The development trend of PLC

To develop in the direction of high speed, large capacity, in order to improve the processing power of PLC, the requirement of PLC has better response speed and a greater storage capacity. At present, some PLC scanning speed can reach 0. Step 1 ms/k or so. PLC scanning speed has become an important performance index. In terms of storage capacity, some PLC up to a few megabytes. In order to enlarge the storage capacity, some companies have used magnetic bubble memory or hard disk. To develop in the direction of large, small two current small and medium-sized PLC controller is more, in order to meet the multiple needs of the market, to many varieties PLC direction in the future, especially to the large and small two direction. Now have a mega PLC I/O points to 14336 points, its use 32-bit microprocessor, multi-cpu parallel work and mass storage, function is strong. Small PLC from the whole structure to the development of small modular structure, make the configuration more flexible, in order to the market need to have developed a variety of simple and economic subminiature miniature PLC, minimum configuration of I/O points for 8 to 16 points, to meet the needs of the single and small automatic control, such as alpha series PLC of mitsubishi company. PLC to develop intelligent module, strengthen network communication capabilities to meet the requirements of all kinds of automation control system, continuously developed in recent years many function modules, such as high speed counting module, temperature control module, remote I/O module, communication and man-machine interface module, etc. These smart of CPU and memory I/O module, not only extended the function of PLC, and convenient use and expand the application range of PLC. Enhance the ability of PLC network communication and PLC is the tide of technological progress. PLC network communication has two kinds: one kind is networking communications between PLC, the PLC controller manufacturers have their own proprietary networking method; Another kind is the communication between PLC and computer network, the general PLC has special communication module and computer communication. In order to strengthen the network communication ability, PLC manufacturers are also consultations between general standard of communication, to form larger network system, PLC has become a collecting and distributing control system ( DCS） The indispensable important component. Strengthen external fault detection and handling ability according to the statistical data show that in the PLC control system fault, 5% CPU, I/O interface (15%), input devices (45%), and output devices (30%), line (5%). The preceding two paragraphs, a total of 20% failure belongs to the internal fault of PLC, it can be realized by software and hardware of PLC itself detection and processing; While the remaining 80% of the external fault fault belongs to the PLC. PLC manufacturers are committed to research and development, therefore, a special intelligent module for external fault detection, further improve the reliability of the system. Programming language diversity with the constant development of PLC system structure at the same time, PLC programming language is becoming more and more rich, function also enhances unceasingly. In addition to most of the use of PLC ladder diagram language, in order to adapt to all kinds of control requirements, the step programming language for sequential control, process control flow chart of the language and compatible with the computer high-level language ( BASIC, C language, etc. ) And so on. A variety of programming languages co-exist, complementary and development is a kind of PLC progress trend.
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