9.13.5
Diagnostics via status LEDs
MT (Maintenance)
yellow
BF (Bus error)
red
Meaning
X
n
Bus error, no connection to sub net/switch
n
wrong transfer rate
n
Full-duplex-transmission is not activated
X
2Hz
n
Failure of a connected IO device
n
At least one IO device is not access-able
n
Faulty configuration
X
Maintenance event is pending.
4Hz
4Hz
The alternate blinking indicates that a firmware update of the
PROFINET IO controller is executed.
Firmware update of the PROFINET IO controller is finished
without error.
2Hz
X
With a suited configuration tool you can cause the MT LED to
blink by means of the function
‘Member blink test’
. This can be
useful for e.g. identification of the module.
not relevant: X
L/A (Link/Activity)
green
S (Speed)
green
Meaning
X
The PROFINET IO controller is physically connected to the
Ethernet interface.
X
There is no physical connection.
flickers
X
Shows Ethernet activity of the PROFINET IO controller.
The Ethernet interface of the PROFINET IO controller has a
transfer rate of 100Mbit.
The Ethernet interface of the PROFINET IO controller has a
transfer rate of 10Mbit.
not relevant: X
LEDs PROFINET IO con-
troller X8
System 300S
+
Deployment Ethernet communication - PROFINET
PROFINET diagnostics > Diagnostics via status LEDs
HB140 | CPU | 315-4PN23 | en | 18-02
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