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Error handling and diagnostics
CX51x0 77 Version: 2.8
9 Error handling and diagnostics
9.1 Diagnostic LEDs
Display LED Meaning
PWR Power supply
The Power LED comes on (green) when the device is connected to a live power
supply unit.
Bootloader is started and runs without errors (the colors red and yellow light up
for one second).
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 CFast card
(red) Indicates access to the CFast card.
FB1 Status LED1 for fieldbus (the function is described under the fieldbus interface)
FB2 Status LED2 for fieldbus (the function is described under the fieldbus interface)
9.1.1 K-bus
The power supply unit checks the connected Bus Terminals for errors. The red LED "K-bus ERR" is off if no
error is present. The red LED "K-bus ERR" flashes if Bus Terminal errors are present.
Table 34: Diagnostic LEDs in K-Bus mode.
Display LED Meaning
Us 24 V Power supply for basic 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 Diagnostic K-bus. The green LED lights up in order to indicate
fault-free operation. "Error-free" means that the communication
with the fieldbus system is also running.
K-BUS ERR Diagnostic K-bus. The red LED flashes to indicate an error. The
red LED blinks with two different frequencies.
The frequency and number of the flashes can be used to determine the error code and the error argument.
An error is indicated by the "K-bus ERR" LED in a particular order.
Table 35: K-bus ERR LED, fault indication sequence through the LED.
Order Meaning
Fast blinking Starting the sequence
First slow sequence Error code
No display Pause, the LED is off
Second slow sequence Error code argument
Count how often the red LED K-bus ERR flashes, in order to determine the error code and the error
argument. In the error argument the number of pulses shows the position of the last Bus Terminal before the
error. Passive Bus Terminals, such as a power feed terminal, are not included in the count.