【中英雙語】384關于可編程邏輯控制器單片機介紹概述有關的外文文獻翻譯成品：plc和微處理器mcu簡介（中英文雙語對照）

1、此文檔是畢業(yè)設計外文翻譯成品（ 含英文原文+中文翻譯） ，無需調整復雜的格 式！下載之后直接可用，方便快捷！本文價格不貴,也就幾十塊錢！一輩子也就一次的事！外文標題：Introductions of PLC and MCU外文作者：Sunita Chandrasekaran文獻出處: 2018 IEEE International Parallel & Distributed Processing Symposium Works

2、hops (如覺得年份太老，可改為近 2 年，畢竟很多畢業(yè)生都這樣做)英文 1357 單詞，8022 字符(字符就是印刷符)，中文 2327 漢字。 （如果字數(shù)多了，可自行刪減，大多數(shù)學校都是要求選取外文的一部分內容進行翻譯的。 ）Introductions of PLC and MCUA PLC is a device that was invented to replace the necessary sequential rela

3、y circuits for machine control. The PLC works by looking at its inputs and depending upon their state, turning on/off its outputs .The user enters a program, usually via software or programmer that gives the desired resu

4、lts.PLC are used in many “real world” applications. If there is industry present, chances are good that there is a PLC present. If you are involved in machining, packaging, material handling, automated assembly or countl

5、ess other industries, you are probably already using them. If you are not, you are wasting money and time. Almost any application that needs some type of electrical control has need for PLC.For example, let’s assume that

6、 when a switch turns on we want to turn a solenoid on for 5 seconds and then turn it off regardless of how long the switch is on for. We can do this with a simple external timer. What if the process also needed to count

7、 how many times the switch individually turned on? We need a lot of external counters.As you can see, the bigger the process the more of a need we have for a PLC. We can simply program the PLC to count its inputs and tur

8、n the solenoids on for the specified time.We will take a look at what is considered to be the “top 20” PLC instructions. It can be safely estimated that with a firm understanding of there instructions one can solve more

9、than 80% of the applications in existence.That‘s right, more than 80%! Of course we’ll learn more than just these instructions to help you solve almost ALL your potential PLC applications.The PLC mainly consists of a CPU

10、, memory areas, and appropriate circuits to receive input/output data, as shown in Fig. 19.1 We can actually consider the PLC to Typically the others are checking the system and updating the current and timer values.Step

11、 1-CHECK INPUT STATUS-First the PLC takes a look at each input to determine if it is on or off. In other words, is the sensor connected to the first input on? How about the second input? How about the third…It records th

12、is data into its memory to be used during the next step.Step 2-EXECUTE PROGRAM-Next the PLC executes your program one instruction at a time. Maybe your program said that if the first input was on then it should turn on t

13、he first output. Since is already knows which inputs are on/off from the previous step, it will be able to decide whether the first output should be turned on based on the state of the first input. It will store the exec

14、ution results for use later during the next step.Step 3-UPDATE OUTPUT STSTUS-Finally the PLC updates the status of outputs. It updates the outputs based on which inputs were on during the first step and the results of ex

15、ecuting your program during the second step. Based on the example in step 2 it would now turn on the first output because the first input was on and your program said to turn on the first output when this condition is tr

16、ue.After the third step the PLC goes back to step one and repeats the steps continuously. One scan time is defined as the time is takes to execute the 3 steps listed above. Thus a practical system is controlled to perfor

17、m specified operations as desired.The AT89S52 is a low-power, high-performance CMOS 8-bit microcontroller with 8Kbytes of in-system programmable Flash memory. The device is manufactured using Atmel’s high-density nonvola

18、tile memory technology and is compatible with the industry-standard 80C51 instruction set and pin-out. The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory prog

19、rammer. By combining a versatile 8-bit CPU with in-system programmable Flash on a monolithic chip, the Atmel AT89S52 is a powerful microcontroller which provides a highly-flexible and cost-effective solution to many embe

20、dded control applications.The AT89S52 provides the following standard features: 8K bytes of Flash, 256 bytes of RAM, 32 I/O lines, Watchdog timer, two data pointers, three 16-bit timer/counters, a six-vector two-level in