Fanuc RJ3iB with ESAB devicenet welder

Hi, i have recently integrated an ESAB welder to a Fanuc Arcmate 100iB as a R & D project. i have the devicenet communicating and set up. The problem i am having is i cannot weld using the Arc Start command in the program. i have the Weld Start output assigned to DO[1] and can force the output in a program and weld using the DO[1] = ON command. The arc start command will not tell the welder to weld. Fanuc has not been any help and i am a lincoln + Arclink guy. Anyone know of a different place i need to assign the weld start output at other than the I/O screen? Any help is appreciated. Thank you!