Siemens SIMATIC S7-1500R Equipment Manual page 31

Interrupts, diagnostics, error messages and system events
4.1 Status and error display of the CPU
Meaning of the RUN/STOP, ERROR and MAINT LEDs
CPU 1513R-1 PN has three LEDs for displaying the current operating state and diagnostics
status.
Note
LED patterns of the redundant system S7 1500R
Note that it is not always possible to:
• Determine the state of the CPU from the signal pattern
• Determine the state of the other CPU from the signal pattern
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 1513R-1 PN (6ES7513-1RL00-0AB0)
Equipment Manual, 05/2021, A5E42009333-AC