We are limited to a single solenoid breakout running on 24v.
That's to avoid undue voltage draw on the limited 24v power supply.
Quote:
4.1.8.10 R43
The cRIO power input must be connected to the 24VDC supply terminals on the PD Board shown in Figure 4-8.
With the exception of one Solenoid Breakout Board, no other electrical load can be connected to these terminals.
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You can have a second solenoid module/breakout running at 12v.
You just have to purchase 12v solenoids for the extras that you need. AndyMark
offers some.
Spikes are also still legal for 12v solenoids.
Another option is to use some single solenoids if the application allows for it.
That effectively doubles the number of solenoids that the 24v solenoid breakout can handle.