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可编程控制器应用课程综合练习题

可编程控制器应用课程综合练习题
可编程控制器应用课程综合练习题

可编程控制器应用课程综合练习题

一、填空题

1、PLC的输入和输出量有和两种。

2、PLC可以代替继电器进行与控制。

3、PLC重复执行输入采样阶段、和输出刷新阶段三个阶段,每重复一次的时间称为一个。

4、把可编程序控制器系统和系统各自的优势结合起来,可形成一种新型的分布式计算机控制系统。

5、用户程序是由若干条顺序排列的构成。

6、定时时间等于和的乘积。

7、若加计数器的计数输入电路(CU)由断开变为接通,同时复位输入电路(R),计数器的当前值加1。当前值大于等于设定

值(PV)时,其常开触点,常闭触点。

8、若加计数器的计数输入电路(CU)复位输入电路,计数器被复位,复位后其常开触点,常闭触点,当前

值为0。(注:填写“接通”或“断开”)

9、通电延时定时器(TON)的输入(IN)电路时开始定时,当前值大于等于设定值时,其定时器位变为1状态,其常开触点,

常闭触点。(注:填写“接通”或“断开”)

10、通电延时定时器(TON)的输入(IN)电路时被复位,复位后其常开触点,常闭触点,当前值等于0。

(注:填写“接通”或“断开”)

二、判断题(注:正确的打√,错误的打×)

1、PLC的输入和输出量有开关量和模拟量两种。开关量I/O用最大I/O通道数表示,模拟量I/O点数用最大I/O点数表示。()

2、可编程序控制器程序的梯形图语言相比其它几种编程语言,形象直观,程序的输入和修改方便,功能最强。()

3、电气隔离是在微处理器与I/O回路之间采用的防干扰措施。()

4、可编程序控制器程序的梯形图和功能块图都可以转换为语句表。()

5、可编程序控制器程序的语句表一定可以转换为梯形图和功能块图。()

6、可编程序控制器程序的梯形图和功能块图之间是一一对应。()

7、在S7-300中,定时器区为512Byte,最多允许使用256个定时器。()

8、S7提供各种不同的组织块,这些组织块分有优先级,允许较低优先级的组织块中断较高优先级的组织块。()

9、PLC具有模数转换和数模转换功能,完成对模拟量的控制与调节。()

10、在可编程序控制器中,节点在程序中可不受限制地使用。()

三、简答题

1、集散控制系统和可编程控制系统有何区别?

2、工业控制计算机和可编程控制系统有何区别?

3、在PLC控制系统设计中最为重要的原则是什么?

四、改错

找出下列梯形图中的错误,并改正。

五、根据梯形图写出梯形图指令

六、设计题

1、一台三相异步电动机正反转控制的电路如下图(a)所示;PLC控制的接线如图(b)所示。当按下正向启动按钮SB1,电动机正转;当按下反向启动按钮SB2,电动机反转;停机时按下停机按钮SB3。过载是热继电器FR动作,电动机停止。按照上述工作要求:(1)分配I/O 通道;(2)选择plc,画出梯形图。

图(a)电动机正反转控制电路图(b)PLC控制接线图

2、两台电动机的关联控制:在某机械装置上装有两台电动机。当按下正向起动按钮SB2,电动机一正转;当按下反向起动按钮SB3,电动机一反转;只有当电动机一运行时,并按下起动按钮SB4,电动机二才能运行,电动机二为单向运行;两台电动机有同一个按钮SB1控制停止。按照上述工作要求:(1)分配I/O通道;(2)选择plc,画出梯形图。

答案

一、填空题

1、开关量模拟量;

2、组合逻辑顺序逻辑;

3、程序执行阶段扫描周期;

4、集散控制(DCS);

5、指令;

6、时基定时值;

7、断开接通断开;

8、接通断开接通;

9、接通接通断开; 10、断开断开接通

二、判断题

1、(×)

2、(×)

3、(√)

4、(√)

5、(×)

6、(×)

7、(√)

8、(×)

9、(√) 10、(√)

三、简答题

1、集散控制系统和可编程控制系统有何区别?

答:集散控制系统在模拟量处理和回路调节方面具有优势,主要侧重于回路调节功能;可编程控制系统在数字处理和顺序控制方面具有优势,主要侧重于开关量顺序控制。

2、工业控制计算机和可编程控制系统有何区别?

答:工业控制计算机适用于要求快速、实时性强、模型复杂、计算工作量大的工业对象的控制;可编程控制系统具有很高的可靠性和抗干扰性。

3、在PLC控制系统设计中最为重要的原则是什么?

答:在PLC控制系统设计中最为重要的原则是满足控制对象的控制要求、确保控制系统的安全可靠性、简化系统结构。

四、改错

1、(注:PT前加上的数据可为0~32767的任意自然数。)

2、

(注:(1)计数器C8的设定值可为0~32767的任意自然数;(2)不能重复使用同一个计数器的线圈编号,将其中一个C8改为C0~C255之间的任意其他线圈。)

五、根据梯形图写出梯形图指令

LD I0.3

A C20

ON I0.1

A I0.2

= Q2.1

LDN I0.1

A C20

O I0.3

AN I0.4

= Q2.2

六、设计题

1、(1) 表电动机正反转控制电路I/O分配表

(2) 选西门子S7-200的plc(也可以选其它型号plc)

图1 电动机正反转控制电路的PLC控制程序

2、(1

(2)选西门子S7-200的plc(也可以选其它型号plc)

图2 电动机关联控制的PLC控制程序

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