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DCS它可以控制和监视工艺全过程，对自身进行诊断、维护和组态。但是，由于自身的致命弱点，其I/O信号采用传统的模拟量信号，因此，它无法在DCS工程师站上对现场仪表（含变送器、执行器等）进行远方诊断、维护和组态。FCS采用全数字化技术，数字智能现场装置发送多变量信息，而不仅仅是单变量信息，并且还具备检测信息差错的功能。FCS采用的是双向数字通讯现场总线信号制。因此，它可以对现场装置（含变送器、执行机构等）进行远方诊断、维护和组态。FCS的这点优越性是DCS无法相比的。

 

（6）FCS由于信息处理现场化，与DCS相比可以省往相当数目的隔离器、端子柜、I/O终端、I/O卡件、I/O文件及I/O柜，同时也节省了I/O装置及装置室的空间与占地面积。有专家以为可以省往60%。

 

（7）与（6）同样理由，FCS可以减少大量电缆与敷设电缆用的桥架等，同时也节省了设计、安装和维护用度。有专家以为可以节省66%。

 

对于（6）、（7）两点应补充说明的是，采用FCS系统，节省投资的效果是不用怀疑的，但是否如有的专家所说达60~66%。这些数字在多篇文章中出现，编者以为这是相互转摘的结果，目前还未找到这些数字的原始出处，因此，读者在引用这些数字时要慎重。

 

（8）FCS相对于DCS组态简单，由于结构、性能标准化，便于安装、运行、维护。

 

（9）用于过程控制的FCS设计开发要点。这一点并不作为与DCS的比较，只是说明用于过程控制或者说用于模拟连续过程类的FCS在设计开发中应重点考虑的题目。

 

1）要求总线本安防爆功能，而且是头等重要的。

2）基本监控如流量、料位、温度、压力等的变化是缓慢的，而且还有滞后效应，因此，节点监控并不需要快电子学的响应时间，但要求有复杂的模拟量处理能力。这一物理特征决定了系统基本上多采用主一从之间的集中轮询制，这在技术上是公道的，在经济上是有利的。

3）流量、料位、温度、压力等参数的丈量，其物理原理是古典的，但传感器、变送器及控制器应向数字智能化发展。

4）作为针对连续过程类及其仪器仪表而开发的FCS，应侧重于低速总线H1的设计完善。

 

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