简论电气毕业论文英语文献原文翻译.doc

　　简论电气毕业论文英语文献原文+翻译简论电气毕业论文英语文献原文+翻译导读：ofthesystem.asmanytimesasneeded.Therefore,timecanbesaved,riskofmistakesreducedandplexitycanbeincreasedusingthesameelements.AconventionalPLC,thatispossibletofin外文翻译 院 （系）专业班级 姓 名 学 号 指导教师 年 月 日 Programmable designed for electro-pneumatic systemscontrollerJohn F.s and the programmable controller that provides an effective and easy atic actuators movement and the states of pneumatic system. The project of a specific controller for pneumatic applications join the study of automation design and the control processing of pneumatic systems icrocontrollers to implement the resources of the controller.1. IntroductionThe automation systems that use electro-pneumatic technology are formed mainly by three kinds of elements: actuators or motors, sensors or buttons and control elements like valves. Noost of the control elements used to execute the logic of the system mable Logic Controller (PLC). Sensors and s executes all the logic necessary to the sequence of the movements, simulates other ponents like counter, timer and control the status of the system. as many times as needed. Therefore, time can be saved, risk of mistakes reduced and plexity can be increased using the same elements.A conventional PLC, that is possible to find on the market from many panies, offers many resources to control not only pneumatic systems, but all kinds of system that uses electrical ponents. The PLC can be very versatile and robust to be applied in many kinds of application in the industry or even security system and automation of buildings.Because of those characteristics, in some applications the PLC offers to much 第 2 页 resources that are not even used to control the system, electro-pneumatic system is one of this kind of application. The use of PLC, especially for small size systems, can be very expensive for the automation project.An alternative in this case is to create a specific controller that can offer the exactly size and resources that the project needs [3, 4]. This can be made using microcontrollers as the base of this controller.The controller, based on microcontroller, can be very specific and adapted to only one kind of machine or it can med as a usual PLC and uch experience the designer has icrocontroller. But the main advantage of design the controller icrocontroller is that the designer has the total knoakes it possible to control the size of the controller, change the plexity and the application of it. It means that the project gets more independence from other panies, but at the same time the responsibility of the control of the system stays at 5 6 7 简论电气毕业论文英语文献原文+翻译(2)导读：emoryofthemicrocontroller,sotheycanbereadandexecuted.Thecontrollertaskisnottoepleofaversatilecontrollerthatisdesignforanspecificarea.AconventionalPLCprocessthecontrolofthesystemusinthe designer hands2. Electro-pneumatic systemOn automation system one can find three basic ponents mentioned before, plus a logic circuit that controls the system. An adequate technique is needed to project the logic circuit and integrate all the necessary ponents to execute the sequence of movements properly.For a simple direct sequence of movement an intuitive method can be used [1, 5], but for indirect or more plex sequences the intuition can generate a very plicated circuit and signal mistakes. It is necessary to use another method that can save time of the project, make a clean circuit, can eliminate occasional signal overlapping and redundant circuits. The presented method is called step-by-step or algorithmic [1, 5], it is valid for pneumatic and electro-pneumatic systems and it ethod consists of designing the systems based on standard circuits made 第 3 页 for each change on the state of the actuators, these changes are called steps. The first part is to design those kinds of standard circuits for each step, the next task is to link the standard circuits and the last part is to connect the control elements that receive signals from sensors, sovements, and give the air or electricity to the supply lines of each step. In Figs. 1 and 2 the standard circuits are draatic and electro-pneumatic system [8]. It is possible to see the relations ethod applied inside the controllerThe result of the method presented before is a sequence of movements of the actuator that is eans that each change on the position of the actuators is a ne and the transition bets and to define the condition to each change bet is defined by a sequence that never chances and states that have the inputs and the outputs icrocontroller and is executed the same med inside the controller ore for the other configurations and auxiliary functions of the step. After programming, this sequence of strings is saved inside of 。