In the weld schedule, there must be an association to the weld gun. In robotic applications, the RAFT timer can be associated with up to four welding guns. To associate the schedule to the proper weld gun, the stepper function is used. The stepper in the RAFT control will not boost current but will count the number of welds being made.

On the image to the left, function 82 is assigned to stepper #1.