1753-IB16XOB8

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描述

1753-IB16XOB8

故障站的自动脱离和旁路。任何一个节点的故障都不会影响整个网络的通讯畅通，该故障节点应该自动脱离和旁路。一旦故障排除，该节点能够自动恢复整个网络的数据通讯。
通讯处理器和控制处理器分离。在一些系统中，控制处理器和通讯处理器是完全两个独立的处理器，二者各司其职，不存在相互影响，这样即可以确保控制单兀的控制算法的响应速度，同时又可以保证网络通讯的实时性和安全性，避免因网络通讯故障导至控制响应速度变慢或者因控制算法复杂而影响网络的有效传输。
除此之外，采用开放性的网络拓扑结构和通讯协议也是提高整个系统可靠性的重要措施。在早期DCS系统中，由于普通网络系统和通讯协议很难满足要求，许多厂商都开发了专有通讯系统和专用通讯协议，但其最大缺点就是其专用性，厂商之间相互封闭，其可靠性需要厂商自己不断完善和发展，因此导致开发成本很高。随着计算机网络技术的迅猛发展，IEC8802.x，（（与人们熟悉的IEEE802.x标准相对应）系列标准相继推出，通用计算机网络的性能和可靠性不断提高，而价格迅速下降。在这种趋势下，主要DCS厂商都纷纷放弃发展自己独有网络产品的做法，转而采用通用计算机网络结构和相关软硬件产品。在这方面最为典型的例子就是FDDI网络在控制网络中的使用，由于FDDI被设计用于骨干高速网络，与生俱来的双环拓扑结构使其不仅具有冗余特性，而且具有容错特点，即使在双环同时断开时仍然能够维持整个系统的正常通讯，这些FDDI标准特性使得厂商不需要自己单独设计冗余控制网络之间的无扰切换系统。与此同时，由于FDDI网络被设计用于骨干网，因此具有大量标准硬件与常规的以太网和令牌网等互连，从而具有很好的开放性和很高的可靠性。
开放型网络给DCS厂商带来的最大好处就是系统的开放性和可靠性得到显著增强，这是因为通讯领域专业领导厂商的技术力量雄厚，其通讯系统软硬件产品的可靠性和开放性在长期使用中得到了充分验证。通过采用开放型通讯系统，DCS系统提供了不同厂商软硬件产品互操作的可能性，有利于用户在更大范围内自由选择相关产品从而达到更优的性能价格比。最为成功的例子就是现场总线技术的出现和以太网技术在工业控制中的应用。可以说，DCS系统的开放性也逐渐成为一个越来越重要的指标。采用开放型系统还有一个附加好处，那就是有效降低了厂商的研发成本，加速了产品的更新换代。

产品承诺：
保 证 全新原装进口,
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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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Enlarge
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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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