Siemens Simatic S7-1500 CPU 1512C-1 PN User Manual page 129

RUN/STOP LED
LED flashes
yellow/green
Meaning of LINK RX/TX LED
Each port has a LINK RX/TX LED. The table below shows the various "LED scenarios" of
the CPU ports.
Table 6- 2 Meaning of the LED
LINK TX/RX LED
LED off
LED flashes green
LED lit green
LED flickers yellow
Meaning of the STOP ACTIVE LED
The following table shows the meaning of the STOP ACTIVE LED for the CPU 1512C-1 PN.
Table 6- 3 Meaning of the LEDs
STOP ACTIVE LED
LED lit yellow
LED off
CPU 1512C-1 PN (6ES7512-1CK01-0AB0)
Manual, 12/2017, A5E40898741-AA
ERROR LED
LED flashes red LED flashes yellow
There is no Ethernet connection between the PROFINET interface of the PROFINET device
and the communication partner.
No data is currently being sent/received via the PROFINET interface.
There is no LINK connection.
The "LED flashing test" is being performed.
There is an Ethernet connection between the PROFINET interface of your PROFINET de-
vice and a communication partner.
Data is currently being received from or sent to a communications partner on Ethernet via
the PROFINET interface of the PROFINET device.
The CPU is switched to "STOP" mode using the STOP button.
As long as the STOP ACTIVE LED is lit up, switching the CPU to RUN mode is only
•
possible using the RUN button.
The CPU can then no longer be set to RUN mode via the display operation or via online
•
functions. The state of the buttons is retained at power-off. If the CPU does not start up
automatically after a power-on, you have to keep the STOP button pressed during start-
up until the STOP ACTIVE LED is activated.
If an automatic start-up is to be reliably prevented after a power-up, the STOP button has
•
to be kept pressed during the start-up of the CPU until the STOP ACTIVE LED is activat-
ed.
The CPU is set to "STOP" mode using the display or programming device and not with
•
the STOP button on the device.
The CPU is in RUN mode.
•
MAINT LED
Startup (CPU booting)
Test of LEDs during startup, inserting a module.
LED flashing test
Meaning
Meaning
Interrupts/diagnostics alarms
6.1 Status and error displays
Meaning
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