Siemens SIMATIC ET 200pro - Page 118

Interrupts, diagnostics, error messages and system events
11.1 Status and error display of the CPU
CPU 1516pro-2 PN (6ES7516-2PN00-0AB0)
Operating Instructions, 11/2019, A5E35873416-AC
117
Meaning of LINK RX/TX LED
X1 P1, X1 P2 and X2 P1 each have a LINK RX/TX LED (yellow/green LED). Port X1 P3 has
a LINK LED (green) and an RX/TX LED (yellow).
The table below shows the various "LED scenarios" of ports X1 P1, X1 P2 and X2 P1.
LINK RX/TX LED *
Meaning
LED off
There is no Ethernet connection between the PROFINET interface of the PROFINET device
and the communications 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 de-
vice 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.
* At startup, the CPU does not perform an LED flash test. This means that the LEDs do not light up immediately.
The table below shows the various "LED scenarios" of port X1 P3.
LINK RX/TX LED *
Meaning
Green LED and yellow LED
off
There is no Ethernet connection between the PROFINET interface of the PROFINET device
and the communications partner.
No data is currently being sent/received via the PROFINET interface.
There is no LINK connection.
Green LED flashes green
The "LED flashing test" is being performed.
Green LED lit green
There is an Ethernet connection between the PROFINET interface of your PROFINET de-
vice and a communication partner.
Yellow 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.
* At startup, the CPU does not perform an LED flash test. This means that the LEDs do not light up immediately.
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 is not possible to read out
the LED status of the
LINK
RX/TX LEDs on the CPU 1516pro-2 PN.
You can find additional information on the "LED" instruction in the STEP
7 online help.