BECKHOFF BK3000 - Manual (Page 20)

Basic information
20 BK3xxx/LC3100
BF
1 pulse 0
n (n>0) Not enough DP-Cfg data received
Faulty DP-Cfg data byte
Profibus configuration data
error
LC3100 only
2 pulses 0
n (n>0) Not enough User-Prm data received
Faulty User-Prm data byte
The number of flashes corresponds to the position of the last bus terminal
before the error, not counting passive bus terminals such as power input
terminals.
The bus coupler will carry on flashing the error code even when you have
cleared the fault and its operating mode will remain at "Stop”. The only way
to restart the bus coupler is by switching the power supply off and on
again.
You should not plug or unplug bus terminals from the series without first
turning off the power. The circuitry of the bus terminals and the bus coupler
is largely protected against damage, but if you modify the assembly while it
is under power, malfunctions and damage cannot be ruled out.
If a fault occurs during normal operation, the error code will not be output
on the LEDs until the bus coupler has been requested to diagnose the bus
terminals. This diagnostic request is generated after the equipment is
switched on.
The fieldbus status LEDs indicate the current operating mode of the
fieldbus. The functions of the Profibus are shown by the LEDs "RUN”, "BF”
and "DIA”; the fourth LED has no significance.
i
Note
Please note that there is an association between the green I/O LED and
the fieldbus. The I/O LED lights up when access is made to the internal K
bus. The green I/O LED is not lit until data begins to be exchanged via the
fieldbus, because the Profibus initiates a new data exchange on the K bus
each time it accesses the bus coupler, which means that the fieldbus has
to access the bus coupler.
The bus coupler does, however, interrogate the configuration of the bus
terminals after power on and does not exchange any data with the
terminals. That is to say, the red I/O LED goes off after an error-free start
up without the green I/O LED having to light up. Then, the green I/O LED
does not light up until data exchange is begun via the field bus.
If a terminal bus error occurs during operation, the procedure followed
conforms to the reaction to the terminal bus errors parameterisation. If the
terminal bus error already occurs during start up, the slave does not
assume DP data transfer (Diag remains set).