描述
现场总线是90年代初发展起来的,远程I/O应该采用现场总线,如CAN、LONWORKS、HART总线。在DCS系统中,远程I/O采用HART总线比较多。比如现场的变送器,距离控制器机柜比较远,常把16个变送器来的信号编成一组,用HART总线把信号送到控制器,控制器同时读进16个变送器来的信号。采用现场总线,控制器和变送器两者距离可达1公里以上。
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