论文总字数：8357字

摘 要

PLC控制系统在现实的使用中具备很多优点，比如说，它的工作状态比较的稳定，各方面的性能也比较的优异，对于控制皮带运输机传送非常的适用。但是在实际的使用中，也出现了一些问题，为了提升它的工作稳定性以及增大皮带运输机的工作效率。本设计采用了 S7-200系列PLC来控制一组四级皮带运输机。以S7-200 CPU224模块为控制核心，通过给PLC输入的控制程序，经由CPU分析输入的控制信号，再通过S7-200模块上的通信口把CPU输出的控制信号传输给皮带运输机，达到PLC控制皮带机运动的要求，根据不同的输入控制信号，完成四组电动机的启动（M4→M3→M2→M1），然后是依次停止(M1→M2→M3→M4)，另一种方式为单独对四台电动机进行启动。对于控制电路的设计，本次采用的为热继电器，交流接触器，熔断器等元件，它们具备较好的电路保护作用，因此，对于控制系统的安全性方面有较大的提高。

关键词：PLC,皮带运输机。

ABSTRACT: The PLC control system has many advantages in the practical use, for example, its working state is relatively stable, the performance of various aspects is also relatively excellent, for the control of belt conveyor transmission is very applicable. But in the actual use, there are also some problems, in order to improve its working stability and increase the efficiency of the belt conveyor. This design uses S7-20 series PLC to control a group of four-stage belt conveyors. With S7-200 CPU224 module as the control core, through the control program input to the PLC, the input control signal is analyzed by the CPU, and then the control signal output from the CPU is transmitted to the belt conveyor through the communication port of S7-200 module, which meets the requirements of PLC controlling the belt conveyor movement. According to different input control signals, the start-up of three sets of motors (M4_M3_M2_M1) is completed, and then the control signal is transmitted to the belt conveyor. Stop in turn (M1 M2 M3 M4), the other way is to start four motors separately. For the design of control circuit, thermal relay, AC contactor, fuse and other components are used in this paper. They have better circuit protection effect, so the safety of control system has been greatly improved.

Key words: PLC, belt conveyor.

目 录

1 绪论····················································4

1．1引言···················································4

1.2课题的背景意义以及未来发展方向·························4

1.3课程设计的要求·········································4

2 PLC的概况···············································4

2.1PLC的产生与发展········································4

2.2PLC的特点··············································5

2.3PLC的组成··············································5

3皮带运输机PLC控制系统硬件电路···························5

3.1电路设计···············································5

3.2系统设计基本步骤······································10

3.3系统I/O分配··········································12

3.4PLC外部接线图·········································14

4皮带运输机PLC控制系统软件设计··························14

4.1软件设计思路··········································14

4.2程序流程图············································14

4.3系统梯形图程序设计····································17

4.4运行仿真··············································22

总结·····················································24

参考文献·················································25

致谢·····················································26

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