Need 2nd opinion on Wiring diagram.. proximity - isolation - lpt.

[dazp1976]

Hello fellow members.
Just want to get a 2nd opinion on this wiring diagram below.
12 proximity sensors going into a 12 channel isolation board at 24v.
Then going out of the isolation board at 5v.
Then going from board directly into an input based LPT port of my cnc controller.


Sensors: NPN, NC, operating at 24v.
Isolator board designed for 24v/in & 5v/out.
LPT is port 5 of a UC300eth controller running at 5v.

Diagram:






Yes it would be easier to get a bi-directional bob for it but we're talking about the u.k. here.
You can't get Jack.
(Anyway. The multi isolator boards look neater and are easier to get)