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1.10 Status LEDs
The Status LEDs on the ProfiHub are very useful for diagnostics.
LED
OFF
POWER 1 / 2
Power is not
switched on or an
internal failure
READY
Power is not
switched on or an
internal failure
Fiber Link RX-OK
No communication
detected
Fiber Port ERROR
No problem has been
detected
Fiber Level
No problem has been
detected
Fiber Ring Fail
No problem has been
detected
RS 485 RX-OK
There is no
communication detected
(on this Channel)
RS485 ERROR
No problem has been
detected
RS 485 INT. TERM
Termination for this
channel is OFF
1.11 The red error LED
The red error LEDs on a channel will blink shortly if a corrupt message enters the ProfiHub. More specifically,
this can be a Parity error (the parity checksum of the byte is incorrect) or a Framing error (the FCS byte is
different than the real message). It is necessary to investigate further with an oscilloscope to find out what the
problem is. This can easily be done with ProfiTrace.
Another reason for the red error LED for channel 1 or 2 of the B2FOR+ MM/SM or channel 4 and 5 of the
B4FOR+ MM/SM is a problem in the redundant cabling (if the ProfiHub is set to redundant; rotary switch
position 2 and 5). The red error LED is ON with a problem in one or both cables and blinking If there was a
problem but now fixed. A cable redundancy alarm is pending. Press the 'Alarm Reset' button to reset the
pending Alarm. This can also be done remotely with the conformation module of the diagnostic slave (DP-V0)
or in the Diagnostic slave info WEB-page of the ComBricks Head station.
It can also be that the baudrate is not locked (no PROFIBUS master on the bus). If a baudrate has been locked
and the master disappears from the bus, the current baud rate will be unlocked after 50 seconds.
ProfiHub B2FOR+ / B4FOR+ User Manual | August 2019 | © PROCENTEC
Blinking
Power was bad, now
OK (alarm pending).
Trying to detect the
transmission speed, but
has not locked it yet
Receiving valid
PROFIBUS messages
Signal was too low,
now fixed (alarm pending)
Signal was critical,
now fixed (alarm pending)
Ring was broken, now
fixed (alarm pending)
one or more devices
communicating (on this
Channel)
Problem in the cabling
has been detected on this
Channel, see 1.11
Internal failure
ON
Power supply OK.
The transmission
speed has been detected.
Fiber connection to
next link established
Signal too low, no
connection to next link
critical signal, but
messages could still be
received
Ring is broken
one or more devices
communicating (on this
Channel)
Problem in the cabling
has been detected on this
Channel, see 1.11
Termination for this
channel is ON
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