PLC and PC -based technical characteristics and advantages

PLC and PC -based technical characteristics and advantages compared newmaker welcome to e hall exhibition hall 3 PLC PLC programmable controller, PLC controller programming cable. 。 。 Long-term since, PLC is always active in the main battlefield of industrial automation control, for all kinds of automatic control equipment provides a reliable control applications. The main reason is that it can be for automation applications to provide a safe and reliable and more perfect solutions, suitable for the current industrial enterprise of automation application requirements. With the advent of the era of the PC and the Internet, industrial PC or PC -based controller can completely into the era of network information system, network system of the basic characteristics, namely the system with high performance and low price, the advantages of the open and abundant talent base, so the PC - -based controller once a strong vitality, development is very rapid. A view said, PC - -based controller will replace the traditional PLC controller, of course, you must first solve the problem of reliability and programming. In recent years, these problems have been solved, PC - -based controller from appearance to reliability can have similar to the PLC. In programming, because IEC61131 - Three of the programming language standard and widely adopted, for PC - With the rapid development of -based controller has paved the way. In this way, the PC - -based controller not only has the advantage of PC, also has the advantage of traditional PLC. It can be seamlessly integrated into the Internet age of information system. Technology in the field of automatic control, PLC and PC -based technology is the comparison of the current representative control technology, the origin and development of technology has a big difference. PLC( ProgrammableLogicController) In the early 1970 s. The earliest PLC is replacing relay system, the role of the main implementation of function is just a simple logic sequence control function. PLC, once appear, for its high reliability, small volume and intuitive programming model and shows strong vitality, become a 'star' in the field of automatic control. PC - -based is a kind of control system based on PC technology. PC - at the earliest -based control system based on industrial computer as the core, by extending the special card with PCI interface. PC - -based by means of the development of IT technology, in terms of computing, storage, network and software open. PLC and PC -based on technical characteristics of the obvious difference. PLC controller has small volume, low power consumption, strong anti-interference ability; Has the very high reliability, its average without failure rate interval ( MTBF） Up to 500000, even 1 million hours; With simple and intuitive programming model ( Such as ladder diagram) ; Has the internal real time clock. The PC - -based has a large capacity; With open standards system platform and PCI interface; Elegant and display technology of the low cost; Rich network capacity. But the system reliability of slightly, such as performance better IPC MTBF of about 50000 hours. In addition, the PC - -based, although have very strong CPU, its is real-time multitasking operating system, so the program cycle but not high performance PLC is fast. PLC is more suitable for the equipment control, and PC - -based more used for monitoring of running status of equipment. Relative to the PC - -based, PLC has flexible configuration, small volume, adapt to bad environment, strong anti-interference, high reliability, etc. But in such aspects as software functions and system openness - than PCS -based slightly worse. Of course, with the continuous development of computer technology and control technology, PLC and PC -based on absorbing the advantages of each other, so as to adapt to more application field. PLC application in packaging equipment, for example, far more than the PC - -based application in packaging equipment. As the PC - -based industrial computer ( Hereinafter referred to as industrial PC, compared with the ordinary computer, it has dust, vibration, electromagnetic resistance, high and low temperature resistance, etc) Development, the industrial PC, I/O and monitoring device, control network composed of PC - -based automation system gradually become another way of implementation of industrial automation. PC - -based automation system from the PC, can be fully integrated into the network era of information system, the system with high performance, low prices, open, rich talent and the advantages of the application base.
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