Siemens Simatic ET200pro

Interrupts, diagnostics, error messages and system events
11.1 Status and error display of the CPU
CPU 1516pro-2 PN (6ES7516-2PN00-0AB0)
116 Operating Instructions, 09/2016, A5E35873416-AA
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, i.e. 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, i.e. the LEDs do not light up immediately.
Status display 24 V DC
The 24 V DC LED lights up green when you have connected the load voltage supply 2L+. If
the LED does not light up, check whether the power supply is switched on and the fuse is
okay.
In the case of the 24 V DC LED, the CPU does not perform an "LED flash test", i.e. the LED
does not light up immediately after switching on the load voltage supply 2L+.