【正文】 ts peak period, the plete machine reliability improved hardware, system software has continually improved, greatly enriched applications, indepth industrial automation and control industries in various fields. According to inplete statistics, in the industrial automation industrial PC usage in the total industrial control puter 65%, and an annual growth rate of 21 per cent continued to expand. PC manufacturing industry by buying rate of the PC market as a whole accounted for about 10 percent. In the industrial automation process control systems used in industrial management industry accounted for %, applied to the console operator of %, applied to the management of the quality of %, applied to monitor and control, engineers console, Data Acquisition System respectively of the total %, % and %. Industrial PC A notable feature is independent of configuration, but also with the DCS, PLC, CNC and other puter connected work. At present, almost all DCS, PLC manufacturers use industrial PC control system preparation procedures, more and more panies use industrial control system operator interface PC as a workstation. Formed by the industrial PC puter control system in the field of industrial — 5 — automation process control play a very important role, has been outstanding for factory and workshop level process control, data acquisition, batch processing, quality control, automation and machine optimization and experts control, and other tasks. 2. Main features of the PC industry (1) an industrystandard application In order to enable different puter manufacturers can be linked to one another, as well as take full advantage of the market varied PC ponents and the functions provided by the module, industrial PC with standard interface, which not only required by the IEEE, DIN and ISO standards, to adopt AT (ISA), EISA and STD, VME, Multibus Ⅱ , and other bus standards. Industrial PC now has been widely adopted PCI, PCMCIA bus standard, the two industrystandard bus for improved performance and speed of a PC great role. (2) to take the necessary protection measures Applications must be based on the control of environmental conditions on the PC industry adopt various protective measures, adapted from a project management departments to the scene operational control applications. Industrial PC must be able tolerance of the harsh conditions at the production environment, we must have good heat dissipation, ventilation, waterproof, dustproof, antijamming and anticorrosion and antishock, antivibration and a series of protective features. (3) industrial operating system MSDOS because of lack of memory, unable to support multitask, the lack of realtime features working capacity and poor, has been basically not used. Along with the main puter chip, the rapid development of higher speed and better performance of industrial PC endless. In addition, almost all software development panies have shifted the focus will be open to the OS / 2, Windows and Unix, and other operating systems. Especially suitable for industrial process control automation realtime multitasking operating system application of Windows NT/2020 PC industry has generally bee the mainstream operating system. (4) and automation equipment and munications systems Industrial PC should be able to with a variety of automated equipment and systems for effective munication, such as PLC, DCS, data acquisition systems, as well as on — 6 — a management puter munication. With the continuous development of new technologies, due to open systems and system integration technology for the development needs of the PC industry these munications will be increasingly important role in the show. Standard munications work to the development of the industrial PC applications more open, and will enable its small puter pose a greater threat. MAP agreement to Etherbased munication works to allow various puter systems municate with each other directly. Different levels of automation in the mutual munication work systems, require separate handling of the munication channel. Industrial PC required monitoring level from the lower level data acquisition system and transmitted to a puter on. (5) the safe operation of In addition to the PC industry adopt various protective measures, the need for the operation of state industrial PC monitor, monitor the operation of puter systems and software, scheduled inspection procedures specified in the implementation of the cycle. Computer should be able to monitor the power supply, and failure or excessive deviation warning signal was issued. 2. Industrial PC the status quo and development trend Industrial PC now have a wide range of performance and functionality, lowgrade industrial PC with a CRT terminal operators, highgrade industrial workstation with a PC. Thus, highgrade and lowgrade industrial PC workstation performance and the price of overlap, the difference is disappearing, industrial PC and workstations increasingly blurred the boundaries between. Industrial PC workstation is the industrial automation process control system applications excellent choice, standard munication works and the use of graphical operating system makes industrial PC and other equipment to effectively municate. With 32bit and 64bit puter chips and the emergence of use, will be further enhanced industrial PC workstation functionality and performance, but also to a higher future direction. Industrial PC software is in the process of industrial automation control system of a key application. Hardware performance and the improvement of the drop in prices, as well — 7 — as standardization and greater efficiency, better graphics and the use of the operating system to promote industrial PC software is an important factor in development. At present,