Thank you @Wimberleytech
My board has two 0..10V output. One is connected to a motor inverter, this one is isolated. The other unluckly is connected to a magnetic powder controller, this last controller is not isolated.
Unlucly I'm not expert in isolation amplifiers, I'm more a software eng. than an electronic one

1) Can a design like the one attached works to you?
2) I take this opportunity to ask you if you see errors on the DIGITAL_OUTPUT and DIGITAL_INPUT stage. Thank you!
The actual board has a common ground and the machine works without problem, but I would like to build something a little better than the actual one.
Edit: I'm also looking at a simpler optocoupler solution, using linear optocoupler. Maybe something using the 4N25 opto?