A new part in the gripperParts already placed: clamped, never movedA block frame; a new frame appears for a new columnThe same bench with the sheet already placed and clamped. Two parts arrive later: a pull-down resistor goes next to the controller on its own pin's row, stepping past the parts that already sit there, and a second sensor gets a new frame in the right-hand column level with the pins it talks to. Every part that was already on the sheet stays exactly where it was.