BECKHOFF CX50x0 - Manual (Page 69)

Notes on the documentation
CX50x0 - Hardware Documentation 67
LEDs of the K-bus-power supply unit (CX50x0-1xxx)
After switching on, the power supply immediately checks the connected Bus Terminal configuration. Error-free start-
up is signaled 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
Us 24
V Power supply for the CPU module
The LED lights green if the power supply is correct.
Up
24V Power supply for terminal bus.
The LED lights green if the power supply is correct.
K-BUS
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.
K-BUS
ERR 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
flashing EMC problems  Check power supply for overvoltage or
undervoltage peaks
 Implement EMC measures
 If a K-Bus error is present, it can be lo-
calised 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. Too many entries in
the table for the programmed configuration
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 at-
tached 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.