BECKHOFF BK2000 - Manual (Page 15)

Basic information
BK2000 15
Starting operation and diagnostics
The bus coupler immediately checks the connected configuration after
switching on. An error-free startup is indicated by the fact that the red "I/O
ERR" LED goes off. Flashing of the "I/O ERR" LED indicates an error in the
area of the terminals. The error code can be determined by the frequency
and quantity of flashing, thus enabling swift troubleshooting. You will find a
detailed description in the chapter entitled "The diagnostic LEDs".
The diagnostic LEDs The bus coupler has a status display consisting of two groups of LEDs.
The upper group has four LEDs which indicate the mode of the installed
fieldbus. The significance of these “fieldbus status LEDs” is explained in
the appropriate chapters of this manual; they correspond to the usual
displays for fieldbuses.
There are two more green LEDs at the top right-hand side of the bus
coupler to indicate the supply voltage. The left-hand LED shows the 24V
supply of the bus coupler. The left-hand LED shows the supply to the
power contacts.
Local errors Two LEDs, the “I/O LEDs”, which are situated below the fieldbus status
LEDs described above, are used to display the operating mode of the bus
terminals and the connection to these bus terminals. The green LED lights
up to indicate error-free operation, where “error-free” implies that
communication with the fieldbus system is also operating correctly. The red
LED flashes at two different rates to indicate a fault, whereby the specific
error is encoded in the pattern of flashes, as follows.
Code of flashes
Rapid flashing Start of the error code
First slow sequence Type of error
Second slow sequence Location of error
Type of error
1 flash
2 flashes
3 flashes Connection to the bus terminals cannot be set up
correctly
4 flashes Break in the K-bus
Location of error
The number of pulses indicates the last bus terminal before the error.
Passive bus terminals, for example an infeed terminal, are not counted.
The bus coupler does not end the flashing sequence when the error is
remedied. The bus coupler's operating state: "Stop". The bus coupler can
only be restarted by switching off the supply voltage.
Fieldbus errors The field bus status LEDs indicate the operating states of the field bus. The
functions of the Beckhoff-Lightbus are reflected by the "CYC", "ERR" and
"WD" LEDs. The fourth LED is irrelevant.
The meanings of the first three LEDs:
CYC The LED lights up during the length of each telegram.
ERR is activated in the event of an errored telegram and is deactivated
again after three error-free telegrams
WD Watchdog, which lights up for 100ms after addressing of the bus
coupler