Diagnostics, error and system alarm
6.1 Status and error display
CPU 1515SP PC (F)
Manual, 05/2017, A5E32701806-AC
47
Meaning of the LED displays with active software controller
CPU 1515SP PC (F) has a display of the current operating state and of the diagnostics
status (three LEDs).
The following table shows the meaning of the color combinations of the LED displays in
connection with the software controller.
Table 6- 1 Meaning of the LED displays
LED off
LED off
LED off
POWER OFF
Starting of the CPU 1515SP PC (F) in
the "Windows only" mode
No power supply.
The software controller of the
CPU 1515SP PC (F) has not been down-
loaded or the
software controller of the
CPU 1515SP PC (F) is in the operating
LED off
An error has occurred.
Software controller of the
CPU 1515SP PC (F) is in RUN mode.
LED green
LED off
A diagnostics event is pending.
LED green
LED off
LED lights up
Maintenance demanded for the plant.
The affected hardware must be ex-
changed within a short period.
LED green
LED off
LED flashes yel-
low
Maintenance required for the plant.
You must exchange the affected hard-
ware within a foreseeable period.
Firmware update successfully completed
LED off
LED off
Software controller of the CPU is in the
operating state STOP.
LED lights up
yellow
LED flashes red
LED flashes yel-
The user program is causing an error.
CPU defective
LED flashes yel-
LED off
LED off
CPU is performing internal activities
during STOP, e.g. ramp-up after STOP.
Loading the user program
LED flashes
LED off
LED off
Startup (transition from RUN → STOP)
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