電大機(jī)電控制與可編程序控制器技術(shù)期末復(fù)習(xí)指導(dǎo)(文本)小抄參考

1、專業(yè)好文檔機(jī)電控制與可編程序控制器技術(shù)期末復(fù)習(xí)指導(dǎo)（文本）李：同學(xué)們好！本次課圍繞機(jī)電控制與可編程序控制器復(fù)習(xí)重點(diǎn)的討論展開。我先將本課程復(fù)習(xí)重點(diǎn)一一點(diǎn)出，然后解答同學(xué)們的問(wèn)題。趙：通常說(shuō)的plc的點(diǎn)數(shù)，也就是說(shuō)幾點(diǎn)的plc，就是指輸入點(diǎn)和輸出點(diǎn)的和嗎？李：正確。趙：寶雞電大10春機(jī)械設(shè)計(jì)趙衛(wèi)哲求教李：子程序出于局部控制需要。趙：可編程 控制器的應(yīng)用有哪些？李：工業(yè)控制系統(tǒng)。趙：臨近考試了，老師可否框定一下考試的范圍。李：第1、2、3、5、7、8章。趙： plc是如何與伺服電機(jī)聯(lián)系的李：接口通過(guò)驅(qū)動(dòng)電路連接。顧：在繪制梯形圖的時(shí)候，如何把握各種指令的運(yùn)用規(guī)則李：指令的運(yùn)用建立在對(duì)指令的充分理解

2、上。黨：電氣控制線路的設(shè)計(jì)需要注意什么？李：循序設(shè)計(jì)規(guī)律。尹：可編程控制器有實(shí)習(xí)課程嗎？李：有實(shí)習(xí)及課程設(shè)計(jì)。薛：電器控制系統(tǒng)中常用的手動(dòng)電器有刀開關(guān)、組合開關(guān)、按鈕等。李：請(qǐng)參看低壓電器部分。陳：如何學(xué)好機(jī)電控制這門課？大家交流一下，共同進(jìn)步！李：理論聯(lián)系實(shí)際。閔： plc編程，歐姆龍公司產(chǎn)品與三菱公司的產(chǎn)品編程有區(qū)別嗎？我見到很多地方用的是三菱的李：基本指令大致相同，符號(hào)不同。編程方法相同。陳：就要考試了，請(qǐng)問(wèn)大家都是怎么復(fù)習(xí)的呀，有沒(méi)有重點(diǎn)方面的呢？和大家分享一下，共同進(jìn)步。馬：只是書和往年試卷李：復(fù)習(xí)形成性考核作業(yè)，考題大多來(lái)自于其中。陳： plc基本硬件由那幾部分組成？各部分的主要作

3、用是什么？李：請(qǐng)參看相關(guān)章節(jié)。孫：基準(zhǔn)的定義是什么李：從字意上解釋基本準(zhǔn)則。孫：咱們國(guó)家有自己的plc專利嗎？李：有，上海等廠家生產(chǎn)相關(guān)產(chǎn)品。 機(jī)電控制與可編程序控制器復(fù)習(xí)重點(diǎn)復(fù)習(xí)重點(diǎn)章節(jié)：第一、二、三、四、七、八章第一章 常用低壓控制電器手動(dòng)電器：刀開關(guān)、組合開關(guān)、按鈕自動(dòng)電器：接觸器，繼電器（電磁式繼電器、熱繼電器、時(shí)間繼電器），行程開關(guān)，熔斷器執(zhí)行電器：電磁鐵等要求：掌握上述電器的功能、符號(hào)、應(yīng)用場(chǎng)所考核題型：（填空、問(wèn)答）填空舉例：接觸器的觸點(diǎn)分為 和 。 用來(lái)通斷大電流的主電路， 用來(lái)通斷小電流的控制電路問(wèn)答舉例：在電動(dòng)機(jī)的控制線路中，熱繼電器的作用是什么？可否用熔斷器和過(guò)電流繼電器

4、代替？為什么？第二章 電器控制基礎(chǔ)控制線路的常用基本回路點(diǎn)動(dòng)、聯(lián)鎖式互鎖、多點(diǎn)、順序、循環(huán)鼠籠式異步電機(jī)起動(dòng)控制線路全壓直接、降壓異步電機(jī)正反轉(zhuǎn)控制線路要求：掌握上述控制線路的工作過(guò)程考核題型：?jiǎn)柎?、讀圖分析問(wèn)答題舉例：在三相異步電機(jī)控制線路中，常 采用的起動(dòng)方法有哪幾種？讀圖分析舉例：第三章 電器控制系統(tǒng)的設(shè)計(jì)基礎(chǔ)設(shè)計(jì)方法：、經(jīng)驗(yàn)設(shè)計(jì)方法、邏輯設(shè)計(jì)方法設(shè)計(jì)步驟：設(shè)計(jì)規(guī)律： 考核題型：（問(wèn)答）問(wèn)答舉例：在交流控制回路中，兩個(gè)同時(shí)動(dòng)作的繼電器線圈可以串聯(lián)連接嗎？為什么？第四章 可編程序控制器概述掌握：plc的基本概念、硬件結(jié)構(gòu)、基本工作原理、性能指標(biāo)基本概念： plc與繼電器控制線路比較相同處：

5、輸入設(shè)備、輸出設(shè)備不同處：控制部分（環(huán)節(jié)）硬件結(jié)構(gòu)：中央處理單元（cpu）、存儲(chǔ)器單元、輸入/輸出接口單元基本工作原理：循環(huán)掃描過(guò)程性能指標(biāo)：熟悉：plc分類以結(jié)構(gòu)形式分類 以控制規(guī)模分類 考核題型：?jiǎn)柎穑ㄒ娦纬尚钥己俗鳂I(yè)）第七章 可編程序控制器的編程語(yǔ)言掌握梯形圖編程的格式、特點(diǎn)、規(guī)則、梯形圖的畫法掌握基本指令、功能指令基本指令：ld、out、and、or、not、end、and ld、or ld功能指令：il ilc、jmp jme、tr、keep、difu difd、tim、cnt、sft、 mov、cmp考核題型：?jiǎn)柎?、梯形圖改錯(cuò)、根據(jù)梯形圖寫指令問(wèn)答例 ：編程時(shí)怎樣實(shí)現(xiàn)梯形圖分支的？

6、梯形圖改錯(cuò)（一般規(guī)則）a.觸點(diǎn)在線圈左側(cè)b.左邊母線不能與線圈直接相連c.輸出線圈不能串聯(lián)d.tc區(qū)不能重復(fù)使用梯形圖改錯(cuò)例根據(jù)梯形圖寫指令ld not 00005and 00006ld 00002and 00004or ldand 00001and not 00003ld 00008and not 00009or ldand 00007out 00100end第八章 可編程序控制器系統(tǒng)設(shè)計(jì)及應(yīng)用舉例掌握梯形圖的基本電路啟動(dòng)停電路雙向控制電路單按鈕啟停控制電路定時(shí)器和計(jì)數(shù)器的應(yīng)用控制電路（6個(gè)） 掌握梯形圖經(jīng)驗(yàn)設(shè)計(jì)方法：參照典型電路（基本電路），進(jìn)行修改和完善，針對(duì)邏輯關(guān)系較簡(jiǎn)單的控制電路。掌

7、握梯形圖的順序控制設(shè)計(jì)方法?？己祟}型：分析程序功能、設(shè)計(jì)題1、分析程序功能：梯形圖程序如圖所示，分析00000、00001對(duì)01000、01001的控制作用。 2、由兩臺(tái)三相交流電動(dòng)機(jī)m1、m2組成的控制系統(tǒng)的主回路和plc控制電路如圖所示。按起動(dòng)按鈕sb1，m1電動(dòng)機(jī)起動(dòng)，過(guò)5秒后m2電動(dòng)機(jī)起動(dòng)，按停止按鈕sb2電動(dòng)機(jī)m1、m2停止；若m1電動(dòng)機(jī)過(guò)載，則電動(dòng)機(jī)m1、m2停止。按上述工作要求：（）分配i/o通道；（）畫出梯形圖。 1、i/o點(diǎn)分配 2、梯形圖 啟動(dòng)按鈕 sb1 00000停止按鈕 sb2 00001熱保護(hù) fr1 00004輸出接觸器 km1 00200輸出接觸器 km2 00

8、201時(shí)間繼電器 tim 000李西平：到此結(jié)束。winger tuivasa-sheck, who scored two tries in the kiwis 20-18 semi-final win over england, has been passed fit after a lower-leg injury, while slater has been named at full-back but is still recovering from a knee injury aggravated against usa.both sides boast 100% records h

9、eading into the encounter but australia have not conceded a try since josh charnleys effort in their first pool match against england on the opening day.aussie winger jarryd hayne is the competitions top try scorer with nine, closely followed by tuivasa-sheck with eight.but it is recently named rugb

10、y league international federation player of the year sonny bill williams who has attracted the most interest in the tournament so far.the kiwi - with a tournament high 17 offloads - has the chance of becoming the first player to win the world cup in both rugby league and rugby union after triumphing

11、 with the all blacks in 2011.id give every award back in a heartbeat just to get across the line this weekend, said williams.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

12、 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 to speak to him first to find out what his experience was.uefa hasopened disciplinary proceedin

13、gs 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 actions.cska said they were surprised and disappointed by toures complaint. in a statement the russi

14、an 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 this mission. starting at the ground, conditions have to be very calm - winds less than 2 mph,

15、 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 will climb higher than the tip of mount everest (5.5 miles/8.85 kilometers), drifting even high

16、er 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 balloon will slowly drift to the edge of space at 120,000 feet ( then, i would assume, he will sl

17、owly step out onto something resembling an olympic diving platform.they blew it in 2008 when they got caught cold in the final and they will not make the same mistake against the kiwis in manchester.five years ago they cruised through to the final and so far history has repeated itself here - the la

18、st try they conceded was scored by englands josh charnley in the opening game of the tournament.that could be classed as a weakness, a team under-cooked - but i have been impressed by the kangaroos focus in their games since then.they have been concentrating on the sort of stuff that wins you tough, even contests - strong defence, especially on their own goal-line, completing sets and a good kick-chase. theyve been great at all the unglamorous stuff that often goes unnoticed in the