摘 要

目前, 由于原材料缺乏, 纸价暴涨, 使得许多以人工为主生产纸浆的造纸厂濒于倒闭。此时许多厂家开始在困境中进行技术革新和改造寻找出路。

传统的蒸煮过程是依靠人工控制升压曲线。人工操作又由于受操作工人熟练程度和责任心等因素影响很大,往往使实际的升压曲线与工艺要求相差很大, 造成用汽量增大, 得浆率降低, 严重的时候还会造成总管汽压的下降, 影响造纸设备的稳定运行。 不仅造成不必要的浪费, 而且如果纸浆夹生将直接影响洗、筛、漂等工序，给质量监督带来很大难度。

本文介绍的是一个由西门子S7-200PLC控制的无线温度控制系统，它利用S7-200PLC和无线温度传感器及组态王等其他器件实现。温度测量部分工作原理是S7-200PLC利用无线温度传感器对温度进行采集，然后进行无线发送，接收端收到信号后，进行解码，之后实现温度显示。温度控制部分工作原理是PLC将温度控制信号经无线收发电路发射出去，接受端收到信号经CPU处理控制蒸球加热的开启达到欲设定的要求。因此基于无线的的PLC控制蒸球温度，能对造纸厂蒸球制浆过程中的球内温度进行有效的实时控制,使之按照一定的温度工艺曲线变化,缩短蒸煮时间,节约了蒸汽能源,提高了纸浆得率和质量,不就可以大量降低工人劳动强度,还可以实现了慢升温快速蒸煮的工艺要求,能获得显著的经济效益,具有一定的推广价值。

关键词：蒸球；S7-200；无线控温；组态王

The design of the steam ball control system based on wireless

ABSTRACT

At present, as the lack of raw materials, the price of paper has being rose, makes a lot of manual production of pulp mill on the brink of collapse. At this time many manufacturers began to carry out technological innovation and transformation in the plight of the search for way out.

The controlled of the boost curve the traditional cooking process is by artificial . Manual operation and due to the operation of skilled workers degree, responsibility and other factors influence tends to make the actual boost curve and process requirements vary greatly, cause to increase the amount of steam, to reduce the rate of slurry and serious when can cause duct pressure drop and paper-making equipment and stable operation. Not only cause unnecessary waste and if the pulp cooked will directly affect the washing, screening and bleaching processes, quality supervision to bring great difficulty.

A controlled by Siemens S7-200 PLC wireless temperature control system is introduced in this paper. It uses S7-200 PLC and wireless temperature sensor and Kingview and other devices. The working principle of temperature measurement is the S7-200 PLC using wireless temperature sensor to collect temperature, and wireless transmission, the receiver receives the signal and decode it. After realizing temperature display. Temperature control part of the working principle is PLC temperature control signal by the wireless transceiver circuit sent out, receive the signal received by the CPU processing control of the ball heating of the open up to set the requirements.So using PLC based the wireless to control the steam temperature of cooking ball, can real-timed control the ball temperature during the process of the steam ball pulping of a paper mill. To change according to a certain temperature process curve.and shorten the cooking time, save steam energy, improve the pulp yield and quality, Not only reduce a large amount of workers’ intensity,but also can realize the requirements, of slow heating quick steaming process, and can obtain obvious economic benefit.It has large promotion value.

Key words：Steamed ball； S7-200；Wireless temperature control ；Kingview

目 录

1 引言………………………………………………………………………………………1

1.1 蒸球控制系统的意义…………………………………………………………… …………………1

1.2蒸球控制系统国、内外概况…………………………………………………………………1

2 控制系统的硬件设计………………………………………………………………………………4

2.1 元器件的选用……………………………………………………………………………………4

2.1.1 S7-200 PLC…………………………………………………………………………………4

2.1.2 传感器……………………………………………………………………………………7

2.1.3 模拟量拓展模块……………………………………………………………………10

2.1.4 上、下位机…………………………………………………………………………………11

2.1.5 编程软件STEP7--Micro/WIN 概述 ………………………………………………11

2.1.6 组态软件………………………………………………………………………………14

2.1.7 整体设计方案……………………………………………………………………………15

2.2 I/O分配图………………………………………………………………………………………16

2.3 硬件接线图………………………………………………………………………………………17

3 控制系统的软件设计………………………………………………………………………………18

3.1 流程图……………………………………………………………………………………………18

3.2 内存地址分配…………………………………………………………………………19

3.3 S7-200梯形图………………………………………………………………………………19

3.3.1 主程序……………………………………………………………………………………19

3.3.2 子程序……………………………………………………………………………………22

4 组态画面的设计………………………………………………………………………………27

4.1 组态项目的建立…………………………………………………………………………………27

4.1.1 新建画面………………………………………………………………………………28

4.1.2 新建设备………………………………………………………………………………28

4.1.3 组态与PLC通信测试……………………………………………………………………30

4.2 创建组态画面…………………………………………………………………………31

4.2.1 新建主画面………………………………………………………………………………31

4.2.2 组态变量的关系…………………………………………………………………………32

4.2.3 组态与PLC通信测试……………………………………………………………………36

4.2.4 报表的打印……………………………………………………………………………36

结论 ………………………………………………………………………………………………………37