Siemens Simatic S7-1500 CPU 1512C-1 PN - Page 133

Interrupts/diagnostics alarms
6.1 Status and error displays
CPU 1512C-1 PN (6ES7512-1CK01-0AB0)
Manual, 12/2017, A5E40898741-AA
133
Meaning of the LED displays
The following tables explain the meaning of the status and error displays.
RUN/ERROR LED
Table 6- 6 RUN/ERROR status and error displays
LED
Meaning
Remedy
RUN
ERROR
Off Off
No voltage or voltage too low
• Turn on the CPU.
• Check whether too many modules are in-
serted.
Flashes
Off
Digital on-board I/O starts up.
---
On Off
Digital on-board I/O is ready for operation.
On
Flashes
A diagnostics interrupt is pending. Supply volt-
age missing.
Check supply voltage L+.
PWRx LED
Table 6- 7 PWRx status display
PWRx LED
Meaning
Remedy
Off
Supply voltage L+ to module too low or missing Check supply voltage L+.
On
Supply voltage L+ is present and OK. ---