table shows the meaning of the various combinations of colors for the POWER, RUN/STOP,
ERROR and MAINT LEDs.
Table 5-1Meaning of the LEDs
POWER
LED
RUN/STOP LED ERROR
LED
MAINT
LED
Meaning
LED off LED off LED off LED off
Missing or insufficient supply voltage on
the CPU.
LED lit green LED off
LED flashes red
LED off
An error has occurred.
LED lit green LED lit green LED off LED off
CPU is in RUN mode.
Maintenance demanded for the plant.
The affected hardware must be
checked/replaced within a short period of
time.
Active Force job.
LED lit green LED lit green LED off LED lit yellow
OPC UA server of the CPU expects initial
trust lists and CRLs via GDS Push function.
LED lit green LED lit green
LED flashes red
LED off
Bad configuration.
LED lit green LED lit yellow
LED flashes red
LED off
A diagnostics event is pending.
LED lit green LED lit yellow LED off
LED flashes yellow
Firmware update using SIMATIC memory
card successfully completed.
CPU is in STOP mode.
LED lit green LED lit yellow LED off LED off
CPU runs a program with active break
points. The program is at a breakpoint.
The program on the SIMATIC memory card
is causing an error.
Firmware update using SIMATIC memory
card has failed.
LED lit green LED lit yellow
LED flashes red LED flashes yellow
The CPU has detected an error state. Addi
tional information is available via the CPU
diagnostic buffer.
CPU is performing internal activities during
STOP, e.g. startup after STOP.
Download of the user program from the
SIMATIC memory card
CPU carries out a program with active
breakpoint. The program is presently mov
ing from one breakpoint to another.
LED lit green
LED flashes yellow
LED off LED off
Firmware update is being performed.
LED lit green
LED flashes
yellow/green
LED off LED off
Startup (transition from STOP → RUN)
26
CPU 1512SP-1 PN (6ES7512-1DM03-0AB0)
Equipment Manual, 11/2022, A5E33591411-AE
Interrupts, error messages, diagnostics and system alarms
5.1 Status and error display of the CPU
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