The system of given Figure has the following functions: move a work piece into position, clamp it, start the drill, move it down to drill a hole in the work piece (as long as a thermal overload does not occur), back the drill out, turn the drill off, and then repeat for a new work piece.
Assume master NO start and NC stop buttons and that limit switches have both NO and NC contacts. The system stops if a thermal overload occurs and turns on a red light (not shown). Develop the physical ladder diagram.
