Siemens SIMATIC S7-1500R/H

Meaning of the RUN/STOP, ERROR and MAINT LEDs
CPU1517H‑3PN has the following 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
The following table shows the meaning of the various color combinations for the RUN/STOP,
ERROR and MAINT LEDs.
Table 5-1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.
Startup (CPU booting)
Test of LEDs during startup, inserting a module.
LED flashes
yellow/green
LED flashes red LED flashes yellow
LED flashing test
CPU is in operating state STOP.
LED lit yellow LED off LED lit yellow
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.
LED flashes yellow
LED off LED off
The CPU performs a warm restart.
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 redundant
system will remain in the RUN-Redundant system state.
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CPU1517H-3PN (6ES7517-3HP00-0AB0)
Equipment Manual, 11/2022, A5E42011886-AD
Interrupts, diagnostics, error messages and system events
5.1 Status and error display of the CPU