1. Pen : An actual pen that draws on the plotted paper.
2. Write-move mechanism : used to lift and lower the pen.
3. Pen cartridge - holds several different colored pens. A plotter capable of multicolor output usually has a program in read-only memory (ROM) that instructs the plotter to pick up a new pen when the programmers require a color change.
4. x Driver motor - moves the pen horizontally across the paper.
5. y Driver motor - rotates the drum forward & backward.