Y with A as slave axis won't work

[Neale]

On modern digital drives (I use EM806) there is a stall-detection capability. Typically, if a motor is stalled at above about 300rpm, the drive stops and enables the fault output signal. You can use this to tell the motion controller that there is a fault so that it then stops driving the other motors. My drivers are configured with all the fault outputs in parallel so that if any one trips, the machine stops. This is useful on a dual-motor gantry machine. Joining the two ballscrews with a belt won't achieve this. On the IP/M I think you use the "servo fault" input.