Basic information
BK 7000
14
Starting operation and diagnostics
When the bus coupler is first switched on it at once checks the attached
configuration. A correct start-up procedure is indicated by the red LED "I/O
ERR” going out. If this LED flashes, this indicates a fault somewhere in the
terminals. You can determine the actual error code by observing the speed
of flashing and number of flashes. This will enable you to clear the fault
quickly. You will find a detailed description in the chapter "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 dis-
plays for fieldbuses.
There are two more green LEDs at the top right-hand side of the bus cou-
pler to indicate the supply voltage. The left-hand LED shows the 24V sup-
ply 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 commu-
nication 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
Error
Error co-
de
Error argument
Description
1 pulse
0
1
2
EEPROM checksum error
I/0 line buffer overflow
Unknown data type
2 pulses
0
n (n > 0)
Programmed configuration
Invalid table entry/bus coupler
Invalid table comparison (terminal n)
3 pulses
0
Terminal bus command error
4 pulses
0
n
Terminal bus data error
Rupture point after terminal n (0: coupler)
5 pulses
N
Terminal bus error during register commu-
nication with terminal n
>= 6 pulses
ControlNet specific, will be described later
in this document
Location of error
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.
