BECKHOFF BC3100 - Manual (Page 16)

Basic information
16 BC3100
Local errors Two LEDs, the "I/O Leds" in the area under the above-mentioned field bus
status LEDs, serve to indicate the operating states of the bus terminals and
of the connection to these bus terminals. The green LED lights up
whenever the signals to the terminals are being exchanged via the K-bus.
After an error-free start up of the bus terminal controller, the K-bus
exchange always takes place, even if the PLC program or the field bus is
not running. The reaction (inputs or outputs change to zero or remain
unchanged) to errors (field bus not running correctly or PLC task has
assumed the STOP state) can be set via the configuration interface. To
indicate errors, the red LED flashes at two different frequencies. Errors are
encoded as follows in the flashing code:
Fast flashing Start of the error code
First slow sequence Error code
Second slow sequence Error argument
Error code Error argument Description
1 pulse 0
1
2 EEPROM checksum error
Inline code buffer overflow
Unknown data type
2 pulses
0
n (n > 0) Programmed configuration
Invalid table entry/
Bus terminal controller
Invalid table comparison (terminal n)
3 pulses 0 Terminal bus command error
4 pulses 0
n Terminal bus data error
Breakage after terminal n (0: BC3100)
5 pulses n Terminal bus error during register
communication with terminal n
6 pulses 0
p(p>0) Not enough DP-Cfg_Data received
Invalid DP-Cfg_Data byte
8 pulses 0
p(p>0) Not enough DP-User_Prm_Data received
Invalid DP-User_Prm_Data byte
9 pulses 0
Invalid checksum in the
PLC program
The number of pulses (n) indicates the position of the last bus terminal
before the error. Passive bus terminals, for example an infeed terminal, are
not counted.
In the case of some errors, the bus terminal controller does not end the
flashing sequence when the error has been remedied. The bus terminal
controller's operating state is still "Stop". The bus terminal controller can
only be restarted by switching the supply voltage off and on or by means of
a software reset.
It is only permitted to unplug bus terminals from the network and to plug
them in again after switching off. The electronic circuitries of the bus
terminals and of the bus terminal controller are largely protected against
destruction, but malfunctions and damage cannot be ruled out if terminals
are plugged together under a live voltage.
The occurrence of an error during ongoing operation does not immediately
trigger output of the error code via the LEDs. The bus terminal controller
must be prompted to diagnose the bus terminals. The diagnostic request is
generated after power on.