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How do you come to the conclusion that the aux contacts need to be operated with 24V, involving all the voltage divider stuff etc? These are separate micro switches, they can work with 3.3 V logic as well. Particularly I don't see a reason for optical isolation when the actuator circuit is operated at the common logic ground.
If you expect untrained staff confusing the device wiring, you can provide pull-up and series input resistors with 24V rating.
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As for the actuator drivers, there's no indication that the open circuit voltage is lower than 24V supply, so using driver transistors as shown in your schematic seems appropriate.
If you expect untrained staff confusing the device wiring, you can provide pull-up and series input resistors with 24V rating.
- - - Updated - - -
As for the actuator drivers, there's no indication that the open circuit voltage is lower than 24V supply, so using driver transistors as shown in your schematic seems appropriate.