If I index to a single OTE, it will be overwritten on every index? Also I have to FTV alarm on the proper timer[x].dn bit. Maybe I'm missing something?
It will act pretty much the same as an index MOV would. If the address doesn't exist that scan (indexed to 2, 3, 4, etc) it will not modify the contents of that address.
So if [1] is set True one scan, and the next scan the index is at [2], the contents of [1] will remain unchanged until the index gets back to [1], then it will modify it true or false depending on the logic.