FIFO in RSLogix 5000, help needed

Hello Friends

I need to save 2 tags (String and DINT) in a FIFO of 10 elements.

When a programmed condition is true, this 2 tags should enter to the FIFO and the last element should go out (garbage). So, just 10 element should be in the FIFO.

I have done some tries with FFL and FFU instructions but without sucess.

Also, I have try to save just a tag (DINT), but without sucess. I have could save the values in the FIFO, but I am not sure how to displace the elements.

Somebody could help me?

Thanks in advance.