The ideal way would be of course to have a combined supply, you could use a zener circuit, simple, but not very efficient, (heat waster).
This would consist of a 50ohm 20w resistor from a 24vdc terminal in series with a 3v 2w zener to ground, the 3v would come off the top end of the zener and ground.
BTW all the 24vdc outputs on the supply are common to each other.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.