[EricH]

Aye, but another rule specifically says no.

<R49> Each power-regulating device (speed controller or relay module) shall control one and only one electrical load (motor, actuator or compressor).
A. 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.

(emphasis mine)