電大《機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

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1、專業(yè)好文檔 機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、 進行系統(tǒng)配置時有那些方法？具體含義是什么？ 答：1）類比法，通過相同規(guī)模系統(tǒng)的類比，大致確定可選用的廠家產(chǎn)品及機型。 2）估算法，估算I/O點數(shù)及模擬量路數(shù)，并確定要選用的機型。 3）計算法，依完整性原則計算所需的模塊數(shù)。這里可能有多個方案，那就應(yīng)計算出各個方案的結(jié)果。 4）計算各個方案的投入費用，并依經(jīng)濟性原則選其中最優(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功能？ 答：內(nèi)部繼電器區(qū)分為兩部分：一部分供輸入點/輸出點用，稱為輸入/輸出繼電器區(qū)；另一部分供PLC內(nèi)部

2、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10個通道000～009，其中，000，001通道是CPU單元輸入通道，002～009通道用于和CPU單元連接的擴展單元的輸入通道。 輸出繼電器區(qū)有10個通道010-019，其中，010，011通道用于CPU單元輸出通道，012～019通道用于和CPU單元連接的擴展單元的輸出通道。 保持繼電器具有斷電保持功能，即當(dāng)電源掉電時，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機架和擴展I/O機架插槽位的通道號是如何確定的？ 答：C200Ha PLC標(biāo)準(zhǔn)I/O單元在CPU機架和擴展I/O機架插槽位的

3、通道號的確定方法如下所示。 機架 槽1 槽2 槽3 槽4 槽5 槽6 槽7 槽8 槽9 槽10 CPU IR000 IR001 IR002 IR003 IR004 IR005 IR006 IR007 IR008 IR009 擴展機架1 IR010 IR011 IR012 IR013 IR014 IR015 IR016 IR017 IR018 IR019 擴展機架2 IR020 IR021 IR022 IR023 IR024 IR025 IR026 IR027 IR028 IR029 擴展機架3 IR30

4、0 IR301 IR302 IR303 IR304 IR305 IR306 IR307 IR308 IR309 4、 C200Ha PLC 的基本組成有那幾部分？ 答：C200Ha PLC的基本組成：一個提供系統(tǒng)總線和模塊插槽的安裝機架（母板），一個CPU單元、電源單元、若干個I/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)場設(shè)備（如傳感器等）輸出的多種模擬量信號轉(zhuǎn)換成PLC可讀的數(shù)字量形式。 它接受CPU單元發(fā)來的指令和相關(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。一旦其開關(guān)設(shè)置CPU指令和參數(shù)傳送完畢，

5、模擬量輸入單元就可獨立地完成A/D轉(zhuǎn)換及各項規(guī)定的功能，并不需要主CPU干預(yù)。它還可以對自身運行狀態(tài)和外部輸入信號范圍進行監(jiān)視，它對外部輸入信號進行連續(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)返回均是通過相應(yīng)的IR區(qū)和DM區(qū)來實現(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的數(shù)字量轉(zhuǎn)換為模擬信號輸出，以驅(qū)動現(xiàn)場模擬裝置。 模擬量輸出單元可以不需要主CPU干預(yù)而獨立運行，按照主CPU給定的參數(shù)輸出各路模擬量，并將運行狀態(tài)提供給CPU。命令、參數(shù)和狀態(tài)的傳送也是通過相應(yīng)的IR區(qū)和DM區(qū)來進行的。 模擬量輸出單元提供三種輸出功能：輸出限幅、輸出

6、極限報警和脈沖輸出，這些功能必須用編程器來設(shè)置，在用戶程序中不能改變這些數(shù)據(jù)。 7．編程時是怎樣處理梯形圖分支的？ 編程時一般應(yīng)用IL（連鎖）與ILC（連鎖清除）指令或者是暫存繼電器TR來實現(xiàn)梯形圖的分支結(jié)構(gòu)的。 ． 8.寫出圖1中的梯形圖的語句表。 1圖 ( a ) 00000 00001 00101 00100 00102 00103 00104 20002 20000 20001 00002 00003 00004 01000 20003 ( b ) 00000 00001 01000 00100 01000 01001

7、00101 01001 TIM000 #0050 TIM000 01002 解：(a) LD 00000 AND 00001 LD 00100 AND NOT 00101 LD NOT 20000 AND 20001 OR LD AND 00102 OR LD LD 00002 AND NOT 00003 AND 00004 LD NOT 00103 AND 00

8、104 AND NOT 20002 OR 20003 OR LD AND LD OUT 01000 END (b) LD 00000 OR 01000 AND NOT 00001 OUT 01000 AND 00100 OR 01001 AND NOT 00101 OUT

9、 01001 TIM 000 #0050 LD TIM000 OUT 01002 END 9．已知梯形圖及00000、00001的時序圖如圖2所示，畫出25501及01000、01001、01002、01003個元件的時序圖。（其中25501為0.2s脈沖輸出）。 00000 I 00000 SFT(10) 25501 2S 0.3S 00001 P 010 R 010 00001 2圖 解：時序圖如下： 0.3秒

10、2秒 00000 00001 25501 01000 01001 01002 01003 10．CMP(20)、BCMP (68)、TCMP（85）的作用分別是什么？ 答：CMP指令比較C1和C2兩個通道中數(shù)據(jù)的大??；BCMP指令將16個范圍值（上限和下限）以下限在前，上限在后的順序存放在以CB開始的32個連續(xù)通道中，然后將數(shù)據(jù)CD與這16個范圍值依次進行比較；TCMP指令將CD通道的內(nèi)容與TB開始的16個連續(xù)通道的內(nèi)容逐個進行比較。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

11、 on. We have to stop it; we need the courage to do it." His comments came 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

12、 been "exaggerated" by the Ivorian and the British media. Blatter, 77, said: "It 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 bec

13、ause it is against the spirit of football and against the visiting team. It is all nonsense. "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

14、of football." The (lack of) air up there Watch mCayman Islands-based Webb, the head of Fifas anti-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 tomo

15、rrow and I have asked to meet Yaya Toure," he told BBC Sport. "For me its about how he felt and I would like 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

16、, president of European footballs governing body, has also ordered an immediate investigation into the referees actions. 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 disa

17、ppointing news: Mission aborted. The supersonic descent could happen as early as Sunda. The weather plays an important role in 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, wit

18、h capsule attached, will move through the lower level of the atmosphere (the troposphere) where our day-to-day weather lives. It will 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 kilome

19、ters) and into the stratosphere. As he crosses the boundary layer (called the tropopause),e can expect a lot of turbulence. The balloon 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 plat

20、form. 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, 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 th

21、e big jump When 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

22、fast or spins out of control, he has a stabilization parachute that can be deployed to slow him down. His team hopes its not needed. Instead, he plans to deploy his 270-square-foot (25-square-meter) main chute at an altitude of around 5,000 feet (1,524 meters). In order to deploy this chute success

23、fully, he will have to slow to 172 mph (277 kph). He will have a reserve parachute that will open automatically if he loses consciousness at mach speeds. Even if everything goes as planned, it wont. Baumgartner still will free fall at a speed that would cause you and me to pass out, and no parachute is guaranteed to work higher than 25,000 feet (7,620 meters). cause there