BECKHOFF BK2000 - Manual (Page 16)

Basic information
16 BK2000
BK2000 diagnostic LEDs
Attention must be paid to the fact that there is a connection between the
green I/O LED and the field bus. The I/O LED lights up in connection with
access to the internal K-bus. The green I/O LED does not light up until a
trigger begins via the field bus. This means that the field bus must access
the bus coupler and the controller software must clear a cyclical trigger.
The green I/O LED indicates access to the internal K-bus and is reset after
100 ms.
The bus coupler queries the configuration of the bus terminals after
switching on and does not exchange data with the terminals. That is to say,
the red I/O LED goes off after an error-free startup without the green I/O
LED having to light up. The green I/O LED does not light up until data
exchange is begun via the Beckhoff-Lightbus.
CYC ERR WD Meaning Remedy
lit off lit Cyclic telegrams are passing via the ring.
Inputs are read and outputs are set.
off flashing off Occasional CRC error (green I/O LED lit)
Inputs are read; outputs are not updated. Fiber-optic connection damaged
off lit off Bus error (physical). Errored telegrams
are passing through the ring, e.g. fiber-
optic line damaged or previous module
malfunctioning, connector not inserted
correctly. Check:
whether the fiber-optic cable is inserted
whether the fiber-optic cable has a
discontinuity
whether previous units are operable.
off off off No operating voltage, severe error; no
functioning
flashing off off The controller is only occasionally
accessing the bus. The outputs drop out. Revise the controller software
lit off off The ring is functioning, but the bus
coupler is not addressed. Revise the controller software or
allocation list
lit off lit I/O RUN is not lit, the bus terminal is
addressed, but the data exchange via the
K-bus has not been started. Add the trigger call to the controller
software