CIMR-M5N2015

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描述

CIMR-M5N2015

合理选择PLC，对于提高PLC在控制系统中的应用有着重要作用。本文就PLC的机型、I/O、存储器类型及容量和编程器、外部设备几个方面来说明选择PLC应该考虑的因素，并给出了两个PLC应用的实例。文章中尽管归纳了一些选用PLC的方法，但在实际工作中还一定要依据实际情况做出适当的调整，以便设计出满足期望的工业控制系统。
    随着PLC在工业控制中的推广普及，PLC产品的种类越来越多，其结构型号、性能、容量、指令系统、编程方法等各不相同，适用场合也各有侧重。因此，合理选择PLC，对于提高PLC在控制系统中的应用有着重要作用。
    一、机型的选择
    我国市场上流行的有如下几家PLC产品：
    1．施耐德公司，包括早期天津仪表厂引进莫迪康公司的产品，目前有Quantum、Premium、Momentum等产品；
    2．罗克韦尔公司（包括AB公司）PLC产品，目前有SLC、MicroLogix、ControlLogix等产品；
    3．西门子公司的产品，目前有SIMATICS7-400/300/200系列产品；
    4．GE公司的产品；
    5．日本欧姆龙、三菱、富士、松下等公司产品，其中使用较多的是三菱公司F1、F2、FX2等系列产品。
    PLC机型选择的基本原则是：在功能满足要求的前提下，选择最可靠、维护使用最方便以及性能价格比最优的机型。通常做法是，在工艺过程比较固定、环境条件较好的场合，建议选用整体式结构的PLC；其他情况则最好选用模块式结构的PLC；对于开关量控制以及以开关量控制为主、带少量模拟量控制的工程项目中，一般其控制速度无须考虑，因此，选用带A/D转换、D/A转换、加减运算、数据传送功能的低档机就能满足要求；而在控制比较复杂，控制功能要求比较高的工程项目中（如要实现PID运算、闭环控制、通信联网等），可视控制规模及复杂程度来选用中档或高档机（其中高档机主要用于大规模过程控制、全PLC的分布式控制系统以及整个工厂的自动化等）。根据不同的应用对象，表1列出了PLC的几种功能选择。

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Parker RAS-600-S4 RAS600S4 RAS600S Pressure Valve USED

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Parker Schrader Bellows Pressure Regulator 3568-2000

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Parker 621B-6 Pressure Control Valve 621B6 USED

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Parker 035682000B Pressure Regulator

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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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