Y with A as slave axis won't work

[Neale]

And I've just had a look at the DMA860H manual! Yes, no fault output. One of the reasons I chose the EM806 was for this reason. So, looks like you will have to do without and just be a bit careful! Most of the time it's not an issue, just occasionally when you are a bit careless with a rapid feed along the bed and hit a clamp or something left lying about.Should it happen? Of course not! Does it happen? Well...

Looking on the bright side, if one end of the gantry has hit something and stalled the motor that side, chances are that if the machine is strong enough, the other side will also stall before permanent damage is done. And then you will be glad you worked out how to easily resquare the gantry without major engineering or measuring effort!

Good luck in any case.