
assignment/
configuration
Install the missing
licenses.
-
Switch on the
component.
-
is
6-3