URGENT! I/O bus error [Code 0]

[balazs.tarro-HUN]

Hi everyone!

I have an urgent issue to solve 🫤

In one of my working project a new issue has appeared with the following error message:

I/O bus error [Code 0]

After a reboot the PLC working fine for about 10-15 minutes and the error appears again. Let me show the PLC I/O configuration :

 

I have just replaced the UAG-XKP300 (beetween the PLC and first row IOs) with a brand new one. Started the machine and it works fine...for about 15-20 minutes. The same error appears!

I've checked the IOs and all of it blinks red slowly, except one of its! UID-0808THS (number #18 IO modul, after the second UAG-XKP300) blinks red rapidly. 

Now I try to change the second UAG with a new one. 

 

But before error appears again, does anybody have any idea what to do? Try to change CPU ? What does error 0 mean?

 

Thank you! Unfortunately it is really important and should solve quickly 

🤞

Best regard,

Balazs

[dierkens]

I'd create new projects and test each I/O section.   

Create one that only has the original block of I/O and test it.

Create another one that just has the original block and the 2nd (long) block of I/O.

Create a third one that has the original block and the 3rd (short) block of I/O.

That should tell you if each piece is operational and it shouldn't take that long to do it.

 

 

[walle]

 

Balazs,

Were you able to resolve this?  I am showing the same reoccurring error on one of our PLC s
Running firmware 1.36_63 
Not nearly as many cards as your program
Wondering if it ended up being hardware or software related

Thanks