1、 1 本科生毕业设计 (论文 ) 外 文 翻 译 原 文 标 题 The characteristics and trends of PLC DCS and industrial PC 译 文 标 题 PLC、工业 PC 与 DCS 的特点与趋势 作者所在系 别 机械工程系 作者所在专业 机械设计制造及其自动化 作者所在班级 作 者 姓 名 作 者 学 号 指导教师姓名 指导教师职称 副教授 完 成 时 间 2010 年 12 月 07 2 译文标题 PLC、工业 PC 与 DCS 的特点与趋势 原文标题 The characteristics and trends of PLC, DCS a
2、nd industrial PC 作 者 Charles 译 名 查尔斯 国 籍 美国 原文出处 Nuts and Volts 29-07 Agust.2008 The characteristics and trends of PLC, DCS and industrial PC ABSTRACT: At present, widely used in industrial automation systems of the three large industrial PC, DCS and PLC. Here, for their economic and technological s
3、tandards and development trends described. KEYWORDS: PLC PC DCS automation trends First, the characteristics and Application of PLC 1. PLC Application Early PLC (Programmable Logic Controller, PLC), mainly to replace relay logic control to achieve. With computer technology, communications technology
4、 and the rapid development of automatic control technology, the PLC will be the traditional relay control technology and the emerging computer technology and communications technology integration, with high reliability, strong function and flexible, Programming simple, easy to use and a series of ad
5、vantages, as well as good performance of the industrial environment and control targets of performance in industrial production in a wide range of applications. 1969, the United States Digital Equipment Corporation (DEC) developed the worlds first programmable controller. Early separation from the p
6、rogrammable controller components and small and medium-sized integrated circuit component, the main function previously performed by the relay is completed sequence control, such as timing. The early 1970s, small size, strong function and cheaper microprocessors used PLC, makes the PLC function has
7、been enhanced significantly. In terms of hardware, in addition to maintaining its original switch modules, has also increased the simulation module, remote I / O modules and special function modules all. In terms of software, easy to use PLC Electric staff in the ladder diagram programming language,
8、 in addition 3 to maintaining the original logic functions, has also increased the arithmetic operations, data processing and transmission, communications and self-diagnostic capabilities. In the 1980s, the late, as ultra-large-scale integrated circuit technology is developing rapidly, microprocesso
9、r market a sharp price drop, the PLC makes the microprocessors used by the general improvement in grades. Furthermore, in order to further improve the processing speed of PLC, the manufacturer has developed a dedicated logic chip, greatly improving the PLC hardware and software functions. 2. Charact
10、eristics PLC In the developed industrial countries, PLC has been widely used in all industrial sectors. According to The United States market information World PLC and software market report, in 1995 the global software PLC and its economies of scale of about 5 billion US dollars 5. As electronic te
11、chnology and the development of computer technology, the PLC functions are greatly enhanced, with the following characteristics: (1) high reliability. PLC benefited from the high-reliability hardware and software on a series of anti-jamming measures and the cycle of its special scanning methods of w
12、ork. (2) with rich I / O interface module. PLC for different industrial field signal and the corresponding I / O modules and industrial devices or equipment at the scene of a direct connection. In addition to improving performance, it also has a variety of man-machine dialogue interface modules to t
13、he industrial composition of local area networks, it also multiple communications network interface module. (3) modular structure. To meet the needs of various industrial control, in addition to a small PLC unit, the vast majority of PLC are modular structure. PLC various components, including the C
14、PU, power supply, I / O, etc. is modular in design from the rack and cables will connect each module, the systems size and function in accordance with the needs of users of its own portfolio. (4) easy to learn programming. Most of the PLC programming relay control circuit similar to the ladder diagram form, the user, do not have computer expertise, it is easy to general engineering and technical personnel understand and master. (5) Installation is simple and easy maintenance. PLC does not require specialized equipment room in a variety of industrial environments can be directly run. Various
