The full English name of PLC is Program mable Logic Controller, which was produced in the early 70s of the 20th century. The earliest PLC appeared as a replacement relay system, and its main function was only a logical and simple sequential control function.
Through the development of these decades, PLC is a kind of special planning for sequential control using the principle of accounting machine, and it is also versatile and easy to use. The PLC selects proprietary hardware planning, which can provide safe and reliable control and relatively perfect solutions for diversified automation equipment. In general, the function of PLC is relatively simple, with strong stability and low cost.
Now the skill development of PLC has become modular, modular planning of processors, and large-capacity memory can be patched to meet the requirements of real-time control. The diversity of I/O interfaces can be used for scanning, control and long-distance data exchange, and also support integrated control, communication, parallel computing, interruption and stability maintenance.
Of course, many PLC companies have information co-processor modules, high-end language co-processors, network adaptation modules, and I/O mode speeds with special functions, etc., to provide reliable and professional services for a variety of applications and different scenarios.
In the field of industrial automation, PLC and industrial computer are two types of equipment controlled by machinery, and they are also the basic equipment of most automation systems. For a long time, PLC has always been active in the main battlefield of industrial automatic control. Carefully observe the exhibition, the number of PLC and industrial computer manufacturers can be imagined.
The full English name of industrial computer is Induatrial Computer, and PCI bus and PC/104 bus are selected according to the characteristics of the accounting machine. In terms of processing function, the industrial computer can have a strong CPU, integrate rich I/O interfaces, have advantages in computing, storage, networking and software openness, and also have the function of docking I/O points with the function of expansion board to realize the control function of PLC. In general, the operation and maintenance accounting of industrial computer functions can be stronger than PLC.
In addition, because of the development of industrial computer skills, from the fan heat dissipation in the past to the current low-power fanless passive heat dissipation. More and more companies are also choosing modular planning, integrating many advantages of PLC, and announcing a variety of I/O interchange boards to dock LSI equipment. At present, the development of industrial computers has changed from one-machine one-screen planning to HMI functions with human-computer interaction.
In terms of application, there is not much difference between the use of PLC and industrial computer, which is generally used in mining, metallurgy, cement, electric power, chemical industry, petroleum, machinery manufacturing, car, textile, papermaking, environmental protection and loading and unloading occupations. It is mainly used in: sequence control, motion control, data processing, etc.
There are significant differences between PLC and IPC in terms of skill characteristics, but they are also constantly absorbing each other's strengths to get used to different application sites.
PLC strengths
1. PLC is small in size, low in power consumption, strong in anti-interference, and suitable for harsh environments;
2. The PLC uses a simple machine, which has high reliability, and its average time distance between failures (MTBF) can reach 500,000 or even 1 million hours;
3. PLC has a simple and intuitive programming form (such as ladder diagram);
4. The PLC has an internal real-time clock.
5. Low cost of protection.
The strength of the industrial computer
1. The industrial computer has the ability to calculate large;
2. Open standard system platform and PCI interface;
3. It can be connected to multi-screen display skills;
4. Abundant networking skills;
5. The trouble-free time of the industrial computer is about 50,000 hours (the trouble-free time is different for different manufacturers or operating environments).
6. Can be used as a data collection and has strong accounting skills.
In general, PLC and industrial computer are used in industrial automation equipment occupation, in addition to industrial control, industrial computer also has data collection, analysis, real-time upload of data to the cloud server and other functions. PLC and industrial computer, as the foundation of industrial equipment control, have been continuously transformed over the years, and the position of industrial equipment has been increasingly strengthened. The cooperation between the two of them, the application, basically satisfies the vast majority of industrial equipment.
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