As Frank pointed out there is a legal issue here.
Quote:
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<R51> Each power regulating device may control electrical loads per Table 4-4. Unless otherwise noted, each power regulating device may control one and only one electrical load.
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As I read it the rules are a little fuzzy, though. This is sort of lawyering but, because the breakout isn't exempted from the 'one and only one electrical load' part, strictly speaking <R51> would preclude attaching more than one solenoid (or any electrical load) to each breakout board. We know this not the intent or common interpretation, and the addition of the solenoid module/breakout board as a power regulating device wasn't made till the Valentines day team update. The table should
probably make a specific allowance that the breakout board can control one load per channel
and/or specify a maximum load for each channel. Note that <R69> already defines the maxium cumaltive load when powered by the 24v supply (16 or 21 watts, depending on C-rio type).
In any case, there's not much advantage in ganging multiple solenoids to one channel. Enabling multiple channels on the breakout board at the same time is trivial to do in programming and gives you far more flexibility. If you're out of outputs on the breakout you're also probably pushing the wattage limit defined in <R69>; not great for legal and technical reasons.
If you
really want to run multiple solenoids off a single 'output', you can gang multiple pneumatic relays off a single Spike relay. This requires the use of 12v solenoids, obviously, but it is explicitly allowed for in the rules.