The Siemens 6FB1111-1AT20-1AT1 is a reliable control device designed specifically for elevator doors, distributed by BSP Automation. Known as the SIDOOR AT12, this horizontal control unit is engineered to handle elevator doors weighing up to 120 kg. It operates on a 230 VAC power supply and features communication via a single RS485 interface. Additionally, the device includes three digital inputs, two relay outputs, and one 24 VDC output, making it versatile for various elevator door control applications. It is built to function efficiently within a temperature range of 0 to 50 degrees Celsius, ensuring dependable performance in standard elevator environments.