远程智能I/O的应用,使过程信号得到就地数字化处理,
从而大大提高了系统的测控精度,另外,抗干扰能力和
可靠性以及环境适应性也得到了提高,
这些推动了现场总线的发展,
加速了现场一次元件的数字化与智能化进程。
智能变送器就是远程智能I/O
与现场一次元件渗透和融合的结果。
1.远程智能I/O的组成及工作原理
远程智能I/O的设计采用DCS
的网络通信技术以及PLC
和单回路控制器的现
场处理控制技术,目的是使DCS系统分散,实现过程
I/O远程化和智能化。远程智能I/O系统一般部分组成:
(1)位于现场的智能前端;
(2)通讯总线;
(3)计算机适配器。智能前端的通道数一般有15~20个。
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