FC85 FIFO Problem

[noutec74]

Hello there

I have a little question,,, I always got a problem when using function FC84, FC85 FIFO,, even I wrote everything correct & also the data in DB but when I made the trigger the PLC made System Fault,,,, could I know why the reason

I hope to have your reply soon as I need this function in my project

[Guille]

it is not easy to guess what is going on, probably the fc is reading or writing to a not existent nemory area...
Check the diagnostic buffer to see why the plc go to stop.