SDCS-CON2B

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描述

SDCS-CON2B

基于ARM的分布处理单元的结构框图见图2,这和一般的分布处理单元的结构非常相似。这里主要把处理单元分为6部分:ARM控制器、上层网络模块、电源管理模块、存储器模块、低层网络模块和时钟模块。ARM控制器和存储模块组成了最基本的嵌入式系统,整个DCS控制系统的数据处理和控制策略都是在这里处理的。上层网络模块主要是指和管理层通信的主/冗余网络和一个实现主/冗余分布处理单元进行数据交换的网络,这部分的主要功能是完成管理层对DCS控制系统的实时检测和实现主/冗余分布处理单元的数据冗余。底层的网络模块是由分为主次的2条485网络组成,此模块主要实现ARM控制器的I/O卡件之间的数据通信。存储器模块可分为两部分,一部分用来管理存放操作系统,另一部分用来管理存放实时数据。电源模块和时钟模块分别实现电源的管理和时钟的管理。冗余分布处理单元的工作原理:两个分布处理单元硬件配置完全相同,内部装有相同的操作系统,相同的组态软件,相同的组态信息。在同一时刻只有1个分布处理单元通过双机交换卡接受过程信息并进行运算处理,最后产生控制结构去控制过程设备,此分布处理单元称为主分布处理单元。同时冗余分布处理单元并没有闲置,它在每一个工作周期都通过双机之间的光纤对主分布处理单元所接受的过程信息和运算结果进行实时拷贝,这样冗余分布处理单元始终与主分布处理单元同步。冗余分布处理单元同时检测拷贝的信息是否完整,是否在所允许的容错度内。一旦信息不完整或报错,则说明主分布处理单元工作不正常。在这种情况下,冗余分布处理单元通过光纤将主分布处理单元旁路,同时切换为主分布处理单元继续工作。切换时间选用最短的运算周期(几十ms或更短),从而实现无扰动切换。等到主分布处理单元恢复正常后,冗余分布处理单元自动把控制权交还给主分布处理单元,转为冗余备份状态。

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主营DCS系统配件
机器人系统配件
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选择深圳长欣,选择放心,售后无忧大量现货,当天顺丰发货!
主营:本特利,英维思,伍德沃德,福克斯波罗、西屋、瑞恩、施耐德莫迪康、ABB、AB、西门子、摩托罗拉、GE发那科、安川、博世力士乐,ACSO,力士乐等各大品牌的DCS系统配件,机器人系统配件,大型伺服系统备件。

先介绍几点经验。
1、先通读一遍“系统手册”(不管能不能看懂,先了解个大概,以便学习编程时查找);
2、由位控逻辑入手,逐渐增加定时、计数等条件,把或、与、非关系理顺;
3、进而练习整数运算、实数运算、类型转换;
4、量程转换、PID调节回路的建立及P、I、D参数的理解(最好是有个物理回路验证,比如变频器+电机+测速传感器);
5、循环、顺序、跳转等程序控制(尽量避免跳转,非跳不可时也是跳的越近越好);
6、中断、通讯、位置控制....

本人以ABB工业机器人配件DSQC系列和Motorola MVME系列,GE 卡件 模块 驱动器系列为主攻。各位电工朋友可根据自己的条件选择适合自己的PLC品牌,由于PLC的基本框架大同小异,学会一种至于其它的学习起来也就简单了。