Siemens Simatic S7-1500 Manual page 121

Meaning of the LED displays
The following tables explain the meaning of the status and error displays.
RUN/ERROR LED
Table 6- 5 RUN/ERROR status and error displays
LED
RUN ERROR
Off Off
Flashes Off
On Off
On Flashes
PWRx LED
Table 6- 6 PWRx status display
PWRx LED
Off
On
CHx LED
Table 6- 7 CHx status display
CHx LED
Off
On
CPU 1512C-1 PN (6ES7512-1CK00-0AB0)
Manual, 09/2016, A5E35306440-AB
Meaning
No voltage or voltage too low
Digital on-board I/O starts up.
Digital on-board I/O is ready for operation.
A diagnostics interrupt is pending. Supply volt-
age missing.
Meaning
Supply voltage L+ to module too low or missing Check supply voltage L+.
Supply voltage L+ is present and OK.
Meaning
0 = Status of the input/output signal.
1 = Status of the input/output signal.
Interrupts/diagnostics alarms
6.1 Status and error displays
Remedy
Turn on the CPU.
•
Check whether too many modules are in-
•
serted.
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Check supply voltage L+.
Remedy
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Remedy
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