plc控制系统[外文翻译].doc

PLC控制系统[外文翻译]

包括英文原文和中文翻译，可作为plc相关毕业论文，毕业设计的外文翻译使用

英文：13100字符
中文：3965字

What is a PLC control system?
Since the 1960s the United States to launch programmable logic controller (Programmable Logic Controller, PLC) to replace conventional control devices since the relay, PLC has been rapid development in various parts of the world have been widely used. At the same time, PLC's function also improved. With computer technology, signal processing technology, control technology network technology development and user demand for continuous improvement, PLC in dealing with the volume switch on the basis of the increase in the amount of analog processing and motion control functions. Today, the PLC is no longer confined to the logic control, motion control, process control and other fields has also played a very important role.
     Discrete control of the system as the preferred product, PLC in the twentieth century to the 1990s and 1980s, have achieved rapid development in the world of PLC to maintain an annual growth rate of 20% to 30%. With the factory automation and continuous improvement in the PLC and market base expansion in recent years in the PLC industry slowdown in the growth rate of developed countries. However, China and other developing countries in the PLC's growing very rapidly. Comprehensive information, in 2004 global sales of the PLC for about 10,000,000,000 U.S. dollars, in the field of automation plays a very important position.
PLC touch by the imitation of the original relay control principle developed in the 1970s, only the PLC logic control switch, first of all applications in the automotive manufacturing industry. To the implementation of its store operations logic, the order of control, timing, counting and computing, and other operating instructions; and digital input and output operation to control all types of machinery and production process. The preparation of the user control procedures to express the production process requirements and advance into the PLC user program memory. Run-time by storing the contents one by one the implementation of procedures to complete the process required to operate. PLC's CPU instructions with step-by-step process to store the address of the program counter, running in the process, each step in the implementation of the automatic counter plus 1, step-by-step process from the start (zero-step number), followed by the final step to the implementation of the (usually END command), and then return to start step-by-step cycle of operation. Each PLC completed a cycle of the time required for the operation known as a scanning cycle. Different models of the PLC, scanning cycle to cycle in a microsecond between the scores of microseconds. PLC ladder program used in calculating logic, to show the advantages of quick, microsecond in the ......

什么是PLC控制系统？
自60年代以来，美国推出PLC（可编程逻辑控制器，简称可编程控制器），以取代传统的控制设备，一直在快速发展中世界各地区都得到广泛应用。同时，PLC的功能也有所改善。随着计算机技术，信号处理技术，控制技术，网络技术的发展和用户需求的不断提高， PLC在处理开关量的基础上增加了模拟量处理和运动控制功能。今天，该公司已不再局限于逻辑控制，运动控制，过程控制及其他领域也发挥了非常重要的作用。
离散控制系统的首选产品，PLC在二十世纪90年代和80年代，取得了长足的发展在世界上的PLC保持年均增长20％至30％ 。随着工厂自动化和持续改进的PLC和市场基础扩大最近几年在PLC的工业增速下降趋势，发达国家。然而，中国和其他发展中国家的公司的发展十分迅速。全面的信息， 2004年全球销售的PLC约一百万点零零零万美元，在自动化领域发挥了非常重要的地位。
PLC的触摸的仿原继电器控制原理研制在上世纪70年代，只有PLC逻辑控制开关，首先应用在汽车制造业。在执行其存储业务的逻辑，顺序控制，定时，计数和计算，和其他业务的指示;和数字音频输入和输出操作，控制所有类型的机器和生产工艺。编写控制程序的用户表示，生产过程的要求和进入PLC的用户程序存储器。运行时存储的内容逐一执行程序，以完成该过程所需的操作。可编程控制器的CPU指示一步一步进程存储地址的程序计数器 ......