Interrupts, diagnostics, error messages and system events
4.1 Status and error display of the CPU
CPU 1515R-2 PN (6ES7515-2RM00-0AB0)
32 Equipment Manual, 11/2019, A5E42009914-AB
The following table shows the meaning of the various color combinations for the RUN/STOP,
ERROR and MAINT LEDs.
Table 4- 1 Meaning of the LEDs
Missing or insufficient supply voltage on the CPU.
LED flashes
LED flashes red
LED flashes yellow
Test of LEDs during startup, inserting a module.
LED flashing test
CPU is in operating state STOP.
Completion of system initialization
LED off
LED lit yellow
CPU executes internal activities in an operating
state ≠ RUN-Redundant.
LED lit yellow
CPU defective
LED lit yellow
LED off
Firmware update successfully completed.
LED flashes
yellow/green
LED off
LED lit yellow
The primary CPU is in operating state STARTUP.
The backup CPU is in operating state SYNCUP.
The backup CPU has not yet been restarted for
SYNCUP during this phase.
LED off
LED off
The CPU performs a warm restart.
LED lit green
LED off
LED lit yellow
Maintenance demanded for the plant.
You need to check/replace the affected hardware
within a short period of time.
The primary CPU is in operating state RUN-
The primary CPU is in operating state RUN.
The CPU is in operating state RUN-Redundant.
There are no events, requirements, errors, etc.
LED lit green
LED off
A diagnostic event is pending in operating state
RUN-Redundant.
LED lit green
LED flashes red
LED lit yellow
A diagnostic event (e.g. failure of an IO device
within the PROFINET ring or no access to
SIMATIC memory card possible
1)
) and mainte-
nance is demanded (e.g. interruption of the
If access to the SIMATIC memory card is not possible in RUN-Redundant (wrong card, card full/write protected), the
system switches to RUN-Solo. The ERROR LED flashes for three seconds. The MAINT LED lights up until the RUN-
Redundant system status is reached again.
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