Siemens CPU 1518-4 PN/DP ODK - Page 35

Interrupts, error messages, diagnostics and system alarms
4.1 Status and error display of the CPU
CPU 1518-4 PN/DP ODK (6ES7518-4AP00-3AB0)
Manual, 09/2016, A5E35681108-AA
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Meaning of LINK RX/TX LED
Each port has a LINK RX/TX LED. The table below shows the various "LED scenarios" of
ports for the CPU 1518-4 PN/DP ODK.
Table 4- 2 Meaning of the LEDs
LINK TX/RX 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.
LED flickers yellow
Data is currently being received from or sent to a communications partner
on Ethernet via the PROFINET interface of the PROFINET device.