KJ2231X1-EA1 SIS继电器模块

I/O总线，它把多种I/O信号送到控制器，由控制器读取I/O信号。这称为I/O总线。I/O板相互之间并不交换数据。I/O总线的速率是不高的。从几十K到几兆不等。这与计算机技术的发展情况有关。80年代初是20K，80年代中期是40K、80年代末期是80K，90年代是几兆。为了快速，**好是并行总线。采用并行总线，其I/O模件必需与控制器模件相邻。采用串行总线的情况下，I/O板和控制器之间的距离也要比较近才行。**好把控制器模件和I/O模件装在一个机柜内或相邻的机柜内。远程I/O应该采用现场总线。如CAN、LONWORKS、HART总线等。现场总线是90年代初发展起来的。在I/O板中从硬件来说应该有能接收现场总线来的信号的输入、输出板。从软件来说在控制器中应该有读取和写到现场总线信号的功能块。在DCS系统中，远程

公司聯络人：郑娟萍(销售工程师)

Tel：0592-5173279

Fax：0592-5165561

QQ：2773734088

　第二级网络是控制器之间的通讯，把完成不同任务的三种控制器连在一条总线上，称为控制总线。在控制总线上的不同控制器的数量不受限制。在这一条总线上除三种不同的控制器模件以外，还有DCS网络的接口模件。在控制总线上，控制器之间可以调用数据。使得模拟量和开关量之间的结合很好。控制总线不是每一种DCS系统都有的，可以把各种控制器分别连到DCS网络上。控制器之间的数据调用要通过DCS网络。控制总线的速率情况与I/O总线的情况相类似。通常是几十K到几兆之间。当CPU和存储器的能力比较强时，把开关量的逻辑运算和模拟量的采集功能都在一个控制器中完成。在控制总线上就只有一种形式的控制器。其协议采用载波监听，广播发送，类似以太网的协议。 

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