The reason why there is only one magnetic switch on the finger cylinder to detect the position is based on the needs of control logic or system design. In some applications, it may only be necessary to detect the position of the piston at a specific position, so only one magnetic switch needs to be installed. This design can simplify the system structure and reduce costs while meeting functional requirements. For example, if the cylinder needs to stop or perform other actions when it reaches the end of the stroke, it may only need to install a magnetic switch at the end to trigger these actions. In addition, according to the specific application scenarios and control requirements, the number and position of the magnetic switches can be flexibly adjusted to achieve the best control effect and cost-effectiveness.