UTNH23A 光纤共享集线器 通信技术和编程技术的发展

TOSHIBA UTNH23A 光纤共享集线器

TOSHIBA UTNH23A质量***格实惠有多种型号。光纤共享集线器单元UTNH系列在此称为光纤共享集线器单元手动构成了TC-net 100光传输线路。它采用了一个有8个端口的MT- RJ光学连接器。集线器单元还有-个用于RJ-45模块连接器的端口，可以是连接TCnet100双绞线设备。在使用单个单元时，使用光学线路A传输线UTNH23A为TC-net 100安装的SNMP的共享集线器单元或B线传输线路UTNH23B的光共享集线器单元。外部视图和系统配置示例如下所示。UTNH23A:用于线路A传输线路SNMP的主光纤共享集线器单元已安装utnh 23b:B线传输线路的主光纤共享集线器单元。

值得注意的是PLC和DCS这些原来处于不同硬件平台的系统，正随着计算技术、通信技术和编程技术的发展，趋向于建立同一硬件平台，运用同一个操作系统、同一个编程系统，执行不同的DCS和PLC功能。这就是真正意义上的EIC三电一体化。或者说DCS和PLC的形态将会变化，而它们的功能依然存在。其中的关键技术应该是嵌入式PC系统及支持现场总线的I/O 硬件 ，以及以IEC 61161-3为基础的编程系统及强实时操作系统。

在中国，大约从1974、75年在北京和上海开始开发采用位片式微处理芯片的可编程顺序控制器，并有所应用。但一直未能形成批量生产。在改革开放刚起步的1979年，在当时的机械部仪表局的推动下，开始从美国MODICON引进起584的PLC，并首先在电站的辅机如输煤、除灰除渣、水处理系统以及水泥厂等控制系统中成功应用，从而大大推动了PLC在我国工业的大规模运用。遗憾的是，花了很大一笔外汇的这个项目并不曾形成良性的有后续的发展。

TOSHIBA UTNH23A has multiple models with high quality and affordable prices. The UTNH series of fiber optic shared hub units is referred to here as fiber optic shared hub units, which manually form the TC-net 100 optical transmission line. It uses an MT-RJ optical connector with 8 ports. The hub unit also has a port for RJ-45 module connectors, which can be used to connect TCnet100 twisted pair devices. When using a single unit, use the shared hub unit for SNMP installed on TC net 100 using optical line A transmission line UTNH23A or the optical shared hub unit for B-line transmission line UTNH23B. The external view and system configuration examples are shown below. UTNH23A: The main fiber optic shared hub unit for SNMP transmission line A has been installed for UTNH 23b: B line transmission line.

It is worth noting that systems such as PLC and DCS, which were originally located on different hardware platforms, are tending to establish the same hardware platform with the development of computing technology, communication technology, and programming technology, using the same operating system and programming system to perform different DCS and PLC functions. This is the true EIC three electric integration. Or rather, the form of DCS and PLC will change, while their functions still exist. The key technologies should be embedded PC systems and I/O hardware that supports fieldbus, as well as programming systems and strong real-time operating systems based on IEC 61161-3.

In China, the development and application of programmable sequential controllers using bit chip microprocessors began around 1974 and 1975 in Beijing and Shanghai. But it has not been able to form mass production. In 1979, at the beginning of the reform and opening up, with the promotion of the Instrument Bureau of the Ministry of Machinery at that time, the 584 PLC was introduced from MODICON in the United States. It was first successfully applied in auxiliary equipment such as coal transportation, ash and slag removal, water treatment systems, and cement plants in power plants, thus greatly promoting the large-scale application of PLC in China&＃39;s industry. Unfortunately, this project, which cost a significant amount of foreign exchange, did not have a positive development in the future.