Advantech APAX-5013 User Manual page 127

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LED continues flashing 4 times every 2 seconds
Representation: ID number of that I/O module conflicts with ID number of another
I/O module
Solution: 1.
2.
Check ID number of all I/O modules in the same system.
Adjust the ID number to avoid different I/O modules with the
same ID number. Refer to Section 1.6 for how to adjust ID
number. Then reboot the system and it should work fine.
(The LED should stop flashing)
If the LED continues flashing after you have adjusted the ID
number, then you need to contact Advantech for technical
support.
119 APAX-5000 I/O Series User Manual