Error handling and diagnostics
42 Embedded PC
LEDs Basic CPU-module (K-Bus)
Display LED Meaning
red TwinCAT is in STOP mode
green TwinCAT is in RUN mode
blue TwinCAT is in CONFIG mode
PWR
off System is offline
LAN 1 LAN Link , (green)
LINK/ACTIVITY for first switched LAN PORT (CX9000_N000)
LAN 2 LAN Link, (green)
LINK/ACTIVITY for second switched LAN PORT (CX9000_N000)
K-Bus flashes in traffic on K-bus / reports errors
K-Bus not active (off)
K-Bus running (flashes green)
K-Bus error (red) see tables below
HDD Read/Write Compact Flash (red)
Indicates access to the CF card.
The I/O error K-Bus LED blink code
Fast blinking Start of the error code
First slow sequence
Error code
Second slow sequence
Error code argument
LEDs for K-Bus diagnosis
Error code
Error
code
argument
Description Remedy
Persistent,
continuous
blinking
EMC problems
- Check power supply for overvoltage or undervoltage
peaks
- Implement EMC measures
- If a K-Bus error is present, it can be localised by a
restart of the power supply (by switching it off and then
on again)
0 EEPROM checksum error Revert to the manufacturer’s setting
1 Code buffer overflow
Insert fewer Bus Terminals. The programmed
configuration has too many entries in the table
1 pulse
2 Unknown data type Software update required for the power supply
0
Programmed configuration
has an incorrect table entry
Check programmed configuration for correctness
2 pulses
n (n > 0)
Table comparison (Bus
Terminal n)
Incorrect table entry
3 pulses
0 K-Bus command error
- No Bus Terminal inserted
- One of the Bus Terminals is defective; halve the
number of Bus Terminals attached and check whether
the error is still present with the remaining Bus
Terminals. Repeat until the defective Bus Terminal is
located.
0
K-Bus data error, break
behind the power supply
Check whether the n+1 Bus Terminal is correctly
connected; replace if necessary.
4 pulses
n Break behind Bus Terminal n
Check whether the Bus End Terminal 9010 is
connected.
5 pulses
n
K-Bus error in register
communication with Bus
Terminal n
Exchange the nth bus terminal
0
Checksum error in Flash
program
Revert to the manufacturer’s setting
9 pulses
n (n>0)
Bus Terminal n is not
consistent with the
configuration that existed
Revert to the manufacturer's setting which will clear the
boot project.
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