Hi dYoast, thanks for the link. It's very similar to what I found in the Help Files. I'm wondering if this instruction isn't meant to be used with the PLCs, but rather with iFix/Process Systems; I've come across other instruction blocks that I could technically bring into my ladder logic, but it wasn't actually meant to be used there...very frustrating, PME is just so bizarre because it has all these instructions in the tool box but so many of them don't seem to be compatible with the PLCs. Can't wait to get this project in the rear view mirror.
In the end I created a manual totalizer that looks at the GPM flow and divides it by 12; every 5 seconds, that fractional flow is added to a register and when the register is over 1,000 it increments another register and deals with whatever "overflow" there is. Works well enough, but it takes 11 lines of logic for each totalizer. I could try to put it into a UDFB but I've already gotten burned by that process so I'm wary, and I just want the project done so I'm done experimenting.