基于西门子S7-200的液体混料罐控制系统设计

扬州职业大学

毕业论文（设计）

论文分类号： 密 级：无

基于PLC的液体混料罐控制系统设计

系 别： 汽车与电气工程系 专 业： 电气自动化 班 级： 08电气（1）班 姓 名： 姜飞龙 学 号： 0802030113 指导教师： 张疆涌 完成时间： 2011年5月

年 月 日

目录

摘 要 ................................................................................................................... III 前 言 ................................................................................................................... 1 第1章 混料罐控制系统方案设计 ..................................................................... 3

1.1 方案设计原则 ......................................................................................... 3 1.2 系统的总体设计要求 ............................................................................. 3 1.3 总体结构设计方案 ................................................................................. 4 1.4 控制对象分析 ......................................................................................... 4 第2章 混料罐控制系统的硬件设计 ................................................................. 6

2.1 选择PLC ................................................................................................. 6 2.2 选择接触器 ............................................................................................. 7

2.2.1 用途 ............................................................................................... 8 2.2.2 工作条件 ....................................................................................... 8 2.2.3 结构特征 ....................................................................................... 8 2.3 选择搅拌电机 ......................................................................................... 9

2.3.1 功率选择 ....................................................................................... 9 2.3.2 种类和型式的选择 ..................................................................... 10 2.3.3 电压和转速的选择 ..................................................................... 10 2.4 小型三极断路器的选择 ....................................................................... 10 2.5 液位传感器的选择 ............................................................................... 11 2.6 选择电磁阀 ........................................................................................... 12

2.6.1 入罐液体的选用 ......................................................................... 12 2.6.2 出罐液体的选用 ......................................................................... 13 2.7 选择热继电器 ....................................................................................... 13 2.8 PLC I/O点分配 .................................................................................. 14

2.8.2 PLC的I/O接线图 ...................................................................... 15 2.9 主电路的设计 ....................................................................................... 16 第3章 混料罐控制系统的程序设计 ............................................................... 18

3.1 分析控制要求 ....................................................................................... 18 3.4 梯形图执行原理分析 ........................................................................... 21

3.4.1 混合液体装置控制系统主程序梯形图 ..................................... 21 3.4.2 自动混料装置控制系统自动运行子程序梯形图 ..................... 23 3.4.3自动混料装置控制系统复位子程序梯形图 .............................. 26

第4章 系统常见故障分析及维护 ................................................................... 27

4.1 系统常见故障分析及维护 ................................................................... 27 4.2 系统故障分析及处理 ........................................................................... 28

4.2.1 PLC主机系统故障分析及处理 .................................................. 28 4.2.2 PLC的I/O端口系统故障分析及处理 ...................................... 28 4.2.3 现场控制设备故障分析及处理 ................................................. 28

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4.3 系统抗干扰性的分析和维护 ............................................................... 29 结 论 ................................................................................................................... 30 谢 辞 ................................................................................................................... 31 参考文献 ............................................................................................................. 31

II

基于S7-200的液体混料罐控制系统设计

摘 要

随着科技的发展，PLC的开发与应用把各国的工业推向自动化、智能化。强大的抗干扰能力使它在工业方面取代了微型计算机，方便的软件编程使他代替了继电器的繁杂连线，灵活、方便，效率高。

本次设计主要是对两种液体混合搅拌机PLC控制系统的设计，在设计中针对控制对象：三只传感器监视容器高、中、低液位，设三电磁阀控制液体A、B输入与混合液体C输出，设搅拌电机M。搅拌机是一种将两种或多种以上材料搅拌混合的系统，对搅拌机的控制，关系到产品的质量，工艺流程是：启动后开阀放出混合液体C，低液位后延时20S 放空后关阀，放入液体A经低液位再注入至中液位，关A，放液体B至高液位，关B，启动搅拌电机M，搅60S后停，开阀放出混合液体C，低液位后延时20S 放空后关阀，又重复上述过程，要求工作过程中按下停止按纽后搅拌器不立即停止工作，对当前混合操作处理完毕后才停止搅拌器。本设计采用德国西门子S7系列S7-200PLC以液体混料控制系统为中心，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。

关键词：液体混料装置，自动控制，PLC，电动机，传感器

III

LIQUID MIXING TANK S7-200 BASED CONTROL SYSTE

DESIGN

ABSTRACT

With the development of technology, PLC development and application of the industrial countries into the automation and intelligence.Strong anti-interference ability to make it in the industry replaced the micro-computer to facilitate software programming to enable him to replace the relay of complex connections, flexible, convenient and efficient.

The system is mainly of two liquids mixing and blending machine PLC control system, for controlling the object in the design: three sensors Jianshirongqi high, medium and low level, She three solenoid control liquid A, B input and the mixed liquid C output, set stirring motor M. Mixer is a two or more above the mixing material system, on the mixer control, related to the quality of the product, process is: A post placed in the liquid to be injected by the low level of liquid level, the relevant .A up to high level of liquid B, Guan B, start stirring motor M, after mixing 60S stop, open mixed liquid release valve C, the low level off after the delay after 20S emptying valve, then repeat the process, the course work required.Press the Stop button to stop working immediately after the mixer is not on the current operations have been disposed of to stop mixing blender. This design uses the Japanese Mitsubishi company to liquid mixture FX1N series PLC control system for the center, from the control system hardware system components, software used to the system design process (including design, design process, design requirements, ladder design, external Connect Communications, etc.), aims to design and manufacturing process which presents a brief introduction and explanation.

KEY WORDS: liquid mixing equipment, automatic control, PLC, motor, sensor

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