I think I found what't wrong.

This seems to be related to ESS plugin, not MACH4 itself.

If anyone use stepper motors and set it in CW/CCW mode, his/her machine might malfunction.

In this case, s/he needs to change his stepper driver configuration to Step/Dir mode.

Then the machine would work properly.


I posted something about it on
https://warp9td.com/index.php/kunena/7-general-discussion/8271-ess-v253-m4-4322-m6-toolchange-macro-malfunction?limitstart=0