Siemens CM 1542-1 Operating Instructions Manual page 20

LEDs
LED flashing green
LED flashing green
Meaning of the LED displays of the PROFINET ports: X1 P1 / X1 P2
To signal whether a connection exists and data is being transferred each port has a two-
color LED (green/yellow):
● X1 P1 LINK/ACT
● X1 P2 LINK/ACT
The following table shows the meaning of the various color combinations of the LEDs X1 P1
and X1 P2.
Table 2- 2
flashing green
20
RUN/STOP ERROR
LED lit green LED lit red
LED lit green LED off
LED lit green
LED flashing red
LED lit green LED off
LED lit green LED off
LED lit green
LED flashing red
LED off
LED flashing red
Meaning of the LEDs
X1 P1 LINK/ACT /
X1 P2 LINK/ACT
green off yellow off
yellow off
green on yellow off
green on yellow flickers
MAINT
CM startup
LED off
CM is in RUN mode. No disrup-
tions.
LED off
A diagnostics event has occurred.
LED off
Maintenance is demanded.
LED lit yellow
•
LED flashing yellow
•
- Duplicate IP address detected.
Ethernet interface unreachable.
•
LED off
•
Module fault
(LEDs flashing synchronized)
LED flashing yellow
Meaning
No connection to PROFINET
There is no Ethernet connection between the Ethernet
interface of the CM and the communications partner. At
the current time, there is no data being received/sent via
the Ethernet interface.
The "node flash test" is being performed.
Connection to PROFINET exists
There is an Ethernet connection between the Ethernet
interface of the CM and a communications partner.
At the current time, data is being received/sent via the
Ethernet interface of the Ethernet device of a communica-
tions partner on Ethernet.
Operating Instructions, 07/2019, C79000-G8976-C355-04
Meaning
Maintenance is required
Downloading the user program
No CM configuration exists
Loading firmware
CM 1542-1