The following table includes information on the LEDs available for an initial diagnostics and
the meaning of the LED.
LED
Meaning for PROFINET IO
Meaning for PROFIBUS DP
BUSF
Lit up in red:
Lit up in red:
Bus error (no physical connection to a sub‐
net/switch)
Bus error at interface (e.g. bus short-circuit)
Incorrect transmission rate
Full duplex transmission is not activated
Flashing:
Flashing:
The PROFINET device is a controller:
The module is a DP master:
Failure of a connected IO device
Failure of a connected station
At least one of the assigned IO devices can‐
not be addressed
At least one of the assigned slaves cannot
be addressed
Incorrect configuration
Incorrect configuration
The PROFINET device is an IO device:
The module is a DP slave:
The watchdog time has expired.
The watchdog time has expired.
Bus communication via PROFINET is inter‐
rupted.
Bus communication via PROFIBUS DP is
interrupted.
IP address is incorrect.
PROFIBUS address is incorrect.
Incorrect configuration
Incorrect configuration
Incorrect parameter assignment
Incorrect or missing device name
IO controller not available/turned off, but
Ethernet connection exists.
RX
Lit up in yellow:
Not available
Data is received via the interface.
The LED flickers when low data volumes
are transferred.
TX
Lit up in yellow:
Not available
Data is sent via the interface.
The LED flickers when low data volumes
are transferred.
LINK
Lit up in green:
Not available
Another device (most often a switch) is con‐
nected and the physical connection exists.
FO
Lit up in yellow:
Not available
End of form
The respective transmission path has to be
inspected.
Diagnostics in PCS 7
8.17 Diagnostics for hardware displays
Service Support and Diagnostics (V8.2)
Service Manual, 03/2016, A5E36200111-AA
107
