2711P-T10C4D8

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描述

2711P-T10C4D8

在计算机控制系统出现以后,工程实践中广泛使用模拟仪表系统中的传感器、变送器和执行机构。其信号传送一般采用4-20mA的电流信号形式,一个变送器或执行机构需要一对传输线来单向传送一个模拟信号。这种传输方法使用的导线多,现场安装及调试的工作量大,投资高,传输精度和抗干扰能力较低,不便维护。主控室的工作人员无法了解现场仪表的实际情况,不能对其进行参数调整和故障诊断,所以处于最底层的模拟变送器和执行机构成了计算机控制系统中最薄弱的环节,即所谓DCS系统的发展瓶颈。现场总线正是在这种情况下应运而生。现场总线技术是在80年代后期发展起来的一种先进的现场工业控制技术,它综合了数字通信技术、计算机技术、自动控制技术、网络技术和智能仪表等多种技术手段,从根本上突破了传统的“点对点”式的模拟信号或数字一模拟信号控制的局限性,构成一种全分散、全数字化、智能、双向、互连、多变量、多接点的通信与控制系统。现场总线则是连接智能现场设备和自动化系统的数字式、双向传输、多分支结构的通信网络,其基础是智能仪表。分散在各个工业现场的智能仪表通过数字现场总线连为一体,并与控制室中的控制器和监视器一起共同构成现场总线控制系统(Fieldbus Control System,FCS)。通过遵循一定的国际标准,可以将不同厂商的现场总线产品集成在同一套FCS中,具有互换性和互操作性。FCS把传统DCS的控制功能进一步下放到现场智能仪表,由现场智能仪表完成数据采集、数据处理、控制运算和数据输出等功能。现场仪表的数据(包括采集的数据和诊断数据)通过现场总线传到控制室的控制设备上,控制室的控制设备用来监视各个现场仪表的运行状态,保存各智能仪表上传的数据,同时完成少量现场仪表无法完成的高级控制功能。另外,FCS还可通过网关和企业的上级管理网络相连,以便企业管理者掌握第一手资料,为决策提供依据。所以现场总线具有以下突出特点:

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主营DCS系统配件
机器人系统配件
大型伺服系统配件
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Triconex Siemens Yaskawa ABB GE Ovation AB Foxboro Motorola Schneider XYCOM KUKA
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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。