24v Power Conector to from the PDB to the cRIO

[Russ Beavis]

Why does the PD have 4 terminals (a pair of + and a pair of -)?

Short answer - Because the cRIO has the same 4 terminals and we wanted the PD to use the same pinout.


Then you might ask "well, why does the cRIO have a + pair and - pair?" According to the datasheets for the cRIO, its internal power supply is designed to be driven by redundant power supplies for extra ruggedness.

Many high-availability/critical applications require multiple power sources for safety/reliability. So... if you need that level of performance, you can include an extra power supply and use both to power the cRIO. The module will use whichever power supply is outputting a higher voltage. If one supply breaks, the other supply will continue to power the cRIO.

Russ