BECKHOFF BK4000 - Manual (Page 16)

Basic information
16 BK4000
Starting operation and diagnostics
After power-on, the bus coupler immediately checks the connected confi-
guration. Error-free startup is signalled by extinguishing of the red „I/O ERR
„ LED. 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. This enables swift troubleshooting.
The diagnostic LEDs The bus coupler has two groups of LEDs to provide a status indication. The
top group with four LEDs indicates the status of the respective InterBus
system. The meanings of the „Field bus status LEDs“ are explained in the
corresponding chapters of this manual. These correspond to the usual field
bus displays.
There are two further green LEDs on the top right hand side of the bus
coupler to indicate the supply voltage. The left LED indicates the 24V po-
wer supply of the bus coupler. The right LED signals the supply to the Po-
wer contacts.
Local errors Two LEDs, the „I/O-LEDs“, in the area under the aforementioned field bus
status LEDs, serve to indicate the operating states of the bus terminals and
connection to these bus terminals. The green LED lights up to indicate
error-free operation. Error-free means that communication with the field
bus system is also running without errors. To indicate errors, the red LED
flashes at two different frequencies. Errors are coded in the flashing code
as follows:
Flashing code fast flashing Start of the error code
first slow sequence Error code
second slow sequence Error argument
Errors
Error code Error argument Description
1 pulse 0
1
2 EEPROM checks on error
Inline code buffer overflow
Unknown data type
2 pulses
0
n (n > 0) Programmed configuration
Invalid table entry / bus coupler
Table comparison (terminal n) invalid
3 pulses 0 Terminal bus command error
4 pulses 0
n Terminal bus data error
Breakage after terminal n (0: coupler)
5 pulses n Terminal bus error during register communica-
tion with terminal n
6 pulses 0
n (n > 0) More than 32 words data width fitted on the bus
coupler
Error location
The number of pulses in the error segment indicates the position of the last
bus terminal before the error. Passive bus terminals such as a supply ter-
minal without diagnostics are not counted.
The bus coupler does not end the flashing sequence when the error is
remedied. The bus coupler’s operating state is still „Stop“. The bus coupler
can only be restarted by switching off and switching on the supply voltage.
It is only permitted to remove and instert bus terminals from the network in
the deactivated state. The electronic circuitry of the bus terminals and of
the bus coupler is largely protected against destruction, but malfunctions
and damage cannot be ruled out when they are plugged together under
voltage.