Siemens SIMATIC S7-1500 Manual page 29

Meaning of the LED displays
The CPU 1515-2 PN has three LEDs to signal the current operating status and diagnostics
status. The following table shows the meaning of the various combinations of colors for the
RUN/STOP, ERROR and MAINT LEDs.
Table 4- 1
RUN/STOP LED
LED lit green
LED lit green
LED lit green
LED lit green
LED lit yellow
LED lit yellow
LED lit yellow
LED flashes yel-
LED flashes
yellow/green
LED flashes
yellow/green
CPU 1515-2 PN (6ES7515-2AM00-0AB0)
Manual, 12/2014, A5E32332431-AB
Meaning of the LEDs
ERROR LED
LED off LED off
LED off
LED flashes red
LED off
LED flashes red
LED off
LED off
LED off
LED off
LED flashes red
LED off
low
LED off
LED flashes red
Interrupts, error messages, diagnostics and system alarms
4.1 Status and error display of the CPU
MAINT LED
Missing or insufficient power supply on
the CPU.
LED off
An error has occurred.
LED off
CPU is in RUN mode.
LED off
A diagnostics event is pending.
LED off
Maintenance demanded for the plant.
LED lit yellow The affected hardware must be
checked/replaced within a short period of
time.
Active Force job
PROFIenergy pause
Maintenance required for the plant.
The affected hardware must be
LED flashes
checked/replaced within a foreseeable
yellow
period of time.
Bad configuration
Firmware update successfully
completed.
LED flashes
yellow
CPU is in STOP mode.
LED off
The program on the SIMATIC memory
card is causing an error.
LED flashes
CPU defective
yellow
CPU is performing internal activities
during STOP, e.g. startup after STOP.
LED off
Download of the user program from the
SIMATIC memory card
Startup (transition from RUN → STOP)
LED off
Startup (CPU booting)
Test of LEDs during startup, inserting a
LED flashes
module.
yellow
LED flashing test
Meaning
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