BECKHOFF CX1020 - Manual (Page 107)

Error handling and diagnostics
Embedded PC 105
CX1100-0002 power supply LEDs
After switching on, the power supply immediately checks the connected Bus Terminal configuration. Error-free start-
up is signalled by the red "I/O ERR” LED being extinguished. If the ”I/O ERR" LED blinks, an error in the area of the
terminals is indicated. The error code can be determined from the frequency and number of blinks. This permits rapid
rectification of the error.
Display LED Meaning
Power Power supply
The LED lights up green when the power supply is correct, but red if there is a short
circuit.
I/O
Run K-Bus diagnostics
The green LED lights up in order to indicate fault-free operation. "Fault-free" means
that the communication with the fieldbus system is also running.
I/O
Error K-Bus diagnostics
The red LED flashes to indicate an error. The red LED blinks with two different
frequencies.
The I/O error 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)
1 pulse 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
2 Unknown data type Software update required for the power
supply
2 pulses 0 Programmed configuration
has an incorrect table entry Check programmed configuration for
correctness
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.
4 pulses 0 K-Bus data error, break
behind the power supply Check whether the n+1 Bus Terminal is
correctly connected; replace if necessary.
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