Embedded system is a special computer system, as a part of equipment or device. Usually, an embedded system is an embedded processor control board, and its control program is stored in ROM. In fact, all devices with digital interfaces, such as watches, microwave ovens, video recorders, cars, etc. , using embedded systems, some embedded systems also include operating systems, but most embedded systems realize the whole control logic by a single program.
Plc is a digital operation electronic system specially designed for industrial environment application. It uses programmable memory, which stores instructions for logical operation, sequence control, timing, counting and arithmetic operation, and controls various types of mechanical equipment or production processes through digital or analog input and output.