众文网1.求PLC相关英文文献 以及 中文翻译——毕业设计急用
你要的不知是不是这个。
希望帮得了你。 Central Processing Unit (CPU) is the brain of a PLC controller. CPU itself is usually one of the microcontrollers. Aforetime these were 8-bit microcontrollers such as 8051, and now these are 16-and 32-bit microcontrollers. Unspoken rule is that you'll find mostly Hitachi and Fujicu microcontrollers in PLC controllers by Japanese makers, Siemens in European controllers, and Motorola microcontrollers in American ones. CPU also takes care of communication, interconnectedness among other parts of PLC controllers, program execution, memory operation, overseeing input and setting up of an output. PLC controllers have complex routines for memory checkup in order to ensure that PLC memory was not damaged (memory checkup is done for safety reasons).Generally speaking, CPU unit makes a great number of check-ups of the PLC controller itself so eventual errors would be discovered early. You can simply look at any PLC controller and see that there are several indicators in the form. of light diodes for error signalization. System memory (today mostly implemented in FLASH technology) is used by a PLC for a process control system. Aside form. this operating system it also contains a user program translated forma ladder diagram to a binary form. FLASH memory contents can be changed only in case where user program is being changed. PLC controllers were used earlier instead of PLASH memory and have had EPROM memory instead of FLASH memory which had to be erased with UV lamp and programmed on programmers. With the use of FLASH technology this process was greatly shortened. Reprogramming a program memory is done through a serial cable in a program for application development. User memory is divided into blocks having special functions. Some parts of a memory are used for storing input and output status. The real status of an input is stored either as “1”or as “0”in a specific memory bit/ each input or output has one corresponding bit in memory. Other parts of memory are used to store variable contents for variables used in used program. For example, time value, or counter value would be stored in this part of the memory. PLC controller can be reprogrammed through a computer (usual way), but also through manual programmers (consoles). This practically means that each PLC controller can programmed through a computer if you have the software needed for programming. Today's transmission computers are ideal for reprogramming a PLC controller in factory itself. This is of great importance to industry. Once the system is corrected, it is also important to read the right program into a PLC again. It is also good to check from time to time whether program in a PLC has not changed. This helps to avoid hazardous situations in factory rooms (some automakers have established communication networks which regularly check programs in PLC controllers to ensure execution only of good programs). Almost every program for programming a PLC controller possesses various useful options such as: forced switching on and off of the system input/outputs (I/O lines), program follow up in real time as well as documenting a diagram. This documenting is necessary to understand and define failures and malfunctions. Programmer can add remarks, names of input or output devices, and comments that can be useful when finding errors, or with system maintenance. Adding comments and remarks enables any technician (and not just a person who developed the system) to understand a ladder diagram right away. Comments and remarks can even quote precisely part numbers if replacements would be needed. This would speed up a repair of any problems that come up due to bad parts. The old way was such that a person who developed a system had protection on the program, so nobody aside from this person could understand how it was done. Correctly documented ladder diagram allows any technician to understand thoroughly how system functions. Electrical supply is used in bringing electrical energy to central processing unit. Most PLC controllers work either at 24 VDC or 220 VAC. On some PLC controllers you'll find electrical supply as a separate module. Those are usually bigger PLC controllers, while small and medium series already contain the supply module. User has to determine how much current to take from I/O module to ensure that electrical supply provides appropriate amount of current. Different types of modules use different amounts of electrical current. This electrical 。
2.求PLC相关英文文献带中文翻译~急需~可加分200
Central Processing Unit (CPU) is the brain of a PLC controller. CPU itself is usually one of the microcontrollers. Aforetime these were 8-bit microcontrollers such as 8051, and now these are 16-and 32-bit microcontrollers. Unspoken rule is that you'll find mostly Hitachi and Fujicu microcontrollers in PLC controllers by Japanese makers, Siemens in European controllers, and Motorola microcontrollers in American ones. CPU also takes care of communication, interconnectedness among other parts of PLC controllers, program execution, memory operation, overseeing input and setting up of an output. PLC controllers have complex routines for memory checkup in order to ensure that PLC memory was not damaged (memory checkup is done for safety reasons).Generally speaking, CPU unit makes a great number of check-ups of the PLC controller itself so eventual errors would be discovered early. You can simply look at any PLC controller and see that there are several indicators in the form. of light diodes for error signalization. System memory (today mostly implemented in FLASH technology) is used by a PLC for a process control system. Aside form. this operating system it also contains a user program translated forma ladder diagram to a binary form. FLASH memory contents can be changed only in case where user program is being changed. PLC controllers were used earlier instead of PLASH memory and have had EPROM memory instead of FLASH memory which had to be erased with UV lamp and programmed on programmers. With the use of FLASH technology this process was greatly shortened. Reprogramming a program memory is done through a serial cable in a program for application development. User memory is divided into blocks having special functions. Some parts of a memory are used for storing input and output status. The real status of an input is stored either as “1”or as “0”in a specific memory bit/ each input or output has one corresponding bit in memory. Other parts of memory are used to store variable contents for variables used in used program. For example, time value, or counter value would be stored in this part of the memory. PLC controller can be reprogrammed through a computer (usual way), but also through manual programmers (consoles). This practically means that each PLC controller can programmed through a computer if you have the software needed for programming. Today's transmission computers are ideal for reprogramming a PLC controller in factory itself. This is of great importance to industry. Once the system is corrected, it is also important to read the right program into a PLC again. It is also good to check from time to time whether program in a PLC has not changed. This helps to avoid hazardous situations in factory rooms (some automakers have established communication networks which regularly check programs in PLC controllers to ensure execution only of good programs). Almost every program for programming a PLC controller possesses various useful options such as: forced switching on and off of the system input/outputs (I/O lines), program follow up in real time as well as documenting a diagram. This documenting is necessary to understand and define failures and malfunctions. Programmer can add remarks, names of input or output devices, and comments that can be useful when finding errors, or with system maintenance. Adding comments and remarks enables any technician (and not just a person who developed the system) to understand a ladder diagram right away. Comments and remarks can even quote precisely part numbers if replacements would be needed. This would speed up a repair of any problems that come up due to bad parts. The old way was such that a person who developed a system had protection on the program, so nobody aside from this person could understand how it was done. Correctly documented ladder diagram allows any technician to understand thoroughly how system functions. Electrical supply is used in bringing electrical energy to central processing unit. Most PLC controllers work either at 24 VDC or 220 VAC. On some PLC controllers you'll find electrical supply as a separate module. Those are usually bigger PLC controllers, while small and medium series already contain the supply module. User has to determine how much current to take from I/O module to ensure that electrical supply provides appropriate amount of current. Different types of modules use different amounts of electrical current. This electrical supply is usually not used to start external 。
3.求一篇和PLC有关的英文文献,带中文翻译的,感激不尽
我在这里给你点搜索国际上常用的外文数据库： ---------------------------------------------------------- ❶ISI web of knowledge Engineering Village2 ❷Elsevier SDOL数据库 IEEE/IEE(IEL) ❸EBSCOhost RSC英国皇家化学学会 ❹ACM美国计算机学会 ASCE美国土木工程师学会 ❺Springer电子期刊 WorldSciNet电子期刊全文库 ❻Nature周刊 NetLibrary电子图书 ❼ProQuest学位论文全文数据库 ❽国道外文专题数据库 CALIS西文期刊目次数据库 ❾推荐使用ISI web of knowledge Engineering Village2 ----------------------------------------------------------- 中文翻译得自己做了，实在不成就谷歌翻译。
弄完之后，自己阅读几遍弄顺了就成啦。
4.急求外文翻译一篇3000字左右（PLC）
Development of PLC-based Tension Control SystemREN Sheng-le*, LU Hua, WANG Yong-zhang, FU Hong-yaDepartment of Mechanical Engineering, Harbin Institute of Technology, Harbin 150001, ChinaReceived 22 May 2006; accepted 22 November 2006AbstractFiber winding tension is an important factor in the molding techniques of composite material which influences the quality of winding product directly, and the tension control is a key technique in fiber winding techniques. This paper introduces a closed-loop tension control system with the programmable logic controller (PLC) with function modules as its control kernel, the alternating current (AC) servo motor as execute element and the radius-following device to accomplish the real-time radius compensation. The mechanism of the tension control system is analyzed and the numerical model is set up. The compensation technique of the radius of the scroll is analyzed. Experimental results show that the system is well qualified with high control precision and high reaction speed.*The components of composite material fiber winding possess such advantages as low weight, high strength, and high corrosion resistance, and they are widely applied in aviation and aerospace industry. Many researches have shown that improper or unstable tension leads to a strength loss of 20%-30% of the fiber wound components. An ideal tension control system should provide stable and adjustable tension during the winding process [1-3].With the development of the winding machine, tension controllers have, so far, undergone three stages of development, i.e., mechanical tension controller, electrical tension controller and computerized tension controller[4-5]. With the development of electronic technology and the appearance of the microprocessor of higher cost performance, computerized tension controller came into use. Microprocessor becomes the kernel of the control system and thus cuts down the number of circuits of the electronic control system, which greatly simplifies the system, improves its reliability and makes possible the application of advanced control methods. Therefore, this type of controllers is widely used[6-7].The tension control techniques are becoming mature and the specifications are being improved in some developed countries. However, the fiber winding industry of China started up late and still drops behind compared with the western countries.Mechanical tensioners, with low precision and slow response, account for the main part of domestically- applied tensioners, and cannot meet the tension requirements. Therefore, this paper presents a PLC-based tension control system.1 Set-up of the System Scheme1.1 Construction of the systemA winding tension control system generally consists of three main parts, namely the unwinder, the processer and the winder, and it may also include the measuring and control parts, ancillary transport apparatus, and a load cell. The type of the winder and that of the unwinder may be one of the two drive types, surface drive or center drive. The surface drive means that a scroll or belt is set on the surface of the winding material and the drive force is generated through friction. The center drive is to set a drive mechanism on the center shaft of the scroll, where the linear speed and the tension force of the winding fiber vary with the radius of the scroll, leading to the so-called “scroll thick”[8]. The phenomenon of “scroll thick” makes the tension control very complex, but the center drive mode is widely applied due to its wide applicability.1.2 Design of tension control schemeThis system adopts a scheme with a center drive and outward-draw fiber configuration. Since the output torque of the AC digital servo motor is in direct proportion to the fiber tension force and the scroll radius, the output torque should decrease as the scroll radius decreases to acquire a constant fiber tension. The change of the scroll radius can be measured by a radius following device and the sampled radius change then passes through an analog digital converter and is sent to the PLC. By reading the desired value of the tension force, the radius and tension force are calculated with the preset calculating algorithm. The speed instruction and torque limit instruction are issued and digital- to-analog converted to output the analog voltage signal to control the servo driver. The servo driver controls the rotating speed and output torque to control the fiber tension. The servo motor's speed and torque are measured by the pulse encoder and the Hall element and fed back to the PLC system to compose a closed。
5.求一篇PLC外文文献
A water pumping control system with a programmable logic controller (PLC) and industrial wireless modules for industrial plants—An experimental setup
ISA Transactions, In Press, Corrected Proof, Available online 3 December 2010
Ramazan Bayindir, Yucel Cetince 写过一次的采纳一下
6.plc的英文文献
[1]Michel Gilles.Programmabe Logic Controllers:Architecture and Application Wiley.1990.
[2]G.L.Batten. Programmabe Controllers:hardware.software and Application..New York:MC Graw-Hill.1994.
[3]Cheded.Al-Mulla. Control of a four-level elevator system using a programmable logic controller. International Journal of Electrical Engineering Education,2003
7.急求外文翻译一篇3000字左右（PLC）
Development of PLC-based Tension Control SystemREN Sheng-le*, LU Hua, WANG Yong-zhang, FU Hong-yaDepartment of Mechanical Engineering, Harbin Institute of Technology, Harbin 150001, ChinaReceived 22 May 2006; accepted 22 November 2006AbstractFiber winding tension is an important factor in the molding techniques of composite material which influences the quality of winding product directly, and the tension control is a key technique in fiber winding techniques. This paper introduces a closed-loop tension control system with the programmable logic controller (PLC) with function modules as its control kernel, the alternating current (AC) servo motor as execute element and the radius-following device to accomplish the real-time radius compensation. The mechanism of the tension control system is analyzed and the numerical model is set up. The compensation technique of the radius of the scroll is analyzed. Experimental results show that the system is well qualified with high control precision and high reaction speed.*The components of composite material fiber winding possess such advantages as low weight, high strength, and high corrosion resistance, and they are widely applied in aviation and aerospace industry. Many researches have shown that improper or unstable tension leads to a strength loss of 20%-30% of the fiber wound components. An ideal tension control system should provide stable and adjustable tension during the winding process [1-3].With the development of the winding machine, tension controllers have, so far, undergone three stages of development, i.e., mechanical tension controller, electrical tension controller and computerized tension controller[4-5]. With the development of electronic technology and the appearance of the microprocessor of higher cost performance, computerized tension controller came into use. Microprocessor becomes the kernel of the control system and thus cuts down the number of circuits of the electronic control system, which greatly simplifies the system, improves its reliability and makes possible the application of advanced control methods. Therefore, this type of controllers is widely used[6-7].The tension control techniques are becoming mature and the specifications are being improved in some developed countries. However, the fiber winding industry of China started up late and still drops behind compared with the western countries.Mechanical tensioners, with low precision and slow response, account for the main part of domestically- applied tensioners, and cannot meet the tension requirements. Therefore, this paper presents a PLC-based tension control system.1 Set-up of the System Scheme1.1 Construction of the systemA winding tension control system generally consists of three main parts, namely the unwinder, the processer and the winder, and it may also include the measuring and control parts, ancillary transport apparatus, and a load cell. The type of the winder and that of the unwinder may be one of the two drive types, surface drive or center drive. The surface drive means that a scroll or belt is set on the surface of the winding material and the drive force is generated through friction. The center drive is to set a drive mechanism on the center shaft of the scroll, where the linear speed and the tension force of the winding fiber vary with the radius of the scroll, leading to the so-called “scroll thick”[8]. The phenomenon of “scroll thick” makes the tension control very complex, but the center drive mode is widely applied due to its wide applicability.1.2 Design of tension control schemeThis system adopts a scheme with a center drive and outward-draw fiber configuration. Since the output torque of the AC digital servo motor is in direct proportion to the fiber tension force and the scroll radius, the output torque should decrease as the scroll radius decreases to acquire a constant fiber tension. The change of the scroll radius can be measured by a radius following device and the sampled radius change then passes through an analog digital converter and is sent to the PLC. By reading the desired value of the tension force, the radius and tension force are calculated with the preset calculating algorithm. The speed instruction and torque limit instruction are issued and digital- to-analog converted to output the analog voltage signal to control the servo driver. The servo driver controls the rotating speed and output torque to control the fiber tension. The servo motor's speed and torque are measured by the pulse encoder and the Hall element and fed back to the PLC system to compose a closed。
8.求一篇PLC外文文献
A water pumping control system with a programmable logic controller (PLC) and industrial wireless modules for industrial plants—An experimental setup
ISA Transactions, In Press, Corrected Proof, Available online 3 December 2010
Ramazan Bayindir, Yucel Cetince 写过一次的采纳一下