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Maybe someone could explain to me what cause the issue that even if i have THC ON in G code, when pierce delay is 0,1 sec UCCNC giving out motion before plasma Arc is On. Shouldn't UCCNC wait for ARCON and only after this signal release motion? I have Arc on when Hypertherm is on with i bit of delay, but i guess UCCNC should wait no? Today I couldn't cut circles on my part because motion started before Plasma was on, and resulted a three-qourter circle not a full.

Any Idea?

Yes, UCCNC waits with the motion for the Arc on signal to be active, if the THC and M3 is active.
If the THC or M3 is inactive then it will not wait.