Siemens CPU 1518HF-4 PN, Equipment Manual

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Alarm, error and system messages
4.1 Status and error display of the CPU
CPU 1518HF-4 PN (6ES7518-4JP00-0AB0)
Equipment Manual, 05/2021, A5E49868646-AA
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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
RUN/STOP LED ERROR LED MAINT LED Meaning
LED off LED off LED off
Missing or insufficient supply voltage on the CPU.
LED flashes
yellow/green
LED flashes red LED flashes yellow
Startup (CPU booting)
Test of LEDs during startup, inserting a module.
LED flashing test
LED lit yellow LED off LED lit yellow
CPU is in operating state STOP.
Completion of system initialization
LED flashes yellow
LED off LED lit yellow
CPU executes internal activities in an operating
state ≠ RUN-Redundant.
LED lit yellow
LED flashes red LED flashes yellow
CPU defective
Firmware update using SIMATIC Memory Card has
failed.
LED lit yellow LED off
LED flashes yellow
Firmware update successfully completed.
LED flashes
yellow/green
LED off LED lit yellow
The primary CPU is in STARTUP operating state.
The backup CPU is in SYNCUP operating state.
The backup CPU has not yet been restarted for
SYNCUP during this phase.
LED flashes yellow
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 the RUN or RUN-Syncup
operating state.
Active Force job
Warning limit for F-cycle violated
Safety mode deactivated
LED lit green LED off LED off
The CPU is in RUN-Redundant operating state.
There are no events, requirements, errors, etc.
LED lit green
LED flashes red
LED off
A diagnostic event is pending in RUN-Redundant
operating state.
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 maintenance is de-
manded (e.g. interruption of the PROFINET ring).
1)
If there is not enough storage space on a SIMATIC Memory Card or on both SIMATIC Memory Cards in RUN-Redundant,
the write function is aborted and the redundant system continues operation with the original configuration. The redun-
dant system will remain in the RUN-Redundant system state.