Hello, I have just installed a rotary axis A on my plasma. The THC board only works on the X and Y or X and A or Y and A axis.
It does not work with simply the A axis. Let me explain: if I want to cut an end of a pipe over its entire circumference, the THC card is inactive, because only the A axis is moving. If I make a hole on the pipe, the THC card works because the X axis is moving at the same pace as the A axis.

This sounds like a plugin issue.  You will probably have to reach out to whoever you are using for your motion controller. 
This is just an assumption as I do have a plasma, but I know that the THC stuff is typically controlled with the Motion Controller.

thank you indeed, that's what I did and the problem is solved with a new plugin