PLC, also known as programmable logic controller, is a digital operation electronic system specially designed for automatic control in industrial environment. Programmable controller consists of internal CPU, instruction and data memory, input and output unit, power supply module, digital analog and other units, and controls various types of mechanical equipment or production processes through digital or analog input and output. At present, the programmable logic controller used in industry is quite close to a lightweight computer, and even programmable automation controller, which integrates personal computer (using embedded operating system) and PLC, appears. As an electronic system, it can control mechanical equipment, manufacturing process and other control modules through digital or analog input/output modules. Programmable logic controllers are widely used in the current industrial control field. In the field of industrial control, the application of PLC control technology has become an indispensable member of industry.
Copywriting, originally refers to the table where books are placed, and later refers to the person who writes on the table. Now it refers to the writing position in a company or enterprise, that is, to express the established creative strategy in words. Copywriting is different from designers' expression through pictures or other means, and it is a process of performance, development and deepening in turn with advertising creativity, which mostly exists in advertising companies, corporate propaganda, news planning and so on. Copywriting consists of title, subtitle, advertising text and advertising slogan. It is a literal expression of advertising content. In advertising design, copywriting is as important as graphics, graphics have early influence, and advertising copywriting has a deep influence.