[Al Skierkiewicz]

The NI 9472 is printed to look like a relay on the side of the module. The current limitations of the module would allow two low load solenoids to be connected to each output under the rules. That is the load of two solenoids must not exceed 0.75 amps. Since there is eight outputs, that is 6 amps total for the entire module.
This rule also applies.

<R42> Each power-regulating device (speed controller or relay module) shall control one and only one electrical load (motor, actuator or compressor).
Exception: Multiple low-load, pneumatic solenoid valves may be connected to a single relay module. This would allow one relay module to drive multiple pneumatic actions. No other electrical load can be connected to a relay module used in this manner.