BECKHOFF BK7000 - Manual (Page 16)

Basic information
15 BK 7000
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.
Fieldbus errors The fieldbus status LEDs A and B indicate the current ControlNet bus
status of the corresponding channel. The other two LEDs are reserved for
the future.
Priority indicator state how to view cause
Highest
(1)
both steady off viewed together reset or no power
2 both steady red viewed together failed link interface
3 alternating red /
green viewed together self test
4 alternating red /
off viewed together bad node configuration (such as duplicate MAC ID)
5 steady off viewed independently channel disabled or channel not supported
6 flashing red /
green viewed independently invalid link configuration
7 flashing red / off viewed independently link fault or no MAC frames received
8 flashing green /
off viewed independently temporary channel error, or listen-only
Lowest
(9)
steady green viewed independently normal operation
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.
The bus coupler does, however, interrogate the configuration of the bus
terminals after power on and does not exchange any data with the termi-
nals. 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 transfer is begun via the field bus.
If a terminal bus error occurs during operation, the procedure followed con-
forms to the reaction to the terminal bus errors parameterisation. If the
terminal bus error already occurs during start up, the slave does not assu-
me ControlNet data transfer.