New Project with Mesa 7I96 and THCAD-05

It is kinda convoluted, the plasmac.ohmic-probe pin is a generic probe pinput, it can be used by relay (which is what I use) or by ohmic or ohmic3. This pin is fed from a debounce component, the input of which is db_ohmic.in using a signal named plasmc:ohmic-probe.

I thought you were using ohmic3 but you are loading ohmic in custom.hal
linuxcnc.org/docs/devel/html/man/man9/ohmic.9.html

You seem to be missing these two lines from custom.hal:  

Here  is what you asked for Rod
 
 
 

Thats great.
If you do the changes to custom.hal that Phill suggests, you should be good.
if you get an error something like  "pin is already linked' you might need to add this as right before those 2 lines.

Ok copied the 2 lines to the custom Hal below the other lines talking about the Ohmic sense. Would not start QTPlasmaC did not like the last of the 2 lines removed and started QTPlasmaC fine not change in the operation.
I have attached the error message and the log file. 
 
 
 

will do in the morning I did get the error message

You need to do the unlink line that Rod posted.