Siemens SIMATIC ET 200SP User Manual page 48

Diagnostics, error and system alarm
6.1 Status and error display
RUN/STOP LED
LED flashes
yellow/green
POWER LED
Table 6- 2
48
ERROR LED
LED flashes red
POWER LED
POWER LED
LED off
LED lights up yellow
LED green
MAINT LED
Startup (CPU booting)
Test of LEDs during startup, inserting a
LED flashes yel-
module.
low
LED flashing test
Meaning
No supply voltage or supply voltage too low
Supply voltage present;
running through BIOS phase;
operating system is shut down
Supply voltage present;
Booting or operation of the operating system
Meaning
CPU 1515SP PC (F)
Manual, 05/2017, A5E32701806-AC