MC4/11/03/400

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描述

MC4/11/03/400

在DCS控制系统中至少存在2个网络，一个是管理层和控制层之间的通信网络，另一个是过程控制层与底层I/O卡件层之间的485通信网络。上层网络主要的作用是实现管理层对控制层实时检测，和对下层控制器的配置设置等任务。下层网络是为了把I/O卡件采集的数据传送到过程控制层，然后把控制层的控制数据传送给I/O卡件。这2个网络在DCS控制系统中的重要性是不言而喻的。
    针对上层网络模块的冗余，当今的工业自动化领域出现了各种各样的支持链路冗余功能的工业以太网交换机，它们解决了由节点故障导致网络瘫痪的问题。为提高数据通信的整体可靠性和容错性，本DCS控制系统也采用环形的网络拓补结构。但是由于环形网本身固有的缺点是节点故障引起全网故障，因此数据通信链路的冗余技术应运而生。为了保证2层网络的顺利工作，2个网络都采用1∶1的冗余设置。分布处理单元检测到主网出现故障时，自动放弃从主网的端口通信，同时启用冗余网的端口，将数据转由冗余网发送和接受。此时冗余网进入数据通信状态，主网及时进行修补。双环网技术实现了传输媒介的冗余，在TurboRing的基础上进一步提高了系统的可靠性。但双环网的管理和切换都比较复杂，本系统采用了一种简单的方法。

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Leybold Mag W-1300-CT Turbo Pump, Vacuum Pump, Endura

Leybold TW 700 Vacuum Turbo Pump: Factory Rebuild

INVINCIBLE 15 HP VACUUM PUMP TURBO FLOW TOSHIBA

EBARA ET-2500WS Turbo Vacuum Pump, 2500 WS, Surplus New

Varian TV 551 MacroTorr Turbo Vacuum Pump Rebuilt

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Edwards EXT 250M Vacuum Turbo Pump 250: Surplus New

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2 PFEIFFER BALZERS Turbo Vacuum Pumps/Control Units NOS

Leybold Turbovac 1000C Turbo Vacuum Pump 6″ ASA

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LEYBOLD TURBOVAC 1000C TURBO VACUUM PUMP, NT20

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LEYBOLD VACUUM TURBO PUMP MAG400 w/cable+nt340 power

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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。

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