Four directions for the future development of the

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There are four directions for the future development of PLC

with the development of semiconductor technology, computer technology and communication technology, the industrial control field has undergone earth shaking changes, PLC is also developing continuously, and is moving towards new technology development, mainly including the following points:

first, the development of PLC networking technology, in which there are two trends: on the one hand, PLC networking system is no longer a self-contained closed system, Instead, it is rapidly developing to an open system. In addition to forming their own unique PLC network system and completing equipment control tasks, the major brands of PLC can also connect with the upper computer management system to realize information exchange and become a part of the entire information management system; On the other hand, fieldbus technology has been widely adopted. PLC and other intelligent equipment installed on the site, such as intelligent instruments, sensors, intelligent solenoid valves, intelligent drive actuators, are linked through a transmission medium (such as twisted pair, coaxial cable, optical cable) and transmit information to each other according to the same communication protocol, thus forming a field network. Compared with a simple PLC remote network, The configuration is more flexible, the expansion is more convenient, the cost is lower, the performance price ratio is better, and it is more open

second, PLC is developing towards high-performance miniaturization. The functions of PLC are becoming richer and richer, while the volume is becoming smaller and smaller. For example, Mitsubishi's fx-1s series PLC, the smallest model, has a volume of only 609075mm, which is equivalent to a relay, but it has the ability of high-speed counting, ramp, alternating output, 16 bit four principle operation and other functions, as well as the time setting function of adjustable potentiometer. PLC is no longer the product that can only perform switching logic operation in the early days, but has increasingly strong analog processing capacity and other advanced processing capabilities that were only available on the computer in the past, such as floating point number operation, PID regulation, temperature control, precise positioning, step-by-step drive, report system 283 steel structure fire retardant coating, etc. In this sense, the difference between PLC system and DCS (distributed control system) is becoming smaller and smaller, and PLC can also form a process control system

thirdly, PLC operation is developing towards simplification. At present, one of the difficulties of PLC promotion is that complex programming makes users flinch, and all programming languages of PLCs from different manufacturers are different. Users often need to master more programming languages, which is more difficult. The programming and application of PID control, network communication, high-speed counter, position control, data recording, formula and text display are also difficulties in PLC programming. When programming them with ordinary methods, it is necessary to be familiar with the meaning of the special memory injected into the room carefully, assign values to them during programming, and access them to realize the corresponding functions during operation. These programs are often related to interruption. The programming process is cumbersome and error prone, which hinders the further popularization and application of PLC. The development of PLC is bound to simplify the programming of complex tasks. At this point, Siemens has acted as a pioneer. Siemens s programming software has designed a large number of programming guides. It can automatically generate user programs including interrupt programs by inputting some parameters in the dialog box, which greatly facilitates the use of users

fourthly, embedded PLC has great development space. The development of embedded PLC is also diversified and has good performance at home and abroad: netplc, which combines fieldbus technology and PLC technology, launched by heyouxun, Germany, is very unique; Several years ago in China, Huazhong University of science and technology loaded the embedded PLC system software into easycore1.00 core chipset and developed the embedded PLC with multi-mode human channel as the hardware platform; Another development path is a platform that aims to develop the hardware/software integration of PLC and man-machine interface. It makes full use of case tools and combines the development platforms of various embedded chips and the hardware circuit libraries of various input/output channels to develop customized and ODM specific PLC for electromechanical equipment

the development space of embedded PLC in China, first of all, is that it is very flexible and is conducive to the development of China's automation industry: it has a strong market foundation for electromechanical equipment, and has sufficient design and development teams with the best cost performance in the world. We can not only provide you with high-quality experimental equipment with the lowest cost and higher quality, but also design and produce embedded PLC for electromechanical equipment according to the requirements of customization to replace the general PLC

at the same time, the functions of hardware, software, man-machine interface, communication and other aspects of embedded PLC are designed flexibly and easy to cut, which is closer to the requirements of various grades of electromechanical equipment. Embedded PLC is completely based on the technical foundation of embedded system, and it can be used as soon as it is used. The advantages of SOC chip, embedded operating system and programming environment conforming to IEC programming language standard make it easy to find in the market

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