As the name implies, a single-chip computer is a computer system integrated in a chip, also known as a single-chip microcontroller, which has all the functions of a computer. PLC is a programmable logic controller, and PLC is an electronic system for digital operation, which is widely used in industrial control. So what is the difference between a microcontroller and a PLC?

1. PLC is a product built on a single chip, which is a programmable integrated chip.

2. PLC is more suitable for use in harsh industrial environments, and the working environment of single-chip microcomputers is higher;

3, the price is different. The development cost of single-chip microcomputer is low, and a single-chip microcomputer is a dozen to dozens of pieces, but it is troublesome to develop. The price of PLC is hundreds, thousands, tens of thousands, but the development cycle is short and the effect is quick. High reliability.

4. PLC has certain interchangeability, quality is guaranteed, and programming software is moving towards standardization. And the single chip application system is different in function, the quality is uneven, it is very difficult to learn, use and maintain.

5. The programming language of the single-chip microcomputer is C language or assembly language, and its own programming language (such as the ASM language of the 51 single-chip microcomputer) is also used. The programming languages ​​of PLC are: Ladder Diagram Language (LD), Instruction List Language (IL), Function Block Diagram Language (FBD), Sequential Function Flow Chart Language (SFC), Structured Text Language (ST).

6. PLC is a relatively mature control system composed of single-chip microcomputers. It is a product of a mature and stable single-chip microcomputer application system that has been debugged, and has strong versatility. The single-chip microcomputer can form a variety of application systems and has a wider range of use. As far as "single chip microcomputer" is concerned, it is only an integrated circuit, and it must be used with other components and software to form a system.

7. For large-scale 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 run stably and reliably. The best way is to embed the function of the PLC in the single-chip system, which can greatly simplify the development time of the single-chip system, ensure the performance, and ensure the benefits.

The above is the difference between single-chip microcomputer and PLC. Now the single chip can completely replace the PLC. Due to the weak stability and anti-electromagnetic interference ability of the previous single-chip microcomputer, there is no way to compare with PLC. Now the single-chip microcomputer has achieved high stability and strong anti-interference ability, and has been replaced in some fields.