【正文】 — 1 — 本科生畢業(yè)設(shè)計(jì) (論文 ) 外 文 翻 譯 原 文 標(biāo) 題 The characteristics and trends of PLC DCS and industrial PC 譯 文 標(biāo) 題 PLC、工業(yè) PC 與 DCS 的特點(diǎn)與趨勢(shì) 作者所在系 別 機(jī)械工程系 作者所在專業(yè) 機(jī)械設(shè)計(jì)制造及其自動(dòng)化 作者所在班級(jí) 作 者 姓 名 作 者 學(xué) 號(hào) 指導(dǎo)教師姓名 指導(dǎo)教師職稱 副教授 完 成 時(shí) 間 2020 年 12 月 07 — 2 — 譯文標(biāo)題 PLC、工業(yè) PC 與 DCS 的特點(diǎn)與趨勢(shì) 原文標(biāo)題 The characteristics and trends of PLC, DCS and industrial PC 作 者 Charles 譯 名 查爾斯 國(guó) 籍 美國(guó) 原文出處 Nuts and Volts 2907 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 standards 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 puter technology, munications technology and the rapid development of automatic control technology, the PLC will be the traditional relay control technology and the emerging puter technology and munications technology integration, with high reliability, strong function and flexible, Programming simple, easy to use and a series of advantages, 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 world39。s first programmable controller. Early separation from the programmable controller ponents and small and mediumsized integrated circuit ponent, the main function previously performed by the relay is pleted sequence control, such as timing. The early 1970s, small size, strong function and cheaper microprocessors used PLC, makes the PLC function has 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, in addition — 3 — to maintaining the original logic functions, has also increased the arithmetic operations, data processing and transmission, munications and selfdiagnostic capabilities. In the 198039。s, the late, as ultralargescale integrated circuit technology is developing rapidly, microprocessor 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. Characteristics 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 technology and the development of puter technology, the PLC functions are greatly enhanced, with the following characteristics: (1) high reliability. PLC benefited from the highreliability hardware and software on a series of antijamming measures and the cycle of its special scanning methods of work. (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 manmachine dialogue interface modules to the industrial position of local area works, it also multiple munications work 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 ponents, including the CPU, power supply, I / O, etc. is modular in design from the rack and cables will connect each module, the system39。s 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 puter 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 — 4 — modules are run and fault indication devices, userfriendly understanding of the operation and find fault. The modular structure, so any failure of a module, users can replace the module, allowing the system to rapidly resume operation. Second, the characteristics and Application of industrial PC 1. Industrial PC industrial control applications Industrial PC hardware and software support of a broad, diverse varieties can take full advantage of excellent graphical user interface capabilities, the industrial users an enormously attractive. Early PC but not suitable for industrial process control automation applications, such as increasing modified by strengthening the protection of the case, such as cooling damping taken measures to meet the industrial environment is the application of some of the requirements of the characteristics of its early development. In recent years, with the further integration of chips increase, the increase in functionality, system board technology, packaging ponents and surface mount technology improvements, and standard industrial bus, a standard operating system and graphical user interface software development, the Industrial PC development and application to enter i