Siemens simatic ET 200SP User Manual page 40

Diagnostics, error and system alarm
6.1 Status and error display
Meaning of the LED displays with active software controller
The CPU 1515SP PC has three LED displays to indicate the current operating status and the
diagnostic status.
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
LED flashes
yellow/green
40
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
LED flashes red
MAINT LED
POWER OFF
LED off Missing or insufficient supply voltage on
the CPU 1515SP PC.
An error has occurred.
LED off
Software controller of the
CPU 1515SP PC is in the operating state
LED off
RUN.
A diagnostics event is pending.
LED off
Maintenance demanded for the plant.
LED lights up The affected hardware must be replaced
yellow within a short period of time.
Maintenance required for the plant.
The affected hardware must be replaced
LED flashes yel-
within a reasonable time 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
Startup (CPU booting)
Test of LEDs during startup, inserting a
LED flashes yel-
module.
low
LED flashing test
Meaning
CPU 1515SP PC
Manual, 12/2014, A5E32701806-AA