基于PLC的搅拌器控制系统设计

1、基于PLC的搅拌器限制系统设计摘要随着PLC等许多处理器的开展,自动限制模式的电动机的数量越来越多. 传统的 限制方式因技术手段落后、生产效率低等弊端已不能适应企业生产的需要.本文主要 介绍采用西门子PLC实现对液体搅拌系统进行自动限制.基于PLC构成的用于两种液 体自动混合、自动搅拌和自动放料系统的限制目标、 硬件组成、软件设计及系统功能, 能模拟显示液体搅拌系统的全部工作过程.系统硬件主要由S7-300可编程限制器、电磁阀、泵以及液位变送器等组成,编 程软件采用采用西门子编程软件 STEP7系统通过液位变送器将采集到的现场液位高 度传送给西门子PLC并由PLC对现场数据逻辑处理后,发出相应

2、的限制指令,完成 系统的自动限制.最后,系统使用 RS-232接口与上位机相连实现PLC与计算机的通 讯.系统不仅自动化程度高,灵活性强,还具有在线修改功能,可满足不同的生产工 艺要求.关键字：PLC液体搅拌系统,液位变送器,电磁阀DESIGN OF INDUSTRIAL MIXING PROCESS CONTROLSYSTEM BASED ON PLCABSTRACTWith the development of PLC, there are more and more automatic control electromotor. The traditional way of contro

3、lling can not meet the needs of enterprise production for its in low efficiency and low productivity. This paper introduces the rational application of SIEMENS PLC in the automatic control system of liquid mixer. PLC-based liquid composition for the two auto-mixing, automatic mixing and automatic di

4、scharge system, control objectives, hardware components, software design and system capabilities of liquid mixing system simulation show that all the work process.The System hardware is mainly formed by the S7-300 programmable logic controller, electromagnetic valve, pump and liquid location sensor,

5、 programming software using Siemens STEP7. The System through the liquid location sensor collected level information to Siemens PLC and then the PLC deal with on-site data, and sending corresponding control command to complete the system of automatic control. At last system is realized the communica

6、tion between PLC and the upper computer by using the connection of RS-232.This system not only has high automation level and great mobility but also can alter the parameter on line, it can use in kinds of liquid location control systems.Key words: PLC, liquid mixing system , liquid location sensor,

7、electromagnetic valve目录1 .绪论11.1 液体搅拌系统的简介11.2 液体搅拌系统组成21.3 PLC在液体搅拌系统中的应用 22 .可编程限制器42.1 可编程限制器的开展42.1.1 PLC技术开展概况 52.1.2 可编程限制器在我国的开展62.2 PLC的分类72.3 PLC的工作原理82.4 可编程限制器实现限制的要点 102.4.1 可编程限制器根本特点112.5 PLC的主要技术指标及抗干扰分析 132.5.1 干扰源及干扰一般分类 142.5.2 PLC限制系统中电磁干扰的主要来源 142.5.3 PLC限制系统工程应用的抗干扰设计 172.5.4 主要抗干扰举措172.6 西门子S7-300可编程限制器简述 182.7 SIMATIC S7-300系列PLC系统根本构成 182.7.1 SIMATIC S7-300 的组成 192.7.2 S7-300的扩展水平202.7.3 S7-300模块地址确实定 2