PHA vision technology uses a simple and efficient method. Only one drill hole in the steel profile of the bearing frame is required as a reference point, saving costs for installation, maintenance, etc. of traditional reference objects. For rough positioning, the target only needs to approach to the point where the reference hole falls within the sensor’s detection range of up to 120 × 150 mm. Once the PHA detects the hole, it calculates the deviations between the actual and target positions for the X and Y axes. Therefore users do not have to install a separate detection device for each coordinate direction.