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Alarm, error and system messages
4.1 Status and error display of the CPU
Meaning of the RUN/STOP, ERROR and MAINT LEDs
CPU 1518HF-4 PN has three LEDs for displaying the current operating state and diagnostics
status.
Note
LED patterns of the S7-1500H redundant system
Note that it is not always possible to:
• Determine the state of the CPU from the signal pattern of individual LEDs
• Determine the state of the other CPU from the signal pattern of a CPU
The "Meaning" column only shows a possible typical cause.
To investigate the cause of the signal pattern, use the diagnostic buffer and its display via:
• STEP 7
• HMI devices
• Displays of the CPUs
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CPU 1518HF-4 PN (6ES7518-4JP00-0AB0)
Equipment Manual, 05/2021, A5E49868646-AA
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