I am implementing Modbus control of a spindle. Once I check the Modbus InputOutput Support box on the Config - Ports and Pins screen I have a problem closing Mach. It appears to close, but when I try to start Mach again it will not open. I have to go into task manager and end the task for Mach.

Are you running any antivirus? If so, what happens when you disable it?

I disabled virus protection and nothing changed.

I think I would do a clean install of Mach3 and enable modbus in one of the default profiles to see if the issue still exist.

I think I would do a clean install of Mach3 and enable modbus in one of the default profiles to see if the issue still exist.

That was a very good idea. Unfortunately it did the same thing. I tried to make sure my machine was clean of anything previously installed so I uninstalled Mach, deleted the entire Mach3 directory, and deleted any registry entries that had Mach3 in the name. The clean install using a default profile did the same thing. I am running version 3.043.062.

I would appreciate it if someone else would try temporarily enabling Modbus on the Ports and Pins configuration screen. Then close Mach and try re-opening. Will you have to kill Mach in task Manager or re-boot to get it to start? The reason I am asking is because all of my machines have had my XML file on them and I want to make sure that something is not hanging around. If this happens on someone else's machine, I can be pretty certain it is a Mach problem and not something to do with  my configuration.

Thank you in advance,
Kent

Mach support solved the issue. I need to run the program as Administrator. Never had to do that before. Not a big deal for me, but for shops with multiple employees I can see how they may not want to give Admin privileges to everyone running the machine.

Kent