1、 学校名称 外 文 翻 译 专 业： 班级学号： 学生姓名： 指导教师： 二一一年六月 学校名称 本科生毕业设计 原文 1： Programmable logic controllers 译文 1： 可编程逻辑控制器 原文 2： Foundation of PLC 译文 2： PLC 基础 专业班级： 学生姓名： 指导教师： 学 院： 2011 年 6 月 1 原文 1： Programmable logic controllers Programmable logic controller(PLC) is eight 10- Year on behalf new generation ind
2、ustry that develop the control equip, and is an automatic control, calculator with the thing that the correspondence technique combine together, and is a the spot equipments for exclusively used foring the industry production line controling. Make the PLC there is characteristics of obvious oneself
3、on the design with the long- term and continuous that circulate because of the special of the complexity, usage environment of the control object: The dependable is high, and the adaptability is wide, and have to correspond by letter the function, and weave the the convenience, construction mold pie
4、ce . Gather the the control in the modern in the system, the PLC have already become a kind of importance of basic control unit, control the realm the inside in the industry applied the foreground is very and extensive. A programmable logic controller(PLC) is a solid-state devide used to control mac
5、hine motion or process operation by means of a stored program. The PLC sends output control signals and receives input signals through input/output (I/O) devices.A PLC controls outputs in response to stimuli at the inputs according to the logic prescribed by the stored program.The inputs are made up
6、 of limit switches,pushbuttons,thumbwheels, switches,pulses,analog signals,ASCII serial data,and binary or BCD data from absolute position encoders.The outputs are voltage or current levers to drive end devices such as lolenids,motor staters,relays,lights,and so on.Other output devices such include
7、analog devices,digital BCD displays,ASCII compatible devices,servo variable-speed drives,and even computers. Programmable controllers were developed(circa in 1968) when General Motors Corp,and other automobile manufacturers were experimenting to see if there might be an alterantive to scrapping all their hardwired control panels of machine tools and other production equipment during a model changeover.This annual tradition was necessary because rewiring of the panels was more expensive than buying new oens.
