电大机电控制与可编程序控制器技术期末复习指导(文本)小抄参考

1、专业好文档机电控制与可编程序控制器技术期末复习指导（文本）李：同学们好！本次课围绕机电控制与可编程序控制器复习重点的讨论展开。我先将本课程复习重点一一点出，然后解答同学们的问题。赵：通常说的plc的点数，也就是说几点的plc，就是指输入点和输出点的和吗？李：正确。赵：宝鸡电大10春机械设计赵卫哲求教李：子程序出于局部控制需要。赵：可编程 控制器的应用有哪些？李：工业控制系统。赵：临近考试了，老师可否框定一下考试的范围。李：第1、2、3、5、7、8章。赵： plc是如何与伺服电机联系的李：接口通过驱动电路连接。顾：在绘制梯形图的时候，如何把握各种指令的运用规则李：指令的运用建立在对指令的充分理解

2、上。党：电气控制线路的设计需要注意什么？李：循序设计规律。尹：可编程控制器有实习课程吗？李：有实习及课程设计。薛：电器控制系统中常用的手动电器有刀开关、组合开关、按钮等。李：请参看低压电器部分。陈：如何学好机电控制这门课？大家交流一下，共同进步！李：理论联系实际。闵： plc编程，欧姆龙公司产品与三菱公司的产品编程有区别吗？我见到很多地方用的是三菱的李：基本指令大致相同，符号不同。编程方法相同。陈：就要考试了，请问大家都是怎么复习的呀，有没有重点方面的呢？和大家分享一下，共同进步。马：只是书和往年试卷李：复习形成性考核作业，考题大多来自于其中。陈： plc基本硬件由那几部分组成？各部分的主要作

3、用是什么？李：请参看相关章节。孙：基准的定义是什么李：从字意上解释基本准则。孙：咱们国家有自己的plc专利吗？李：有，上海等厂家生产相关产品。 机电控制与可编程序控制器复习重点复习重点章节：第一、二、三、四、七、八章第一章 常用低压控制电器手动电器：刀开关、组合开关、按钮自动电器：接触器，继电器（电磁式继电器、热继电器、时间继电器），行程开关，熔断器执行电器：电磁铁等要求：掌握上述电器的功能、符号、应用场所考核题型：（填空、问答）填空举例：接触器的触点分为 和 。 用来通断大电流的主电路， 用来通断小电流的控制电路问答举例：在电动机的控制线路中，热继电器的作用是什么？可否用熔断器和过电流继电器

4、代替？为什么？第二章 电器控制基础控制线路的常用基本回路点动、联锁式互锁、多点、顺序、循环鼠笼式异步电机起动控制线路全压直接、降压异步电机正反转控制线路要求：掌握上述控制线路的工作过程考核题型：问答、读图分析问答题举例：在三相异步电机控制线路中，常 采用的起动方法有哪几种？读图分析举例：第三章 电器控制系统的设计基础设计方法：、经验设计方法、逻辑设计方法设计步骤：设计规律： 考核题型：（问答）问答举例：在交流控制回路中，两个同时动作的继电器线圈可以串联连接吗？为什么？第四章 可编程序控制器概述掌握：plc的基本概念、硬件结构、基本工作原理、性能指标基本概念： plc与继电器控制线路比较相同处：

5、输入设备、输出设备不同处：控制部分（环节）硬件结构：中央处理单元（cpu）、存储器单元、输入/输出接口单元基本工作原理：循环扫描过程性能指标：熟悉：plc分类以结构形式分类 以控制规模分类 考核题型：问答（见形成性考核作业）第七章 可编程序控制器的编程语言掌握梯形图编程的格式、特点、规则、梯形图的画法掌握基本指令、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考核题型：问答、梯形图改错、根据梯形图写指令问答例 ：编程时怎样实现梯形图分支的？

6、梯形图改错（一般规则）a.触点在线圈左侧b.左边母线不能与线圈直接相连c.输出线圈不能串联d.tc区不能重复使用梯形图改错例根据梯形图写指令ld not 00005and 00006ld 00002and 00004or ldand 00001and not 00003ld 00008and not 00009or ldand 00007out 00100end第八章 可编程序控制器系统设计及应用举例掌握梯形图的基本电路启动停电路双向控制电路单按钮启停控制电路定时器和计数器的应用控制电路（6个） 掌握梯形图经验设计方法：参照典型电路（基本电路），进行修改和完善，针对逻辑关系较简单的控制电路。掌

7、握梯形图的顺序控制设计方法。考核题型：分析程序功能、设计题1、分析程序功能：梯形图程序如图所示，分析00000、00001对01000、01001的控制作用。 2、由两台三相交流电动机m1、m2组成的控制系统的主回路和plc控制电路如图所示。按起动按钮sb1，m1电动机起动，过5秒后m2电动机起动，按停止按钮sb2电动机m1、m2停止；若m1电动机过载，则电动机m1、m2停止。按上述工作要求：（）分配i/o通道；（）画出梯形图。 1、i/o点分配 2、梯形图 启动按钮 sb1 00000停止按钮 sb2 00001热保护 fr1 00004输出接触器 km1 00200输出接触器 km2 00

8、201时间继电器 tim 000李西平：到此结束。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