POWER
LED
RUN/STOP LED ERROR
LED
MAINT
LED
Meaning
Startup (CPU booting)
Test of LEDs during startup, inserting a
module.
LED lit green
LED flashes
yellow/green
LED flashes red LED flashes yellow
LED flashing test
Meaning of the LINK LED
Each port has a LINK LED (LK1, LK2, LK3). The table below shows the various "LED scenarios"
of ports for the CPU1512SP‑1PN.
Table 5-2Meaning of the LEDs
LINK LED Meaning
LED off
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.
LED flashes green
The "LED flashing test" is being performed.
LED lit green
There is an Ethernet connection between the PROFINET interface of your
PROFINET device and a communication partner.
NOTE
"LED" instruction
You can read the status (e.g. "On" or "Off") of LEDs of a CPU or a module using the "LED"
instruction. Note, however, that it is not possible to read the LED status of the LINK RX/TX
LEDs on all S7-1500 CPUs.
You can find additional information on the "LED" instruction in the STEP7 online help.
27
Interrupts, error messages, diagnostics and system alarms
5.1 Status and error display of the CPU
CPU 1512SP-1 PN (6ES7512-1DM03-0AB0)
Equipment Manual, 11/2022, A5E33591411-AE
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