Siemens Simatic S7-1500

LED display during reset
At POWER ON, the SIMATIC Drive Controller performs a reset. During the reset, all LEDs are lit
yellow (lamp test).
5.1.2 Status and error display of the CPU
Meaning of the RUN/STOP, ERROR and MAINT LEDs
The SIMATIC Drive Controller has three LEDs for displaying the current operating state and
the diagnostics status of the CPU. The following table shows the meaning of the various
combinations of colors 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.
LED off
LED flashes red
LED off
An error has occurred.
LED lit green LED off LED off
CPU is in RUN mode.
A diagnostics event is pending.
LED lit green
LED flashes red
LED off
Service data backup in RUN ended with
error.
Maintenance demanded for the plant (e.g.
Warning: CPU overtemperature).
The affected hardware must be
checked/replaced within a short period of
time.
Active Force job
LED lit green LED off LED lit yellow
OPC UA server of the CPU expects initial
trust lists and CRLs via GDS Push
function.
LED lit green LED off
LED flashes yellow
Bad configuration
LED lit yellow LED off
LED flashes yellow
Firmware update was successfully com
pleted.
CPU is in STOP mode.
LED lit yellow LED off LED off
CPU runs a program with active break
points. The program is at a breakpoint.
59
Interrupts, diagnostics alarms, error messages and system alarms
5.1 Status and error displays
SIMATIC Drive Controller
Equipment Manual, 11/2022, A5E46600370-AC