PLC is the abbreviation of Programmable Logic Controller. It is a digital arithmetic controller with microprocessor for automatic control. It can load control instructions into memory at any time for storage and execution. PLC is a computer dedicated to industrial control. Its hardware structure is basically the same as that of microcomputer, including power supply, central processing unit, memory, input and output unit.

singlechip

Microcontroller is a kind of integrated circuit chip. It uses VLSI technology to integrate CPU, RAM, ROM, multiple I/O ports and interrupt system with data processing capability Timer/counter and other functions (may also include display drive circuit, pulse width modulation circuit, analog multiplexer, A/D converter and other circuits) are integrated on a silicon chip to form a small and complete microcomputer system, which is widely used in various fields.

Difference between PLC and SCM

PLC is a relatively mature control system composed of single chip computers, and is the product of a mature and stable single chip computer application system that has been debugged, with strong versatility.

Single-chip computers can form a variety of application systems, with a wider range of applications. However, as far as “single chip computers” are concerned, they are only an integrated circuit, and must be combined with other components and software to form a system for application.

From the use of the project, for single project or projects with few repetitions, PLC is fast and convenient, with high success rate and good reliability, but high cost. For a large number of supporting projects, the use of single-chip microcomputer system has the advantages of low cost and high efficiency, but it requires considerable research and development strength and industry experience to make the system stable. In essence, PLC is actually a set of single-chip microcomputer (with a wide range of single-chip microcomputers) system that has been completed.