Siemens SIMATIC ET 200SP - Page 48

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