PCL711B采集卡在水温控制中的应用 摘要 水温控制技术在很多工业生产设备和家用电器中广泛应用，控制算法一般采用PID控制，这是工业自动控制中常用的一种控制算法。基于PC的水温控制系统以数据采集卡作为被控量信号的反馈通道和控制量信号的输出通道，是控制器与被控对象之间的关键连接部件。 本文设计了一个基于PCL711B采集卡的水温控制系统,由下位机、上位机、和通讯网络三部分组成。下位机是基于采集卡PCL711B和温度传感器AD590的高精度数据采集系统，功能是对温度的检测与输出控制。上位机采用计算机，与下位机进行数据信息的交互，并显示各路温度值及其曲线、控制参数、设定值等。其中，温度检测单元和可控硅调功控温单元是本文的设计重点。 温度检测单元，根据设计指标的要求我们选择了温度传感器AD590，实现温度采集。 输出控制单元是通过对加热电阻丝的电源通断来实现的，采用可控硅（晶闸管）调功方式。通过MOC3041光耦过零触发器实现对功率晶闸管的过零触发，从而实现对被控对象（如炉温）的PID温度调节。采用PID算法的控制方式控制双向可控硅的导通、关断,调整功率,使之切断或接通加热器,从而控制水温稳定在预设定值上。 关键词： PCL711B采集卡；温度传感AD590；PID温度调节；可控硅调功 ABSTRACT Temperature co
ntrol tech
nology iswidely used to co
ntrol i
n ma
ny i
ndustrial productio
n equipme
nt a
nd household applia
nces. Ge
nerally, the PID co
ntrol algorithm is commo
nly used i
n i
ndustrial automatic co
ntrol. The data acquisitio
n card is used for Temperature co
ntrol system based o
n PC as a cha
n
nel. The cha
n
nels i
nclude the feedback cha
n
nel for the sig
nal of co
ntrolevolume a
nd the output cha
n
nel for the sig
nal of co
ntroledvolume. The data acquisitio
n card is the key compo
ne
nts co
n
nectio
ns the co
ntrollerwith the target co
ntroled. The paper mai
n desig
ns a brai
npower co
ntrolli
ng system ofwater temperature based o
n the Acquisitio
n Card AD590. It co
nsists of up a machi
ne, bottom a machi
ne, a
nd commu
nicatio
n
network. Bottom a machi
ne is a high accuracy data collectio
n system that bases o
n the Acquisitio
n Card PCL711B a
nd the temperature se
nsor AD590 system. Its fu
nctio
n is to temperature a
nd output the co
ntrol. The up a machi
ne is a PC.with the bottom a machi
ne proceedi
ng data i
nformatio
n ha
nds overwith each other, combi
ne each road of ma
nifestatio
n temperaturevalue a
nd its curve, co
ntrol parameter, i
nitialvalue...etc. Amo
ng them, the u
nits of the temperature exami
natio
n a
nd the regulati
ng power of the ca
n-co
ntrolled silico
n are the poi
nts of this desig
n. For the temperature exami
natio
n u
nit, co
nsider of the i
ndex request of the desig
n,we choosi
ng the the temperature se
nsor AD590 to realize temperature collectio
n. The output co
ntrolled u
nit is achieved by tur
n-o
n a
nd tur
n-off of the power supply of the heated resista
ncewire, a
nd adopt the regulati
ng power of the ca
n-co
ntrolled silico
n.via photoelectricity coupli
ng by-zero trigger MOC3041, it ca
n actualize by-zero touch-off to power thyristor, thereby actualize the PID thermoregulatio
n of the u
nder co
ntroller(such as the temperature camp stove). The PID co
ntrol algorithm is used to co
ntrol of two-way thyristor co
nductio
n, tur
n-off, adjusti
ng the power, cut off or co
n
nected to the heater to co
ntrol thewater temperature has stabilized at pre-setvalue. Key Words: the Acquisitio
n Cardr; PCL711B; the temperature se
nsor AD590; the PID thermoregulatio
n；the regulati
ng power of the ca
n-co
ntrolled silico 目录 引言1 1绪论2 1.1课题研究背景和意义2 1.1.1数据采集2 1.1.2基于PC的控制系统5 1.1.3温度控制系统的发展5 1.2本课题的研究内容和要求6 2系统方案设计8 3硬件设计9 3.1检测电路设计9 3.2控制电路设计11 3.3系统电源设计14 3.4总体电路设计15 4 PCL711B采集卡介绍17 4.1简介17 4.1.1规格17 4.1.2一般特性18 4.2 PCL711B参数设置18 4.2.1 I/O端口设置18 4.2.2 I/O地址选择19 4.3 D/A范围选择19 4.4连接针头的分配20 5软件设计22 5.1程序设计22 5.1.1温度控制程序设计22 5.1.2界面设计25 5.1.3PID运算程序设计27 5.2 PID程序调试： 29 5.2.1参数选择方法29 5.2.2采样周期的选择31 6水温电热装置分析33 7结论35 谢辞36 参考文献37