Thermo D-37520

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描述

Thermo D-37520

PROFIBUS通信规程采用了统一的介质存取协议，此协议由OSI参考模型的第二层来实现。在PROFIBUS协议设计时充分考虑了满足介质存取控制的两个要求，即：在主站间通信时，必须保证在分配的时间间隔内，每个主站都有足够的时间来完成它的通信任务，在PLC与从站（PLC或其他设备）间通信时，必须快速、简捷地完成循环，进行实时的数据传输。为此，PROFIBUS提供了两种基本的介质存取控制：令牌传递方式和主/从方式。
    令牌传递方式可以保证每个主站在事先规定的时间间隔内都能获得总线的控制权。令牌是一种特殊的报文，它在主站之间传递着总线控制权，每个主站均能按次序获得一次令牌，传递的次序是按地址升序进行的。
    主/从方式允许主站在获得总线控制权时，可以与从站通信，每发送或获得信息。
    主站要发出信息，必须持有令牌。假设有一个由3个主站和7个从站构成的PROFIBUS系统。3个主站构成了一个令牌传递的逻辑环，在这个环中，令牌按照系统预先确定的地址升序从一个主站传递给下一个主站。当一个主站得到了令牌后，它就能在一定的时间间隔内执行该主站的任务，可以按照主/从关系与所有从站通信，也可以按照主/主关系与所有主站通信。在总线系统建立的初期阶段，主站的介质存取控制(MAC)的任务是决定总线上的站点分配并建立令牌逻辑环。在总线的运行期间，损坏的或断开的主站必须从环中撤除，新接入的主站必须加入逻辑环。MAC的其他任务是检测传输介质和收发器是否损坏，检查站点地址是否出错，以及令牌是否丢失或有多个令牌。
    PROFIBUS的第二层按照国际标准IEC870-5-1的规定，通过使用特殊的起始位和结束位、无间距字节异步传输及奇偶校验来保证传输数据的安全。PROFIBUS第二层按照非连接的模式操作，除了提供点对点通信功能外，还提供多点通信的功能，即广播通信和有选择的广播、组播。所谓广播通信，即主站向所有站点（主站和从站）发送信息，不要求回答。所谓有选择的广播、组播是指主站向一组站点（从站）。

产品承诺：
保 证 全新原装进口,
保 证 安全准时发货，
保 证售后服务质量，
优势价格，大量现货。

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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PLC模块，可编程控制器，CPU模块，IO模块，AI模块，通讯模块。AB/施耐德/ABB/GE/本特利/西屋/英维斯/霍尼韦尔/黑马/FU克斯波罗

15天包退换 一年质保 大量现货  国内实力库存商家


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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