5X00226G02
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公司名:厦门莫格电气自动化有限公司
联系人:雷琳
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控制系统基本原理控制策略摘 要:介绍TMP01可编程温度控制器的工作原理及控制点的设置方法,分析了TMP01在温控和传输中的典型应用电路。项目的实施简介汽车转向泵是一种中汽车的零部件,它由多种零件组成,需要借助不同的设备,按照一定的工序把它们组装起来。在整个过程中,不仅要完成基本的装配,还要对过程中诸如压力、位移、时间等参数进行实时监控,以满足工艺所提出的严格要求,保证装配质量。汽车转向泵自动装配线就是完成上述功能的一组设备,它是由多个工位组成的一条流水生产线,每个工位分别由1台可编程控制器控制,以实现不同的功能。0引言锅炉作为热电站的主要设备,要求安全长周期运行,其中结垢是影响寿命的主要因素,对水的要求比较高。锅炉用水是将水在一定的温度和压力下加热产生蒸汽,用蒸汽作为传热和动力的介质,对于低压和中压锅炉,这种锅炉对水质要求稍低;而高压锅炉对水质要求非常高。凡能导致锅炉、给水系统及其它热力设备腐蚀、结垢及引起汽水共腾现象,使离子交换树脂中毒的杂质如溶解氧、可溶性二氧化硅、铁以及余氯等都应大部分或全部出往。在锅炉水处理中,锅炉补充水的离子交换水处理是基本和重要的水处理方法,我单位三个电站均采用这种方法。离子交换树脂失效后必须加碱或加酸进行还原,因此产生大量的酸碱废水,直接外排不但影响环境,而且受到环保部分的监视,造成不必要的损失,直接影响经济效益。引言系统的软件设计
用PCC编制用户程序相对于传统PLC 的一个明显优点是它的多任务处理能力。它非常适合于控制功能复杂、对实时性要求高的设备。整个系统的控制程序采用PL2000 高级语言和LAD(梯形图) 混合编制,根据其不同功能编出独立的程序块,并按实时性要求设定优先级。同时,编程环境中包含丰富的函数库及功能块,大大减轻了开发职员的工作量。
2. 1 温度控制程序
在铝塑复合管生产中,为了增加聚乙烯的活动性、减少挤出机的负荷,希看进步挤出温度;但温度过高,尤其是在挤出机螺杆转速较低、塑料在机筒和模具内停留时间过长会使聚乙烯分子链受到破坏而影响管材质量。PL2000 编程语言提供PIDxh 函数,可以控制多路温度调节。挤出温度采用集中控制,每台挤出机的机筒上有4 个热电偶,机头上有一个热电偶,测温信号直接接在PCC的温度模块上,用PID温控软件实行独立的回路控制。在软件中还采取了自学功能,即自动记录不同时段、不同原料、不同模具下系统所需的参数,并存放于PCC的数据模块中。软件可以自动计算出不同温控所需的PID 参数,温度控制精度可以达到±1 ℃。
2. 2 通讯控制程序
通讯程序是很关键的。在工控机、PCC主站和从站之间以及主站和挤出机的直流调速系统之间、主站与牵引机的变频器之间等都是靠通讯进行数据交换的。工控机、主站和从站之间通过CAN 总线实现通讯。CAN 通讯程序中主要用到下述函数: 用CANopen() 实现CAN 控制器的初始化并申请传输数据所需的资源;用CANwrite() 函数对将被发送的数据进行写操纵;用CANread() 函数进行读取数据的操纵; 用CANdftab() 函数可创建一个包含CAN 总线数据的变量列表,用户可以通过事件变量来进行数据读写;周期性的数据读写则用CANrwtab() 函数进行处理。
使用Frame Driver 编写与直流调速系统和变频器的通讯协议。在图1 中,4 台E590 直流调速系统分别驱动内管挤出、内管涂胶挤出、外管挤出、外管涂胶挤出直流电机,它们均通过主站处理器模块的IF2 口以RS - 422 与PCC通讯,由PCC同一调整控制参数和给定值。5 台Lenze 变频器分别驱动内管牵引、内管涂胶牵引、焊管牵引、铝管牵引和成材牵引的三相交流电动机,它们通过主站接口模块的IF2 口以RS - 485 方式与PCC进行通讯。通讯时先使用函数FRM_ Xopen(enable ,adr (device) ,adr (mode) ,adr (config) ,status ,ident)初始化;发送数据时,先向帧驱动器申请一个缓存区,这时要用到FRM_ gbuf (enable , ident , status , buffer , buflng) 函数;然后将要发送的数据写进申请得到的缓存区中,用strcpy(outbufadr ,“Frame Driver Output Test”) 函数或memcpy() 函数;后命令帧驱动器传输数据,用FRM_writ (enable ,ident ,buffer ,buflng ,status) 函数。
接收数据的过程基本相反。首先通知帧驱动器从接口读一帧数据并把它放在一个缓存区中,使用函数FRM_read (enable ,ident ,status ,buffer ,buflng);然后将数据从缓存区中拷贝到工作区,用memcpy() 函数;后要开释缓存区以便再用,用FRM_rbuf () 函数。由此可见,使用PCC的帧驱动器编写与第三方的通讯程序是很方便的。
2. 3 挤出量控制
挤出量的控制是控制挤出的铝塑复合管内外管的大小。挤出量是按管径和牵引速度用公式计算出来的,以内外管径符合标准、表面光洁为宜。挤出量是由PCC主站处理器上的通讯端口IF2 以RS - 422 与E590直流传动系统通讯,调节直流电机的转速(即挤出机螺杆的转速) 来调整的。
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