机电工程专业英语 教学课件 ppt 作者 马佐贤 主编 张雪娟 副主编Unit 9.pptVIP

Assignment * * Unit 9 Introduction to PLC Introduction to PLC 9.2 Dialogue 9.1 Dialogue 9.1 Topic Introduction: Tom and Mary are visiting an line of computer integrated manufacturing. They want to get some information about CIM. CIM Computer Integrated Manufacturing = Key Questions: 1. What does the word “integrated” mean in the phrase CIM? In the phrase “computer-integrated manufacturing”, “integrated” may be used to mean “ all the manufacturing activities are made into a whole system.” That is, all the manufacturing activities, including raw material handling（材料搬运）, production planning（生产计划）, production of parts and components（元器件的生产）, assembly（装配） , quality-inspection（质量检测）, and so on, are controlled and integrated by a computer system. Key Questions: 2. Can you tell the difference of “inventory”, “inventor”, and “invention”? “ Inventory” means a detailed list of articles, or the amount of stock which are named in the inventory, the word “inventor” means a person who has invented something, and the word “invention”, the action that an inventor has taken, or the thing that the inventor has invented. Important words and phrases: inventor 发明人 invention 发明 inventory 详细目录，财产清单，存货，库存量 计算机辅助设计 computer assisted design 计算机辅助工程 computer assisted engineering 计算机辅助生产计划 computer assisted production planning Preview the text: Introduction to PLC Introduction to PLC 9.2 Teaching Aim: To understand the history, application and architecture of PLC. 2. To remember some important words and phrases. Hi~ everyone! Unit 9 Introduction to PLC 可编程逻辑控制器 Mechanical Control 机械控制 Pneumatic Control 气动控制 Electromechanical Control 机电控制 Electronic Control 电子控制 Computer Control 计算机控制 PLC 可编程控制 机械控制包含有凸轮和调速器，尽管 它们曾用于对非常复杂机器的控制，也比 较经济，但现在它们仅仅用于简单的固定 循环控制中。一些自动机床，如攻螺纹机 床，仍旧使用基于凸轮的控制。机械控制 的缺点是装置制造较困难而且容易磨损。 Mechanical Control 机械控制 气动控制对于某些应用仍很流行。它 利用压缩空气、阀门及开关构成简单的控 制逻辑，但它的速度相对较慢。由于采用 标准件构成控制逻辑，因此它比一个机械 控制装置更易于加工制造。气动控制元件 同样易于磨损。 Pneumatic Control 气动控制 正像机