I search for an example program, cyclic interrupt

All the threads I found discuss well documented principles as

- Basic timing

- Priority

- Error Handling

What I search for is an example program (that can be upgraded to V12) in order to see how it is implemented. In the file you can find mine.

The purpose of my program is that the user can choose the cyclic interrupt time to perform an OB3x (for example the time interval for data logging). When I analyse the timing of my program, it's not right. When I set the cyclic interrupt to 1s, the first time OB3x takes 1s. After that it always takes 2s. The pause in between always takes 1s. I believe the duration has to be the same and not a multiple of 1s.

So I expect the program to be:

If the cyclic interrupt OB takes 300ms, that every 1s (choice) the OB is called for and only takes 300ms and not a multiple of 1s influenced by the chosen time parameter.