畢業(yè)設(shè)計(jì)(論文)外文參考資料及譯文-基于plc的磨板廢水自動(dòng)控制處理系統(tǒng)設(shè)計(jì)(已修改)
2025-06-22 14:30 本頁面
【正文】 畢 業(yè) 設(shè) 計(jì)（論 文） 外 文 參 考 資 料 及 譯 文 設(shè)計(jì) (論文 )題目： 基于 PLC 的磨板廢水自動(dòng)控制處理系統(tǒng)設(shè)計(jì) 學(xué)生姓名： 張鳳林 學(xué) 號(hào)： 0704111019 專 業(yè)： 自動(dòng)化 所在學(xué)院： 機(jī)電工程學(xué)院 指導(dǎo)教師： 李志臣 職 稱： 講師 2021 年 2 月 20 日 Control Devices and PLC Joseph La Fauci From Wikipedia, the free encyclopedia Several types of control devices are used in industry to satisfy the following control needs. Mechanical Control 、 Pneumatic Control 、 Electromechanical Control、 Electronic Control、 Computer Control、 Programmable Logic Control (PLC) Mechanical control includes cams and governors. Although they have been used for the control of very plex machines, to be cost effectively, today they are used for simple and fixedcycle task control. Some automated machines, such as screw machines, still use cambased control. Mechanical control is difficult to manufacture and is subject to wear. Pneumatic control is still very popular for certain applications. It uses pressed air, valves, and switches to construct simple control logic, but is relatively slow. Because standard ponents are used to construct the logic, it is easier to build than a mechanical control. Pneumatic control parts are subject to wear. As does a mechanical control, an electromechanical control use switches, relays, timers, counters, and so on, to construct logic. Because electric current is used, it is faster and more flexible. The controllers using electromechanical control are called relay devices. Electric control is similar to electromechanical control, except that the moving mechanical ponents in an electromechanical control device are replaced by electronic switches, which works faster and is more reliable. Computer control is the most versatile control system. The logic of the control is programmed into the puter memory using software. It not only can be for machine and manufacturing system control, but also for data munication. Very plex control strategies with extensive putations can be programmed. The first is the interface with the outside world. Internally, the puter uses a low voltage (5 to 12 volts) and a low current (several milliamps). Machine requires much higher voltages (24, 110, or 220 voltages) and currents (measured in amps). The interface not only has to convert the voltage difference, but also must filter out the electric noise usually found in the shop. The interface thus must be custombuilt for each application. In order to use the advantages of all those controllers and eliminate the difficulties, the programmable logic controllers were invented. A PLC was a replacement for relay devices. They are programmed using a ladder diagram, which is standard electric wiring diagram. As PLCs bee more flexibility, highlevel as well as lowlevel languages are available to PLC programmers. PLCs have the flexibility of puters as well as a standard and easy interface with processes and other devices. They are widely accepted in industry for controlling from a single device to a plex manufacturing facility. Automatic of many different processes, such as controlling machines or factory assembly lines, is done through the use of small the puters called a programmable logic controller (PLC), PLCs were first created to serve the automobile industry, and the first PLC project was developed in 1968 for General Motors
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