The BOS 18KF-PA-1PE-S4-C is a type of smart sensor from Balluff, a German manufacturer of automation components that specialize in sensor technology. It is a multi-turn absolute encoder that features a highly accurate standard code, IP67 protection, and can be integrated with either 24 or 48 VDC power supply. The device is also equipped with CANopen, EtherNet/IP, PROFINET, and Modbus RTU protocols for communication between PLCs and sensors. It is a high-end industrial device that is suitable for a wide range of applications such as conveyor systems, CNC machines, machine tools, and robotics.