Looking in the direction of travel, the version shown above is located inside the left band profile.
The main image shows a pre-stopper for the right inside of the band profile.
The VS pre-stopper is used in connection with a workstation. It prevents workpiece carriers (WT) from entering a workstation that is already occupied. A sensor is able to determine when a workpiece carrier leaves the pre-stopper position. The stopper is also used in corner stations to separate workpiece carriers upstream of the transfer unit.