Quote:
Originally Posted by Al Skierkiewicz
Alan has described the wiring for this rule.
<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.
The specification on the NI 9472 module is 0.75 amps per output or 6 amps total for the module. If you are looking to just feed two solenoids in parallel from one output and the total current is less than 0.75 amps then that meets specifications. Be prepared to document this should an inspector ask.
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I have not seen in the rules or in FIRSTs or NIs documentation where the solenoid breakout or NI 9472 is called a relay. That leads me to beleive that <R42> does not apply to the solenoid breakout, even though I agree that the NI 9472 can probably handle it.
It seems like a reasonable question for Q/A.