I. Microcontroller
The development of microcontrollers in electronic technology mainly includes CPU development, program development, memory development, computer development, and C language program development. Simultaneously, ensuring the microcontroller can operate normally and orderly in highly complex computer and control environments requires specific measures from relevant personnel. The following is a brief introduction:
(1) CPU development. Developing the CPU bus width in a microcontroller can effectively improve the problem of slow information processing in a microcontroller, improve information processing efficiency and speed, and develop and improve the actual structure of the central processing unit, so that 2-3 CPUs can run simultaneously, thereby greatly improving the overall performance of the microcontroller.
(2) Program development. The rational application of embedded systems has been vigorously promoted. When developing programs, it is required that they can automatically execute various instructions, so as to quickly and accurately collect external data and improve the application efficiency of microcontrollers.
(3) Memory development. The development of microcontrollers should focus on memory, and strengthen the exploration of new memory based on traditional memory read and write functions, so that it can realize both static read and write and dynamic read and write, thereby significantly improving storage performance.
(4) Computer development. Further optimize and develop single-chip stress analysis, and apply computer systems to achieve data transmission through connection and communication data.
(5) C language program development. Optimized C language development can ensure that the microcontroller can operate normally and orderly in a very complex computer and control environment, thus promoting its widespread and comprehensive application.
II. PLC
PLC, also known as Programmable Logic Controller, is a digital computing system with a microprocessor. It is specifically designed for automated control in industrial environments and mainly controls and drives equipment through analog and digital inputs and outputs. It is used in industrial control fields such as machinery production, petroleum, and chemical industries.
In industry, programmable logic controllers (PLCs) are comparable to or nearly equivalent to the mainframe of a compact computer. Their advantages in scalability and reliability have led to their widespread application in various industrial control fields. Whether in computer-directed control systems, centralized distributed control systems (DCS), or fieldbus control systems (FCS), PLCs are used extensively. Many manufacturers produce PLCs, such as Siemens, Schneider Electric, Mitsubishi, and Delta; almost every company involved in industrial automation offers PLC products.
III. Differences between PLCs and Microcontrollers
The specific differences between a microcontroller and a PLC include:
1. First of all, PLC is a product developed based on microcontroller. The microcontroller is included in the PLC. The microcontroller plus the peripheral circuits form the PLC.
2. Microcontrollers are inexpensive but have a long development cycle; PLCs are expensive but have a shorter development cycle.
3. A microcontroller is just an integrated circuit chip that cannot be used alone. It must be combined with components and software programs to be used.
4. Microcontrollers have poor functional stability, inferior quality, and are relatively troublesome to use; PLCs are simple to use, highly reliable, convenient, quick, and have stable quality.
5. The underlying operation of a PLC is actually the operation of a microcontroller. A microcontroller can perform all the functions of a PLC, and its response speed and accuracy are higher than those of a PLC.
6. Microcontrollers can be used to construct various application systems of different sizes, and have a wide range of applications; while PLCs are just one of the more mature control systems in application systems composed of microcontrollers.
7. Microcontrollers are generally used in large-scale projects because they are efficient and low-cost; smaller-scale projects with high process requirements use PLCs more often.
8. Microcontrollers have higher requirements for the operating environment; PLCs can be used in harsher environments.
9. Microcontrollers typically use C and assembly languages for programming, which are quite difficult; while PLCs generally use ladder diagram languages, which are simple and easy to understand.
