发货地址:山西太原杏花岭区
信息编号:233599948,公司编号:23041054
产品规格:不限
产品数量:999.00 个
包装说明:原包装
产品单价:面议
官方网址:http://15340667322.b2b168.com/
FF协议是一种美式的浪漫主义标准,在美国多增加二十美金的成本对于一个控制器或者传感器来说并不是什么大不了的,但对于广大的第三世界国家,短时间内我们是不太可能接受这么贵的解决方案,而且技术上面也存在着很多的理想化,目前也只有H1在使用,H2已完全废弃,改用工业以太网。每当我看到FF后,总让我想起LONWORKS,我应该是国内比较早用LONWORKS开发产品的研发工程师,2000年我们对LON协议充满了好感,特别是它的人化的设计、七层协议的完整实现、基于网络变量的组态方式。但在后来若干年中,我们有一种骑虎难下来感觉。1、LON协议太慢了,一个74K网络中一秒多也不过几十帧;2、协议实现不完整,FT-10A的收发器根本就没有实现P-坚持型载波侦听多路访问协议(P—CSMA),所谓的回避就是减少每一秒钟的发送数据帧数,然后每一帧发三次,这是做了很多实验后再打电话给美国Echelon公司后得到的正式答复“FT-10A不支持LON协议的P—CSMA”;3、LON的芯片3150其实是一颗早期摩托罗拉的三核,这确实为通信能力的提升带来了很多好处,但仍然不是硬件解析的,所以速度相当慢;4、基于LONMARK的组态软件使用户在现场很难维护,更换任一节点后都需要重新组态和配置,并且过程相当麻烦和缓慢(可能现在的电脑速度上会快很多),这在工控现场是不可思议的;
在现场总线这一节的后面我谈一谈对工业以太网的看法,在这个盲目推崇以太网和TCP/IP协议的年代,我要对工业以太网泼冷水,在未来的工业系统中以太网的必要是无可以厚非的,但以太网不是的,它在实现与HMI、监视系统的联接方面有超人的优势,这是因为他可以很方便的提供跨区域跨平台的互操作和访问,特别是基于Web的e设备是未来的一个方向,这使广大厂商都在自己的系统里面上以太网上TCP/IP。这是没有错的,这个方向是相当正确的,但是越来越多的工程师和科技工作者希望用工业以太网一网打净所有需要现场总线的场合,这就不对了。工业以太网是一种商业的办公用网络,它在好多个领域是不适合的,
1、对时间要求高的系统(实时、重复、顺序);
2、对效率要求比较高的系统;
3、对成本要求比较高的系统;
4、对可靠要求高的系统。
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