PLC毕业设计的外文文献及翻译

1、华北科技学院毕业设计（论文）PLC technique discussion and future developmentT.J .byersElectr onic Test Equipme nt-pri nciples and Applicati onsPrin cet on Un iversity .AmericaAlong with the developme nt of the ages, the tech nique that is no wadays is also gradually perfect, the competition plays more strong; the

2、operation that list depends the artificial has already cant satisfied with the current manufacturing industry foreground, also cant guara ntee the request of the higher qua ntity and high new the image of the tech nique bus in ess en terprise.The people see in produce practice, automate brought the

3、treme ndous convenience and the product qua ntities for people up of assura nee, also eased the pers onnels labor stre ngth, reduce the establishme nt on the pers onn el. The target con trol of the hard realizati on in many complicated product ion lin es, whole and excelle nt turn, the best decisi o

4、n etc, well-trai ned operati on work, tech ni cal pers onnel or expert, gover nor but can judge and operate easily, can acquire the satisfied result. The research target of the artificial intelligence makes use of the calculator exactly to carry out, imitate these intelligences behavior, moderating

5、the work through pers ons brain and calculators, with the mode that pers ons mach ine comb ine, for resolve the very complicated problem to look for the best path.We come in sight of the control that links after the electric appliances in various situation, that is already the that time generation p

6、ast, now of after use in the mold a perhaps simple equipments of grass-roots control that the electric appliances can do for the low level only; And the PLC emergence also became the epoch-making topic, adding the vivid software con trol through a very and stable hardware, making the automati on hea

7、d for the new high tide.The PLC biggest characteristics lie in: The electrical engineering teacher already no Ion ger electric hardware up too many calculati ons of cost, as long as order the importati on that the butt on switch or the importati on of the sen sors order to link the PLC up can solve

8、problem, pass to output to order the conjunction con tact mach ine or con trol the start equipments of the big power after the electric appliances, but the exportation equipments direct conjunction of the small power can.PLC internal containment have the CPU of the CPU, and take to have an 1/ O for

9、expand of exterior to connect a peoples addressand saving machine three big pieces to constitute, CPU core is from an or many is tired to add the mach ine to con stitute, mathematics that they have the logic operatio n ability, and can read the procedure save the contents of the mach ine to drive th

10、e homologous sav ing mach ine and I/ Os to connect after pass the calculati on; The I/ O add inner part is tired the in put and output system of the machi ne and exterior link, and deposit the related data into the procedure saving machine or data saving machine; The saving mach in e can deposit the

11、 data that the I/ O in put in the sav ing machi ne, and in work adjust ing to become tired to add the mach ine and I/ Os to conn ect, sav ing mach ine separately sav ing machine RAM of the procedure saving machine ROM and dates, the ROM can do deposit of the data permanence in the saving machine, bu

12、t RAM only for the CPU computes the temporary calculati on usage of hour of buffer space.The PLC anti- interference is very and excellent, our root need not concern its service life and the work situati on bad, these all problems have already no Ion ger become the topic that we fail, but stay to our

13、 is a concern to come to internal resources of make use of the PLC to strengthen the control ability of the equipments for us, make our equipments more gentle.PLC Ian guage is not we imag ine of edit collected materials the Ian guage or Ian guage of Cs to carry on weav ing the dista nce, but the tra

14、pezoid diagram that the adopti on is orig inal after the electric applia nces to con trol, make the electrical engin eeri ng teacher while weav ing to write the procedure very easy comprehended the PLC Ianguage, and a lot of non- electricity professi onal also very quickly know and go deep into to t

15、he PLC.Is PLC one of the advantage above and only, this is also one part that the people comprehe nd more and easily, in a lot of equipme nts, the people have already no Ion ger hoped to see too many control buttons, they damage not only and easily and produce the artificial error easiest, small is

16、not a main error perhaps you can still accept; But lead eve n is a fatal error greatly is what we cant is tolerant of. New technique always for bringing more safe and convenient operati on for us, make we a lot of problems for face on sweep but light, do you understand the HMI? Says the HMI here you

17、 basically not clear what it is, also have no in terest un dersta nding, cha nge one in side text expla ins it into the touch to hold or man-mach ine in terface you kn ew, it comb ines with the PLC to our larger space.HMI the con trol not only is reduced the con trol press butt on, in crease the viv

18、id of the con trol, more main of it is can seque nee of, and at can the cha nge data in put to output the feedback with data, control in the temperature curve of imitate but also can keep the manifestation of view to come out. And can write the function help procedure through a plait to provide the

19、help of various what lies in ones power, the one who make operate reduces the otiose error. Currently the HMI factory is also more and more, the function is also more and more strong, the price is also more and more low, and the no odles of the usage are wide more and more. The HMI foreground can sa

20、y that think to be good.At a lot of situations, the list is a smooth movement that cant guarantee the equipments by the con trol of the sin gle mach ine, but pass the in formati on excha nges of the equipme nts and equipme nts to attai n the result that we want. For example fore pack and the exam in

21、 ati on of the empress work preface, we will arrive wrapp ing in formatio n feedback to exam ine the place, and exam ine the in formati on of the place to also want the feedback to pack ing. Pass the information share thus to make both the chain connect, becoming a total body, the match of your that

22、 thus make is more close, at each other attain to reflect the result that mutually flick.The PLC corresp onden cehas already come more body now its value, at the PLC and corresp ondence betwee n Places, can pass the com muni cati on of the in formati on and the share of the data to guaranteethat of

23、the equipments moderatesmutually, the result that arrive already to repair with each other. Data conv ersi on the adopti on RS232 betwee n PLC connect to come to the transmission data, but the RS232 pick up a people and can guarantee 10 meters only of deliver the distanee, if in the distance of 1000

24、 meters we can pass the RS485 to carry on the corresp onden ce, the Ion ger dista nce can pass the MODEL only to carry on deliver.The PLC data transmission is just to be called a form to it in a piece of and continuous address that the data of the inner part delivers the other party, we, the PLC of

25、the other party passes to read data in the watch to carry on the operation. If the data that data in the watch is a to establish gen erally, that is just the gen eral data tran smissi on, for example today of oil price rise, I want to deliver the price of the oil price to lose the oil ally on board,

26、 that is the share of the data; But take data in the watch for an instruction procedure that controls the PLC, that had the difficulty very much, for example you have to con trol onepedestal robot to press the action work that you imagine, you will draw up for it the form that a procedure combine wi

27、th the data sends out to pass by.The form that in formatio n tran sport con tai n sin gle work, the half a work and the difference of a workers .The meaning of the single work also is to say both, a can send out only, but a can receive only, for example a spy he can receive the desig natio n of the

28、superior only, but cant give the superior reply; A work of half is also 2 and can send out similar to accept the data, but cant send out and accept at the same time, for example whe n you make a phone call is to cant answer the phone, the other party also; But whole pair works is both can send out a

29、nd accept the data, and can send out and accept at the same time. Be like the Internet is a typical example.The process that information transport also has synchronous and different step cent: The data line and the clock lines are synchronous when synchronous meaning lie in sending out the data, is

30、also the data signal and the clock signals to be carry on by the CPU to send out at the same time, this needs to all want the specialized clock signal each other to carry on the transmission and connect to send, and is constrained, the characteristics of this kind of method lies in its speed very qu

31、ick, but correspond work time of take up the CPU and also want to be long oppositely, at the same time the technique difficulty also very big. Its request lies in canting have an error marg ins in a dates deliver, otherwise the whole piece accordi ng to compare the occurrence mistake, this on the ha

32、rdware is a bigger difficulty. Applied more and more extensive in some appropriative equipments, be like the appropriative medical treatment equipments, the numerical signal equipments.etc., in compare the one data deliver, its result is very good.And the differe nt step is an applicati on the most

33、exte nsive, this receive ben efit in it of technique difficulty is opposite and want to be small, at the same time not need to prepare the specialized clock signal, its characteristics to lie in, its data is partition, the Iong-lost send out and accept, be the CPU is too busy of time can grind to a

34、stop sex to work, also reduced the difficulty on the hardware, the data throw to lose at the same time opposite want to be little, we can pass the exam ination of the data to observe whether the data that we send out has the mistake or not, be like strange accidentally the method, tired addition and

35、 eight efficacies method etc, can use to helps whether the data that we exam ine to send out have or not the mistake occurre nee, pass the feedback to carry on the discrim in ator.A line of transmission of the information contains a string of and combines the cent of: The usual PLC is 8 machines, ce

36、rtainly also having 16 machines. We can be at the time of sending out the data a send out to the other party, also can be 88 send out the data to the other party, and 8 differentiations are also the as that we say to send out the data and combine sends out the data. A speed is more and slowly, but a

37、s long as 2 or three lines can solve problem, and can use the teleph one line to carry on the long range con trol. But comb ine the ocular tran smissi on speed is very quick of, it is a stri ng of ocular of 25600%, occupy the adva ntage in the short distanee, the in view of the fact TTL electricity

38、is even, being limited by the scope of one meter gen erally, it comb ine un well used for the data tran smissi on of the long pull, thus the cost is too expe nsive.Under a lot of circumstances we are total to like to adopt the string to combine the conversion chip to carry on deliver, under this kin

39、d of circumstance not need us to carry on to deposited the machi ne to establish too and complicatedly, but carry on the data excha nges through the data transmission instruction directly, but is not a very viable way in the correspondence, because the PLC of the other party must has been wait for y

40、our data exportation at the time of sending out the data, it cant do other works.Whe n you are readi ng the book, you hear some one knock on door, you stop to start up of affair, ope n the door and comb ine to continue with the one who knock on door a dialogue, the teleph one of this time rang, you

41、sig nal hint to connect a telepho ne, after connecting the teleph one through, retur n overdo come together knock on door to have a con versati on, after dialogue complete, you con ti nue aga in to see your book, this kind of circumsta nce we are called the interruption to it, it has the authority,

42、also having sex of have the initiative, the PLC had such function .Its characteristics lie in us and may meet the urgently abrupt affairs in the operati on process of the equipme nts, we want to stop to start immediately up of work, the whereabouts man ages the more importa nt affair, this ki nd of

43、circumsta nce is we usually meet of, PLC while carry out urge nt missi on, total will keep the curre nt appeara ncefirst, for example the address of the procedure, CPU of tired add the machine data etc., be like to stick down which the book that we see is when we open the door the page or simply mak

44、e a mark, because we treat and would still need to continue immediately after book of see the behind.The CPU always does the affair that should do accord ing to our will, but your mistake of give it an affair, it also would be same to do, this we must notice.The in terruptio n is not only a, sometim

45、es exist ing joi ntly with the hour several in side break, break off to have the preferred Class, they will carry out the interruption of the higher Class accord ing to pers ons request. This kind of breaks off the medium in terrupti on to also became to break off the set. The Class that certa inly

46、breaks off is releva nt accordi ng to various resources of CPU with internal PLC; also following a heap of capacity size of also releva nt faste n.The contents that break off has a lot of kin ds, for example the exterior break off, corresp ondence in of send out and accept the in terrupti on and set

47、tle and the clock that count break off, still have the WDT to reset the interruption etc., they enriched the CPU to respond to the category while han dle various bus in ess. Speak thus perhaps you cant comprehe nd the internal structure and operation orders of the interruption completely also, we do

48、 a very small example to expla in.Each equipme nt always will not forget a butt on, it also is at we meet the urge nt circumsta nce use of that is n asty to stop the butt on. When we meet the Huma n body trouble and surprised circumstances we as long as press it, the machine stops all operations imm

49、ediately, and wait for process ing the over surprised empress recover the operati on aga in. Nasty stop the internal 1/ O of the internal CPU of the butt on conjunction PLC to connect up, be to press butt on an exterior to trigger sig nal for CPU, the CPU carries on to the I/ O to exam ine aga in, b

50、eing to confirm to have the exterior to trigger the sig nal, CPU protect ion the spot breaks off procedure counts the mach ine turn the homologous exterior I/ O automatically in the procedure to go to also, be exterior in terrupti on procedure process ing complete, the procedure counts the machine t

51、o return the main procedure to continue to work. Have 1:00 can what to explai n is we gen erally would n asty stop the butt on of exterior break off to rise to the tallest Class, thus guara ntee the safety.Whe n we are work a work piece, giving the PLC a sig nal, counting PLC inner part the mach ine

52、 add 1 to compute us for a day of workload, a count the machi ne and can solve problem in brief, certa inly they also can keep the data un der the con diti on of dropp ing the electricity, urging the data not to throw to lose, this is also what we hope earnestly.The PLC still has the fun cti on that

53、 the high class counts the mach ine, being us while accept some dates of high speed, the high speed that here say is the data of the in all aspects tiny second class, for example the bar code scanner is scanning the data continuously, calculati ng high-speed sig nal of the data processor DSP etc., w

54、e will adopt the high class to count the machine to help we carry on count. It at the PLC carries out the procedure once discover that the high class counts the machine to should of interruption, will let go of the work on the hand immediately. The trapezoid diagram procedure that passes by to weave

55、 the distance again explains the high class for us to carry out procedure to count machine would automatic performance to should of work, thus rise the Class that the high class counts the mach ine to high one Class.You heard too many this phrases perhaps: crash, the meaning that is mostly is a work

56、load of CPU to lead greatly, the internal resources shortage etc. the circumsta nce cant result in procedure circulate. The PLC also has the similar circumstance, there is a watchdog WDT in the inner part of PLC, we can establish time that a procedure of WDT circulate, being to appear the procedure

57、to jump to turn the mistake in the procedure movement process or the procedure is busy, moveme nt time of the procedure exceeds WDT con stituti on time, the CPU turn but the WDT reset the appeara nce. The procedure restarts the moveme nt, but will not carry on the breakage to the interruption.The PL

58、C developme nt has already en tered for n etwork ages of corresp ondence from the mode of the one, and together other works control the net plank and 1/ O card planks to carry on the share easily. A state software can pass all se hardwires link, more ani mati on picture of keep the view to carries o

59、n the con trol, and cans pass the Internet to carry on the con trol in the foreig n land, the blast-off that is like the absolute being boat No.5 is to adopt this kind of way to make airship go up the sky.The development of the higher layer needs our continuous effort to obtain. The PLC emerge nce has already affected a few pers ons fully, we also obta ined more kno wledge and precepts from the top one experie nce of the gen eratio n, coming to the con ti nu ous developm