Siemens SIMATIC ET 200SP User Manual page 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
RUN/STOP LED
LED lights up
LED lights up
LED flashes yel-
LED flashes
yellow/green
CPU 1515SP PC (F)
Manual, 05/2017, A5E32701806-AC
Meaning of the LED displays
ERROR LED
LED off LED off
LED off
LED flashes red
LED green LED off
LED green
LED flashes red
LED green LED off
LED green LED off
LED off
yellow
LED flashes red
yellow
LED off
low
LED off
Diagnostics, error and system alarm
MAINT LED
POWER OFF
LED 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
state Power OFF.
An error has occurred.
LED off
Software controller of the
CPU 1515SP PC (F) is in RUN mode.
LED off
A diagnostics event is pending.
LED off
Maintenance demanded for the plant.
LED lights up The affected hardware must be ex-
yellow changed within a short period.
Maintenance required for the plant.
You must exchange the affected hard-
LED flashes yel-
ware within a foreseeable period.
low
Firmware update successfully completed
Software controller of the CPU is in the
operating state STOP.
LED off
The user program is causing an error.
CPU defective
LED flashes yel-
low
CPU is performing internal activities
during STOP, e.g. ramp-up after STOP.
LED off
Loading the user program
Startup (transition from RUN → STOP)
LED off
6.1 Status and error display
Meaning
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