1746-IO12DC
1746-IO12DC
如果所要完成的回路太多,如一个控制器采集几千点、完成几百个回路的运算,危险又太集中。在这种情况下,危险必需分散。随着计算机技术的发展,计算机的运算能力、存储容量和可靠性不断提高,一台计算机所完成的任务也可以增加。完成的任务也可集中一点。另外,控制器、网络等冗余技术也得到了发展,控制运算也可集中一些。
从目前的DCS来看,一个控制器完成几十个回路的运算和几百点的采集、再加适量的逻辑运算,经现场使用,效果是比较好的。这就产生控制器升级的问题了。有时控制器和检测元件的距离还是比较远,这就促进现场总线的发展。如CAN、LOONWORKS、FF等现场总线,以及HART协议接收板等都用到 DCS系统中。
现货,现货,降降降,火火火,火火火……
现货,现货,降降降,火火火,火火火……
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