[EricH]

I'm pretty certain it will run 2 at a time. I'm fairly certain it could run 8 at one time.

But what you're asking is if there is a way to get it to run more than 8 at one time. That's not legal, and there isn't enough oomph in the 24V supply to do it. (See EricVanWyk's post.)

Now you're looking into using a second 24V breakout. That is also illegal. <R45-A> makes it clear that only one solenoid breakout and the cRIO can go into the 24V terminals on the PDB.

Your best bet is to find a bunch of 12V solenoids and run those on a 12V breakout, or through a Spike run by the relay board.