電大《機(jī)電控制與可編程控制器技術(shù)》習(xí)題分析與詳解（三）小抄參考

1、機(jī)電控制與可編程序控制器技術(shù)課程習(xí)題分析與詳解（三）1、 進(jìn)行系統(tǒng)配置時(shí)有那些方法？具體含義是什么？答：1）類比法，通過(guò)相同規(guī)模系統(tǒng)的類比，大致確定可選用的廠家產(chǎn)品及機(jī)型。2）估算法，估算i/o點(diǎn)數(shù)及模擬量路數(shù)，并確定要選用的機(jī)型。3）計(jì)算法，依完整性原則計(jì)算所需的模塊數(shù)。這里可能有多個(gè)方案，那就應(yīng)計(jì)算出各個(gè)方案的結(jié)果。4）計(jì)算各個(gè)方案的投入費(fèi)用，并依經(jīng)濟(jì)性原則選其中最優(yōu)者。2、 cpm1a plc的內(nèi)部繼電器是怎樣劃分的？那些繼電器有斷電保護(hù)功能？答：內(nèi)部繼電器區(qū)分為兩部分：一部分供輸入點(diǎn)/輸出點(diǎn)用，稱為輸入/輸出繼電器區(qū)；另一部分供plc內(nèi)部的程序使用，稱為內(nèi)部輔助繼電器區(qū)。輸入繼電器區(qū)有

2、10個(gè)通道000009，其中，000，001通道是cpu單元輸入通道，002009通道用于和cpu單元連接的擴(kuò)展單元的輸入通道。輸出繼電器區(qū)有10個(gè)通道010-019，其中，010，011通道用于cpu單元輸出通道，012019通道用于和cpu單元連接的擴(kuò)展單元的輸出通道。保持繼電器具有斷電保持功能，即當(dāng)電源掉電時(shí)，它們能夠保持掉電前的on/off狀態(tài)。3、 c200ha plc標(biāo)準(zhǔn)i/o單元在cpu機(jī)架和擴(kuò)展i/o機(jī)架插槽位的通道號(hào)是如何確定的？答：c200ha plc標(biāo)準(zhǔn)i/o單元在cpu機(jī)架和擴(kuò)展i/o機(jī)架插槽位的通道號(hào)的確定方法如下所示。機(jī)架槽1槽2槽3槽4槽5槽6槽7槽8槽9槽10c

3、puir000ir001ir002ir003ir004ir005ir006ir007ir008ir009擴(kuò)展機(jī)架1ir010ir011ir012ir013ir014ir015ir016ir017ir018ir019擴(kuò)展機(jī)架2ir020ir021ir022ir023ir024ir025ir026ir027ir028ir029擴(kuò)展機(jī)架3ir300ir301ir302ir303ir304ir305ir306ir307ir308ir3094、 c200ha plc 的基本組成有那幾部分？答：c200ha plc的基本組成：一個(gè)提供系統(tǒng)總線和模塊插槽的安裝機(jī)架（母板），一個(gè)cpu單元、電源單元、若干個(gè)i

4、/o單元或特殊i/o單元。5. 模擬量輸入單元具有哪些功能？答：模擬量輸入單元它可將現(xiàn)場(chǎng)設(shè)備（如傳感器等）輸出的多種模擬量信號(hào)轉(zhuǎn)換成plc可讀的數(shù)字量形式。它接受cpu單元發(fā)來(lái)的指令和相關(guān)參數(shù)完成相應(yīng)的功能，并將執(zhí)行的結(jié)果和狀態(tài)返回給主cpu。一旦其開(kāi)關(guān)設(shè)置cpu指令和參數(shù)傳送完畢，模擬量輸入單元就可獨(dú)立地完成a/d轉(zhuǎn)換及各項(xiàng)規(guī)定的功能，并不需要主cpu干預(yù)。它還可以對(duì)自身運(yùn)行狀態(tài)和外部輸入信號(hào)范圍進(jìn)行監(jiān)視，它對(duì)外部輸入信號(hào)進(jìn)行連續(xù)的、周期性的循環(huán)采樣和轉(zhuǎn)換。cpu將模擬量輸入單元的結(jié)果和狀態(tài)返回均是通過(guò)相應(yīng)的ir區(qū)和dm區(qū)來(lái)實(shí)現(xiàn)的。6. 模擬量輸出單元具有哪些功能？答：模擬量輸出單元將plc

5、的數(shù)字量轉(zhuǎn)換為模擬信號(hào)輸出，以驅(qū)動(dòng)現(xiàn)場(chǎng)模擬裝置。模擬量輸出單元可以不需要主cpu干預(yù)而獨(dú)立運(yùn)行，按照主cpu給定的參數(shù)輸出各路模擬量，并將運(yùn)行狀態(tài)提供給cpu。命令、參數(shù)和狀態(tài)的傳送也是通過(guò)相應(yīng)的ir區(qū)和dm區(qū)來(lái)進(jìn)行的。模擬量輸出單元提供三種輸出功能：輸出限幅、輸出極限報(bào)警和脈沖輸出，這些功能必須用編程器來(lái)設(shè)置，在用戶程序中不能改變這些數(shù)據(jù)。7編程時(shí)是怎樣處理梯形圖分支的？編程時(shí)一般應(yīng)用il（連鎖）與ilc（連鎖清除）指令或者是暫存繼電器tr來(lái)實(shí)現(xiàn)梯形圖的分支結(jié)構(gòu)的。 8.寫出圖1中的梯形圖的語(yǔ)句表。1圖( a )0000000001001010010000102001030010420002

6、20000200010000200003000040100020003( b )0000000001010000010001000010010010101001tim000#0050tim00001002 解：(a)ld 00000and 00001ld 00100and not 00101ld not 20000and 20001or ldand 00102or ldld 00002and not 00003and 00004ld not 00103and 00104and not 20002or 20003or ld and ldout 01000end (b) ld 00000 or 0

7、1000 and not 00001 out 01000 and 00100 or 01001 and not 00101 out 01001 tim 000 #0050ld tim000out 01002end9已知梯形圖及00000、00001的時(shí)序圖如圖2所示，畫(huà)出25501及01000、01001、01002、01003個(gè)元件的時(shí)序圖。（其中25501為0.2s脈沖輸出）。00000i00000sft(10)255012s0.3s00001p 010r 010000012圖解：時(shí)序圖如下：0.3秒2秒0000000001255010100001001010020100310cmp(20

8、)、bcmp (68)、tcmp（85）的作用分別是什么？答：cmp指令比較c1和c2兩個(gè)通道中數(shù)據(jù)的大小；bcmp指令將16個(gè)范圍值（上限和下限）以下限在前，上限在后的順序存放在以cb開(kāi)始的32個(gè)連續(xù)通道中，然后將數(shù)據(jù)cd與這16個(gè)范圍值依次進(jìn)行比較；tcmp指令將cd通道的內(nèi)容與tb開(kāi)始的16個(gè)連續(xù)通道的內(nèi)容逐個(gè)進(jìn)行比較。若相等，則在結(jié)果通道r的相應(yīng)位上置1；否則，清0。if we dont do that it will go on and go on. we have to stop it; we need the courage to do it.his comments came

9、hours after fifa vice-president jeffrey webb - also in london for the fas celebrations - said he wanted to meet ivory coast international toure to discuss his complaint.cska general director roman babaev says the matter has been exaggerated by the ivorian and the british media.blatter, 77, said: it

10、has been decided by the fifa congress that it is a nonsense for racism to be dealt with with fines. you can always find money from somebody to pay them.it is a nonsense to have matches played without spectators because it is against the spirit of football and against the visiting team. it is all non

11、sense.we can do something better to fight racism and discrimination.this is one of the villains we have today in our game. but it is only with harsh sanctions that racism and discrimination can be washed out of football.the (lack of) air up there watch mcayman islands-based webb, the head of fifas a

12、nti-racism taskforce, is in london for the football associations 150th anniversary celebrations and will attend citys premier league match at chelsea on sunday.i am going to be at the match tomorrow and i have asked to meet yaya toure, he told bbc sport.for me its about how he felt and i would like

13、to speak to him first to find out what his experience was.uefa hasopened disciplinary proceedings against cskafor the racist behaviour of their fans duringcitys 2-1 win.michel platini, president of european footballs governing body, has also ordered an immediate investigation into the referees actio

14、ns.cska said they were surprised and disappointed by toures complaint. in a statement the russian side added: we found no racist insults from fans of cska.baumgartner the disappointing news: mission aborted.the supersonic descent could happen as early as sunda.the weather plays an important role in

15、this mission. starting at the ground, conditions have to be very calm - winds less than 2 mph, with no precipitation or humidity and limited cloud cover. the balloon, with capsule attached, will move through the lower level of the atmosphere (the troposphere) where our day-to-day weather lives. it w

16、ill climb higher than the tip of mount everest (5.5 miles/8.85 kilometers), drifting even higher than the cruising altitude of commercial airliners (5.6 miles/9.17 kilometers) and into the stratosphere. as he crosses the boundary layer (called the tropopause),e can expect a lot of turbulence.the bal

17、loon will slowly drift to the edge of space at 120,000 feet ( then, i would assume, he will slowly step out onto something resembling an olympic diving platform.below, the earth becomes the concrete bottom of a swimming pool that he wants to land on, but not too hard. still, hell be traveling fast,

18、so despite the distance, it will not be like diving into the deep end of a pool. it will be like he is diving into the shallow end.skydiver preps for the big jumpwhen he jumps, he is expected to reach the speed of sound - 690 mph (1,110 kph) - in less than 40 seconds. like hitting the top of the water, he will begin to slow as he approaches the more dense air closer to earth. but this will not be enough to stop him completely.if he goes too fast or spins out of control, he has a stabilizat