Access control system for a sliding door with an object monitoring function

A system for controlling access to a restricted area in a building, wherein the system comprises a sliding door system and a controller for the sliding door system,

• wherein the sliding door system comprises a door frame and a sliding door which can be displaced in the door frame between a substantially closed position and an open position by a drive unit actuated by the controller, wherein the door frame has a passage region and a wall shell region which at least partially accommodates the sliding door in the open position, and wherein the sliding door has an end face which faces toward the passage region in the open position;
• the sliding door system additionally having a recognition device which is communicatively connected to the controller, wherein the recognition device is operable to capture and check credentials presented by an object attempting to gain access to the restricted area;
• wherein the controller has a processor unit and a sensor unit, wherein the sensor unit is arranged on the end face of the sliding door and wherein the processor unit is arranged in an inner space of the sliding door and is electrically connected to the sensor unit and the drive unit, wherein the processor unit is operable to access a stored record in a storage device if the credentials are valid, the stored record including an opening width (W) of the sliding door specific for the object and a height range for the object, and wherein the controller is operable to generate an alarm signal if a detected height (H) of the object in the passage region, as determined by the sensor unit, deviates from the height range contained in the stored record for said object.