What does the anchor point of photovoltaic module frame mean?

The positioning point of the photovoltaic module frame is the inner side of the long frame or short frame anchored by the machine at the designated position. According to the relevant information inquired, the frame of photovoltaic module includes a pair of long frames and a pair of short frames, which are characterized in that the long frames and the short frames are connected end to end through corner codes to form a rectangular frame for fixing solar panels. Both the long frame and the short frame are provided with cavities for inserting corner codes.