The invention as depicted in a preferred embodiment is a retrofitted automated truss assembly jig setting system and one or more removable plank units used therewith. Removable plank unit includes a pair of drive motors each connected to a motor plate that is fixed to the bottom surface of a plank. A pair of rods extends along the length of the plank and each is operatively connected to a motor such that activation of a motor rotates a rod. Puck assemblies are carried by rods and are linearly transposed along rods when motors are activated. A computerized control system is operatively connected to provide for automated positioning of pucks. Planks on existing truss assembly tables may be removed and replaced with removable plank units to turn a traditional truss assembly jigging table into an automated truss assembly jigging table.