电化 一三八50一八六09二
初期交通隧道的设计都偏重于现场总线与以太网混合的复杂通讯结构设计,一方面程序设计人员在现场有较大的软硬件调试工作量,一方面也增加了整个系统数据的采集难度。在中控室中并未设计到其它子系统与实时监控系统之间的整合问题,相互之间都是***的。将车检器与LED大屏都考虑至现场以 PLC的通讯来解决数据采集与控制问题,实际所得到的验证是不可靠、不灵活的,车检数据的采集、转发与存储利用PLC的通讯方式很难取到较为准确的统计数据,以及LED大屏显示常常要以ascii 码的方式写一些天气或致词方面的汉字,由目前的常用的PLC是不能实现的,只能以调用已经建立好的文字列表,以通讯协议方式来切换内容的列表号,而不能灵活的进行汉字的输入。 2、初始硬件通讯结构设计决定了上位软件所发挥的作用较为有限,随着实际工程的验证后,目前的通讯网络结构已经有了较大提升。
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NEW ABB YGBF-20 FIELD EXCITER 64G069D-0001 CONVERTER B404880
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