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基于PLC的多种液体混合控制系统设计
摘 要
以三种液体的混合灌装控制为例，将三种液体按一定比例混合，在电动机搅拌后要达到控制要求才能将混合的液体输出容器，并形成循环状态。液体混合系统的控制设计考虑到其动作的连续性以及各个被控设备动作之间的相互关联性，针对不同的工作状态，进行相应的动作控制输出，从而实现液体混合系统从第一种液体加入到混合完成输出的这样一个周期控制工作的程序实现。设计以液体混合控制系统为中心，从控制系统的硬件系统组成、软件选用到系统的设计过程（包括设计方案、设计流程、设计要求、梯形图设计、外部连接通信等），旨在对其中的设计及制作过程做简单的介绍和说明。设计采用西门子公司的S7系列去实现设计要求。
关键词：多种液体，混合装置，自动控制
I
Based on a number of the plc a control system design
ABSTRACT
Mixture of three kinds of liquid filling control, for example, the three kinds of liquid by mixing, after mixing in the motor control requirements in order to achieve the mixed liquid output container, and form loop. Liquid Hybrid control system design taking into account the continuity of its movements and actions of various charged Shebei correlation between, for different working conditions, with corresponding motor control output in order to achieve liquid mixing system from a liquid by adding to the mix to complete the output of such a cycle control for program implementation. Liquid for the center,From the control system process (including design, design process, design requirements, ladder design, external connections and communications), seeks to design and manufacturing process which presents a brief introduction and Note. Design in siemens china's s7 series of to achieve the design demands.
KEY WORDS: Multi-fluid, Hybrid devices, Automatic control
II 目 录
前 言 ................................................................................................ 1 第1章 多种液体混合灌装机控制系统设计 .................................... 3
1.1 方案设计............................................................................... 3 1.2 方案的介绍 ........................................................................... 3 第2章 硬件电路设计 ....................................................................... 5
2.1 总体结构............................................................................... 5 2.2 液位传感器的选择 ............................................................... 6 2.3 搅拌电机的选择 ................................................................... 6 2.4 电磁阀的选择 ....................................................................... 7 2.5 接触器的选择 ....................................................................... 8 2.6 热继电器的选择 ................................................................... 8 2.7 PLC的选择 ........................................................................... 8 2.8 PLC输入、输出口分配 .................................................... 10 2.9
液体混合装置输入输出接线........................................... 10
第3章 软件电路设计 ..................................................................... 13
3.1程序框图 ............................................................................. 13 3.2 根据控制要求和IO地址编制的控制梯形图 ................... 13 第4章 系统常见故障分析及维护 ................................................. 17
4.1系统故障的概念 .................................................................. 17 4.2 系统故障分析及处理 ......................................................... 17 4.3 系统抗干扰性的分析和维护 ............................................. 18 结 论 .............................................................................................. 20 谢 辞 ................................................................................................ 21 参考文献 .......................................................................................... 22
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