I should have replied some time back, my bad.
Somewhere between unloading and reloading everything, updating to the most recent version of M4, re-mapping motors to more conventional mappings in M4, and family visitors leaving after the Holiday, all is now good. Have since worked out getting CLICK PLC, Modbus, and Mach4 to work together.
Will likely write my own homing routine that homes off of limit switches - taking the "rack" out of the gantry, then back off to index signals mounted on servo encoders.
Shamanj;
You mention Mach3, is that what you are using??