Siemens SINAMICS S120 Manual page 352

Diagnostics
7.2 LEDs on the CU320-2 DP Control Unit
LED Color
OPT –
(OPTION)
Green
Red
RDY and Red
DP
RDY and Orange
OPT
350
State
Flashing Cyclic bus communication has been interrupted
light or could not be established
2 Hz
Off The electronics power supply is missing or lies
outside the permissible tolerance range.
Component is not ready.
Option Board not installed or no associated drive
object has been created.
Steady light Option Board is ready.
Flashing Depends on the option board used.
light
0.5 Hz
Steady light At least one fault is present in this component.
Option board not ready (e.g. after switch on).
Flashing Bus error - communication has been interrupted
light
2 Hz
Flashing Firmware update in progress for connected
light Option
0.5 Hz Board CBE20
Description, cause Remedy
Remove the fault
Check power supply and/or
component
–
–
Remedy and acknowledge
fault
Remove the fault
-
Cabinet Modules
Manual, 03/2013, A5E03263538A