Renishaw TP-20 Probe Connection

I know just enough electronics to be dangerous, so I would rather not advise.
I don't know if you can just connect a PNP transistor to the +V rail and still have it driven by the op-amp output as shown.

This might help:
electronicsclub.info/transistorcircuits.htm

Based on that I think it would probably work to just move the transistor and swap the type. Breadboard it first?

a while ago i checked the renishaw PI4 probe interface unit - it supplies the probe with 12V limited to 0.5mA. so i think some circuit with a comparator before the optoisolated machine input would be a good idea...

Thanks to both for the info there, thats interesting that it supplies 12v.

I think I have found a way to do this, which actually was quite easy, I still need to actually test this circuit however!

Using the circuit shown here - electronics.stackexchange.com/questions/...g-5v-microcontroller

I have attached my revised circuit that should trigger the 24v input with the same transistor.

Yes, that should work, but why not run the whole circuit off of 24V? It just needs a higher-voltage op-amp and making R4 proportionally bigger.