I will re confirm tomorrow. But fairly certain the port ground wires terminated on the bob and Tried using those and the ground accociated with the 5v supply I started off using and had the same fault on each occasion

Ok. Put a new card in a pci slot today which has 2 parralel ports. The probe pin now works as it should looking at the diagnostics page.

However when I plug the mill in the estop circuit won't clear. I got the address of the new port via device manager and put in as port 2 on the ports and pins page, unticked port 1 and ticked port 2. I also changed all the port 1 settings to port 2 in the inputs page, still no joy.

What am I missing here?

Should work ok but if you attach your new xml I will have a look and see if I can find a problem.
Hood