Interrupts, error messages, diagnostics and system alarms
4.1 Status and error display of the CPU
CPU 1510SP-1 PN (6ES7510-1DJ01-0AB0)
26 Equipment Manual, 05/2021, A5E03506268-AD
Meaning of the POWER, RUN/STOP, ERROR and MAINT LEDs
CPU 1510SP-1 PN features an LED for monitoring the supply voltage of the electronics (PWR)
and three LEDs for displaying the current operating and diagnostics status. The following
table shows the meaning of the various combinations of colors for the POWER, RUN/STOP,
ERROR and MAINT LEDs.
Table 4- 1 Meaning of the LEDs
POWER
RUN/STOP LED ERROR
MAINT
Meaning
Missing or insufficient power supply on
the CPU.
A diagnostics event is pending.
LED lit green
LED lit green
LED off
LED lit yellow
Maintenance demanded for the plant.
The affected hardware must be
checked/replaced within a short period of
A diagnostics event is pending.
Firmware update successfully completed.
LED lit green
LED lit yellow
LED flashes red
LED flashes yellow
The program on the SIMATIC memory
card is causing an error.
Firmware update using SIMATIC memory
card has failed.
The CPU has detected an error state.
Additional information is available via the
LED lit green
LED flashes yellow
LED off
LED off
CPU is performing internal activities dur-
ing STOP, e.g. startup after STOP.
Download of the user program from the
SIMATIC memory card
CPU carries out a program with active
breakpoint.
LED lit green
LED flashes
LED off
LED off
Startup (transition from STOP → RUN)
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