In the wave of industrial automation surging today, industrial control equipment as the core force of modern manufacturing, is experiencing a profound intelligent change. The printed circuit board assembly (PCBA) is like the ‘intelligent brain’ and ‘power heart’ of industrial control equipment, deeply embedded in it, driving industrial control equipment in a comprehensive manner in complex industrial environments to run accurately, efficiently, and stably interconnected, drawing a strong picture of the grand blueprint of Industry 4.0. For the grand blueprint of Industry 4.0, it draws a colourful picture.