1771-HCDOC现货

福州聚福兴自动化有限公司为您提供1771-hcdoc现货。


  老式dcs的问世到现在已经将近30年，在这30年中，计算机技术、网络技术的发展可以说是日新月异，几乎每天有新的产品投放市场。

  ??对于工业控制来说，不管宣称自己的是第几代，但其结构还是相对的。一套至少可以运行15年以上。dcs的控制器、网络、人机界面主要是操作员站三者相比较，人机界面的损坏率要高一些。因为操作员站的硬盘有活动部件，容易出现故障。又如键盘、运行人员的多次操作，crt24小时连续运行都比较容易损坏。另外它的电磁特性决定了其寿命要短一些。在dcs的生命周期中，操作员站一定需要更换一次。如果不更换，运行7~8年的dcs保留它，操作员站故障太多，硬盘、crt购买价格高不说，有时还难以买到。整体扔掉它，几百万的投资化为乌有，就有太可惜的感觉。不仅如此，另外技术进步，用户也需要作操作员站改造。

  ??上世纪90年代以前的dcs，无论是操作员站、控制器，还是网络的硬件和，三者都是由dcs厂家自己的，也就是说都是-的。操作员站的显示、数据库和驱动也没有设计成模块，显示和对控制器的驱动是交叉在一起的。由于某些被控对象需要控制和显示的标签很多，一个300mw的电厂达到8000多个标签。原来设计的操作员站主机无论从cpu的运算速度和存储器的存储容量都不能需要。如果自己设计操作员主机的话，投资太多，二是设计完成以后不一定能要求。原来标签量少的时候，自己设计的主机能够工作，与操作员站连接采用串行口。后来标签量大了，串行连接不行了。90年代以后，一些厂家的dcs操作员站的主机开始采用通用机，如sun，dec的小型机。dcs网络接口与操作员站的连接采用scsismall computer system interface总线。从接口到操作员站主机的传输速度大大。

 

1771-hcdoc现货

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