2017年电大《机电控制与可编程控制器技术》习题分析与详解（三）小抄参考.doc

专业好文档机电控制与可编程序控制器技术课程习题分析与详解（三）1、 进行系统配置时有那些方法？具体含义是什么？答：1）类比法，通过相同规模系统的类比，大致确定可选用的厂家产品及机型。2）估算法，估算I/O点数及模拟量路数，并确定要选用的机型。3）计算法，依完整性原则计算所需的模块数。这里可能有多个方案，那就应计算出各个方案的结果。4）计算各个方案的投入费用，并依经济性原则选其中最优者。2、 CPM1A PLC的内部继电器是怎样划分的？那些继电器有断电保护功能？答：内部继电器区分为两部分：一部分供输入点/输出点用，称为输入/输出继电器区；另一部分供PLC内部的程序使用，称为内部辅助继电器区。输入继电器区有10个通道000009，其中，000，001通道是CPU单元输入通道，002009通道用于和CPU单元连接的扩展单元的输入通道。输出继电器区有10个通道010-019，其中，010，011通道用于CPU单元输出通道，012019通道用于和CPU单元连接的扩展单元的输出通道。保持继电器具有断电保持功能，即当电源掉电时，它们能够保持掉电前的ON/OFF状态。3、 C200Ha PLC标准I/O单元在CPU机架和扩展I/O机架插槽位的通道号是如何确定的？答：C200Ha PLC标准I/O单元在CPU机架和扩展I/O机架插槽位的通道号的确定方法如下所示。机架槽1槽2槽3槽4槽5槽6槽7槽8槽9槽10CPUIR000IR001IR002IR003IR004IR005IR006IR007IR008IR009扩展机架1IR010IR011IR012IR013IR014IR015IR016IR017IR018IR019扩展机架2IR020IR021IR022IR023IR024IR025IR026IR027IR028IR029扩展机架3IR300IR301IR302IR303IR304IR305IR306IR307IR308IR3094、 C200Ha PLC 的基本组成有那几部分？答：C200Ha PLC的基本组成：一个提供系统总线和模块插槽的安装机架（母板），一个CPU单元、电源单元、若干个I/O单元或特殊I/O单元。5. 模拟量输入单元具有哪些功能？答：模拟量输入单元它可将现场设备（如传感器等）输出的多种模拟量信号转换成PLC可读的数字量形式。它接受CPU单元发来的指令和相关参数完成相应的功能，并将执行的结果和状态返回给主CPU。一旦其开关设置CPU指令和参数传送完毕，模拟量输入单元就可独立地完成A/D转换及各项规定的功能，并不需要主CPU干预。它还可以对自身运行状态和外部输入信号范围进行监视，它对外部输入信号进行连续的、周期性的循环采样和转换。CPU将模拟量输入单元的结果和状态返回均是通过相应的IR区和DM区来实现的。6. 模拟量输出单元具有哪些功能？答：模拟量输出单元将PLC的数字量转换为模拟信号输出，以驱动现场模拟装置。模拟量输出单元可以不需要主CPU干预而独立运行，按照主CPU给定的参数输出各路模拟量，并将运行状态提供给CPU。命令、参数和状态的传送也是通过相应的IR区和DM区来进行的。模拟量输出单元提供三种输出功能：输出限幅、输出极限报警和脉冲输出，这些功能必须用编程器来设置，在用户程序中不能改变这些数据。7编程时是怎样处理梯形图分支的？编程时一般应用IL（连锁）与ILC（连锁清除）指令或者是暂存继电器TR来实现梯形图的分支结构的。 8.写出图1中的梯形图的语句表。1图( a )000000000100101001000010200103001042000220000200010000200003000040100020003( 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 01000 AND NOT 00001 OUT 01000 AND 00100 OR 01001 AND NOT 00101 OUT 01001 TIM 000 #0050LD TIM000OUT 01002END9已知梯形图及00000、00001的时序图如图2所示，画出25501及01000、01001、01002、01003个元件的时序图。（其中25501为0.2s脉冲输出）。00000I00000SFT(10)255012S0.3S00001P 010R 010000012图解：时序图如下：0.3秒2秒0000000001255010100001001010020100310CMP(20)、BCMP (68)、TCMP（85）的作用分别是什么？答：CMP指令比较C1和C2两个通道中数据的大小；BCMP指令将16个范围值（上限和下限）以下限在前，上限在后的顺序存放在以CB开始的32个连续通道中，然后将数据CD与这16个范围值依次进行比较；TCMP指令将CD通道的内容与TB开始的16个连续通道的内容逐个进行比较。若相等，则在结果通道R的相应位上置1；否则，清0。"If we don't do that it will go on and go 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 FA's 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 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 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 of football."The (lack of) air up there Watch mCayman Islands-based Webb, the head of Fifa's anti-racism taskforce, is in London for the Football Association's 150th anniversary celebrations and will attend City's 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 it's about how he felt and I would like to speak to him first to find out what his experience was."Uefa has opened disciplinary proceedings against CSKA for the "racist behaviour of their fans" during City's 2-1 win.Michel Platini, president of European football's governing body, has also ordered an immediate investigation into the referee's actions.CSKA said they were "surprised and disappointed" by Toure's 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 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 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 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 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, he'll 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 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 stabilization parachute that can be deployed to slow him down. His team hopes it's 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 successfully, 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 won't. 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