Siemens SIMATIC S7-1500R/H Manual page 34

Interrupts, diagnostics, error messages and system events
5.1 Status and error display of the CPU
LINK TX/RX LED
Flashes green
Illuminated green
LED flashes
yellow/green
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 R/H CPUs.
You can find additional information on the "LED" instruction in the STEP 7 online help.
Meaning of STOP-ACTIVE LED
The following table shows the meaning of the STOP-ACTIVE LED of the CPU 1515‑2 PN.
Table 5-3 Meaning of the LED
STOP-ACTIVE LED
LED lit yellow
LED off
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The CPU performs an LED flash test.
There is an Ethernet connection between the PROFINET interface of your PROFINET device and
a communication partner.
Data is currently being received/sent by a communication partner in Ethernet via the PROFINET
interface of the PROFINET device.
Note that the human eye perceives this LED image as an LED that is lit yellow or flickering yel­
low.
The CPU has been switched to STOP mode using the STOP button.
• As long as the STOP-ACTIVE LED is lit, switching the CPU to RUN mode is only possible using
the RUN button.
• The CPU can then no longer be put into RUN mode by an operator input on the display or via
online functions. The state of the buttons is retained at power-off. If the CPU is not to start up
automatically after power-on, you must keep the STOP button pressed during startup until
the STOP-ACTIVE LED is activated.
• If an automatic startup after power-on is to be reliably prevented, the STOP button must be
kept pressed during startup of the CPU until the STOP-ACTIVE LED is activated.
• The CPU has been put into STOP mode via the display or programming device/PC and not
using the STOP button on the device.
• The CPU is in RUN mode.
Meaning
Meaning
CPU 1515R-2 PN (6ES7515-2RN03-0AB0)
Equipment Manual, 11/2022, A5E42009914-AD