PLC在液体混合装置控制中的应用.doc

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1、摘要随着科学技术的发展，人们的生活日趋自动化，生产技术更是如此。PLC作为计算机家族中的一员，是为工业控制应用而设计的。随着微处理器、计算机和通信技术的飞速发展，可编程序控制器PLC在工业控制中的地方也日益提升并且在工业控制得到广泛应用，而且可编程序控制器在工业中所占比重迅速的上升。本次设计是利用PLC在实现两种液体的自动混合。此次设计的主要考虑其各个不同状态动作的连续和关联，对不同的状态进行不同的动作输出，从而实现将AB两种液体混合的周期性控制（包括单周期）。本次设计主要意义是：用PLC编程来控制，乙方面可以省去人力和物力

2、，从而达到节省成本的目的；另外程序的合理性，全面性和可靠性可以使液体混合更安全可靠全面实现。关键词：PLC液体混合装置自动控制目录摘要····························································································第1章引言····················································································01.1课程设计的目的······

3、·································································0第2章液体混合装置系统设计·······················································02.1系统的整体设计要求································································0第3章硬件电路设计············································

4、·························03.1总体结构················································································03.2PLC选型及I/O分配图······························································13.3设计所需设备································································

5、··········1第4章系统PLC软件设计····························································14.1PLC控制相关流程图·································································14.2可编程控制梯形图····································································34.3系统调试···············

6、·································································5第5章总结····················································································7第1章引言1.1课程设计的目的PLC技术是现代工业自动化三大支柱之一，作为一个电气工作者，必须掌握好这门技术。综合课程设计（PLC部分）的目的是使学生从应用角度出发，掌握PLC的基本结构和原理以及典型PLC的指令系统和

7、编程方法，学会PLC控制系统的设计方法及PLC使用方法，通过设计环节以提高学生的实践应用能力及分析、解决问题的能力，为今后工作奠定良好的基础。第2章液体混合装置系统设计物料的混合操作是一些工厂关键的或不可缺少的一环。对物料混合装置的要求是设备对物料的混合质量高、生产效率和自动化程度高、适应范围广、抗恶劣工作环境等。采用PLC对物料混合装置进行控制恰恰能满足这些要求，因此多种物料混合的PLC控制具有广泛的应用。多种液体按一定比例的混合是物料混合的一种典型形式。本次课程设计以两种液体的混合装置为例进行液体混合装置PLC控制系统设

8、计。2.1系统的整体设计要求混合装置的工作要求：（1）按下启动按钮SB1，装置投入运行，液体A阀门通电打开，液体A流入容器。（2）当液面到达SL2时，液位传感器SL2接通，关闭液体A阀门，打开液体B阀门。（3）液面到达SL1时，关闭液体B阀门，搅动电机开始搅动。（4）搅动电机工作6秒后停止