Question about finding error.

Good morning,

I came across an error and I found it after looking very hard, is there a way to go to where the DW is being called from the diagnostic buffer? Access address 1616 which could be an easy way to get to the FB where is being called from?

If you can accept that the CPU goes to STOP mode, then delete OB121 in the CPU.
When the CPU stops, you can choose the "Stacks" and you will find a lot of useful information. If you use the "Open Block" button, it will take you straight to the place in the program that causes the error.

Thanks as it turned out we couldn't have the CPU on stop mode, but I will keep that in mind.

If you have PLCSIM you could try to recreate the error, and allow the simulated program to stop to find the cause.