致谢词

本论文是在易锋老师和同学的帮助下完成的。易老师渊博的知识、敏锐的洞察力、丰富的实践经验和富有创建的学术思想给本论文的研究指明了方向，而易老师严格的治学精神，兢兢业业的工作态度以及对于科学的孜孜不倦的追求，使我在科学的道路上受益非浅，更在人生观和世界观的培养上受到启迪。易老师对于科学的严格态度将永远激励我学习！在此，谨向我尊敬的易老师表示由衷的感谢和最真诚的敬意！同学的关心也是我的论文能够圆满完成的关键，在此，我也向我的同学表示感谢！

此外，我还要感谢南通职业大学提供良好的上机环境，使我的论文圆满完成，对我的同学、老师，还有学校表示在次的感谢！

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参考文献

[1]、可编程序控制器原理及其应用系统设计技术 宋德玉 北京 冶金工业出版社 1999、7

[2]、电气控制及PLC 周军 北京 机械工业出版社 2001、8 [3]、压铸机控制技术 彭继慎 北京 机械工业出版社 2006、6 [4]、液压气动技术手册 路甬祥 北京 机械工业出版社 2002

[5]、可编程序控制器（PLC）应用技术 徐德 济南 山东科学技术出版社 1996、1

[6]、液压传动与气压传动 何存兴、王明智 武汉 华中科技大学出版社 2000、8

[7]、可编程序控制器及其应用 万太福、唐贤永 重庆 重庆大学出版社 1995 [8]、微机可编程序控制器原理使用及应用实例 耿文学 北京 电子工业出版社 1990、11

[9]、可编程控制器原理与程序设计 谢克明、夏路易 北京电子工业出版社 2002、8

[10]、可编程序控制器 黄明琪、冯济缨、王福平 重庆大学出版社 2003、5

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[11]、液压与气压传动 路甬祥 北京 机械工业出版社 2005

[12]、PLC在金属压铸机控制系统中的应用[J] 陆秀玲 李可生 机电一体化 2003、6

[13]、基于可编程控制器的热室压铸机自动控制系统[J] 赵黎丽 轻工机械 2003、3

[14]、现代电气控制及PLC应用[M] 张桂香 北京 化工工业出版社 2003 [15]、现代电气控制及PLC应用技术[M] 王永华 北京 北京航空航天大学出版社 2000

外文翻译

PLC control system design main point

In the modernized industrial production equipment, has the massive digital quantity and the simulation quantity control device, for example the electrical machinery stops, solenoid valve's make and break, the product counting, the temperature, the pressure, the current capacity hypothesis and the control and so on, in the industry scene's these automatic control question, the programmable controller (PLC) has become one of solution most effective tools. When PLC control system design should pay attention to the following several spots. one, programmable controller (PLC) and programmer's selecting and purchasing: in the present market's PLC product is numerous, besides the domestically produced brand, the overseas brand includes: Japanese OMRON, MITSUBISHI, FUJI, IDEC, HITACHI, do Matushita, Germany's Simens, South Korea's LG and so on, how select and purchase the PLC product? 1. The system first

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should determine that the system uses PLC with the PLC single plane control to form the network, from this calculates the input, the output (I/O) the points, and when selects and purchases PLC must in the actual need points foundation reserve 10% remainders. 2. The definite load type acts according to the PLC out-port to have the load is the cocurrent or the exchange, is the big electric current or the undercurrent, as well as PLC output movement frequency and so on, thus determined that the out-port uses the relay to output the transistor to output, perhaps thyristor output. The different load selects the different output mode to system's steady operation is very important. 3. The storage capacity and the instruction carry out the speed are the PLC shaping important targets, generally the reserves is bigger, the speed quicker PLC price to be higher, although overseas various factories product more or less the same, but also has certain difference.

4. “COM \COM \spot. When the load type are many, and the electric current is big time, uses one \COM \one \software is different, the compatibility is also systematically selects and purchases when the key point, at present had not discovered that the completely compatible product, should select the PLC product reasonably according to the system. 6. Programmer's selecting and purchasing: the PLC programming may adopt three ways: First, with the general handhold programmer, it can only use in the sentence table sentence programming which the factory stipulated. Center way easy scene debugging, and the volume small cost is low, but its efficiency low adaptation aircraft type type are few, compared with is suitable is small in the system capacity, in amount used few systems. Second, the graph programmer programming, this way uses the graphic mode programming, facilitates intuitively, generally the electrical personnel short-term may apply freely, but the programmer price is high. Third, programs with IBM and the compatible personal computer +PLC software package, this way is the efficiency highest one way, is also the most commonly used one way, but the majority of software package price is expensive. 7. selects the big company's product as far as possible, because its product quality has the safeguard, and the technical support, the post-sale service is also generally good, will be advantageous in the later product expansion and the software and hardware promotion. Second, input, output circuit's design 1. power source return route The PLC power supply is

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