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毕业设计 搅拌器的PLC电气控制设计 共36页，17518字
摘要：论文主要介绍了毕业设计的制作过程和应用的技术以及所用芯片的特点、怎样实现设计的要求等。设计的内容是搅拌器的PLC电气控制设计。搅拌器无论是在现代工业还是农业的发展上都起着非常重要的作用，特别是液体搅拌器，PLC具有可靠性高、功能完善、编程简单等特点，自从人们把PLC和搅拌器联系起来以后，搅拌器能自动完成两种或多种液体按一定比例的混合搅拌，从进料到出料都不需要人的参与，从而减少了人的劳动量，特别是在一些有毒液体的混合中，就更是减小了人员中毒的可能性，所以PLC控制的液体搅拌器的应用前景是十分广泛的。
论文还详细介绍了西门子公司S7-200系列PLC的组成和技术指标，以及它的输入、输出接口的功能和分类，论文设计是基于西门子公司的S7-200系列PLC控制液体搅拌器的运行。文中分析了其工艺过程，在明确了其控制要求以后对其进行了硬件及软件的设计，并详细介绍了其控制方案，根据设计的要求和特点，确定PLC的输入、输出分配，并详细分析了其控制过程、工艺流程图、梯形图。

关键词：PLC；搅拌器；S7-200；控制过程
The PLC Electric Mixer Control Design
Abstract：The paper mainly introduced the graduation project manufacture process and the application technology as well as does use the chip the characteristic, how to realize the design request and so on.The design content is the mixer PLC electricity control design.Mixer regardless of is all is playing in the modern industry perhaps in the agricultural development the extremely vital role, specially liquid mixer.PLC has the reliability high, the function consummates, the programming simply and so on the characteristics since the people PLC relates with the mixer after, the mixer can automatically complete two kind of or many kinds of liquids according to certain proportion mix agitation, from feeds to leaves the material all not to need human’s participation, thus reduced human’s labor, specially in some virulent liquid mix, reduced the possibility which the personnel is poisoned, therefore the PLC control liquid mixer application prospect is extremely widespread.
The paper also in detail introduced Siemens S7-200 the series PLC composition and the technical specification, as well as its input, the output connection function and the classification, the paper design was control liquid mixer transports in the issue document based on Siemens’s S7-200 the series PLC to analyze its technological process, will be being clear about its control request later to carry on the hardware and the software design to it, and introduced in detail its control plan, according to the design request and the characteristic, determined PLC the input, the output assignment, and multianalysis its controlled process, flow chart, trapezoidal chart.
Key words：PLC;Mixer;S7-200;Controlled process
目 录
摘要 I
Abstract. II
引言 1
第一章 PLC控制系统的设计原则 2
1.1 PLC控制系统软件设计 2
1.1.1 控制系统设计的基本步骤 2
1.1.2 PLC软件系统设计的方法 3
1.2 PLC硬件系统设计 4
1.2.1 PLC的基本性能指标 5
1.2.2 PLC的选型 5
第二章 液体搅拌器的PLC电气控制设计 8
2.1 控制要求 8
2.2 系统的抗干扰 8
2.2.1 制定系统的抗干扰措施 8
2.2.2 影响PLC控制系统稳定的干扰因素 9
2.2.3 PLC控制系统抗干扰的方法和措施 9
2.3 系统设计 10
2.3.1 统计输入、输出点并选择PLC型号 10
2.3.2 分配PLC的输入/输出端子 15
2.3.3 程序设计 16
2.3.4 PLC的外部接线图 16
2.3.5 系统的梯形图 18
2.3.6 上机调试 20
第三章 PLC的基本指令及程序设计 21
3.1 PLC概述 21
3.1.1 PLC的定义及工作原理 21
3.1.2 S7-200系列PLC类型及功用 21
3.2 S7-200 PLC的基本指令 23
3.2.1 逻辑指令 23
3.2.2 定时器（T）和移位寄存器指令 25
结论 30
致谢 31
参考文献 32