Siemens SINUMERIK 840DE sl Commissioning Manual page 1330

System settings
1.4 Displays during system booting
System error
See diagram: Figure 1-1 Diagnostic displays of the NCU (Page 8)
RDY LED Additional
LEDs
Rapidly Set from the
flashing PLC or option
red (2Hz) module
Rapidly Set from the
flashing PLC or option
red/orange module
(2 Hz)
12
Meaning 7-segment
display
Permanent error:
The system is stop‐
ped.
Temporary error:
The system may con‐
tinue to run with re‐
stricted functions.
Meaning
C "crash": The operating system crashes (this approxi‐
mately corresponds to a Blue Screen for Windows);
details can be found in the system log file.
P "partition": Error when repartitioning
E "error": A read or write error has occurred on the Com‐
pactFlash Card (an additional point is displayed for a
write error). It is possible that the CompactFlash Card
is defective and should be replaced.
F "full": The CompactFlash Card is too full, so it is prob‐
able that not all of the services will be able to be suc‐
cessfully started.
When booting, this error is displayed for 1 minute; the
system then continues to boot, however, it can be as‐
sumed that problems will occur.
Commissioning Manual, 12/2017, 6FC5397-1DP40-6BA1
NCU operating system