i had to buy a click plc to install on a project. since i had it on hand, i tried it with mach. it doesn't seem to be compatible with the modbus plug-in. maybe it is just a configuration problem. if anyone have success with this small plc, let me know. i would like to use it to control my i/o other then step and dir signal has a plc is much more reliable then any break out board.

Pretty impressive PLC especially for the price.  It looks like it should work with Mach, lot of ways to configure it.

Arnie