Error handling and diagnostics
CX50x072 Version: 1.9
6 Error handling and diagnostics
6.1 Basic CPU module
6.1.1 LEDs on the basic CPU module
Display LED Meaning
PWR Power supply The Power LED
comes on when the device is
connected to a live power supply
unit (green).
TC TwinCAT status LED TwinCAT is
in Run mode (green)
TwinCAT is in Stop mode (red)
TwinCAT is in Config mode
(blue)
HDD Read/Write Compact Flash (red)
Indicates access to the CF card.
FB1 Status LED1 for fieldbus
(function is written at the fieldbus
interface)
FB2 Status LED2 for fieldbus
(function is written at the fieldbus
interface)
6.1.2 LEDs of the power supply in K-bus mode
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
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
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