References:

1968 American GM (general motors) company proposed to replace the electronic control device. In the second year, Digital Company of America developed a control device based on integrated circuit and electronic technology, which was applied to electrical control by programming for the first time. This is the first generation of programmable controller, called programmable controller (PC).

After the development of personal computer (PC for short), in order to facilitate and reflect the functional characteristics of programmable controller, programmable controller was named programmable.