Meaning of the RUN/STOP, ERROR and MAINT LEDs
The CPU1513-1PN 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 5-1Meaning of the LEDs
RUN/STOP LED ERROR LED MAINT LED Meaning
LED off LED off LED off
Missing or insufficient power supply on the CPU.
LED off
LED flashes red
LED off
An error has occurred.
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 off LED lit yellow
OPC UA server of the CPU expects initial trust lists
and CRLs via GDS Push function.
LED lit green LED off
LED flashes yellow
Bad configuration
LED lit yellow
LED flashes red
LED off
A diagnostics event is pending.
LED lit yellow LED off
LED flashes yellow
Firmware update using SIMATIC memory card suc
cessfully completed.
CPU is in STOP mode.
LED lit yellow LED off LED off
CPU runs a program with active breakpoints. The
program is at a breakpoint.
The program on the SIMATIC memory card is caus
ing an error.
Firmware update using SIMATIC memory card has
failed.
LED lit yellow
LED flashes red LED flashes yellow
The CPU has detected an error state. Additional
information is available via the CPU diagnostic buf
fer.
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 moving from one break
point to another.
LED flashes yellow
LED off LED off
Firmware update is being performed.
LED flashes
yellow/green
LED off LED off
Startup (transition from STOP → RUN)
35
Interrupts, error messages, diagnostics and system alarms
5.1 Status and error display of the CPU
CPU 1513-1 PN (6ES7513-1AM03-0AB0)
Equipment Manual, 11/2022, A5E40881673-AC
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