Siemens CPU 1511-1 PN, Manual

Page: 26 / 40

Interrupts, diagnostics, error, and system messages
4.1 Status and error display of the CPU
CPU 1511-1 PN (6ES7511-1AK00-0AB0)
26
Manual, 01/2013, A5E31264526-AA
Meaning of the RUN/STOP, ERROR and MAINT LED
CPU 1511-1 PN has three LEDs to signal the current operating status and diagnostic status.
The following table shows the meaning of the various combinations of colors for the
RUN/STOP, ERROR and MAINT LEDs.
Table 4- 1 Meaning of the LEDs
RUN/STOP LED ERROR LED MAINT LED Meaning
LED off LED off LED off
Missing or insufficient power supply on
the CPU.
LED off LED flashes red LED off
An error has occurred.
LED green LED off LED off
CPU is in RUN mode.
LED green LED flashes red LED off
A diagnostic event is pending.
LED green LED off LED yellow
Maintenance demanded for the plant.
The affected hardware must be replaced
within a short period of time.
Maintenance required for the plant.
The affected hardware must be replaced
within a reasonable time period.
LED green LED off LED flashes
yellow
Firmware update successfully
completed.
LED yellow LED off LED off
CPU is in STOP mode.
The program on the
SIMATIC memory card is causing
an error.
LED yellow LED flashes red LED flashes
yellow
CPU defective
CPU is performing internal activities
during STOP, e.g. ramp-up after STOP.
LED flashes
yellow
LED off LED off
Loading the user program
LED flashes
yellow/green
LED off LED off
Startup (transition from RUN → STOP)
Startup (CPU booting)
Test of LEDs during startup,
inserting a module.
LED flashes
yellow/green
LED flashes red LED flashes
yellow
LED flashing test