描述
2711P-T12C4D1A
数字智能现场装置是FCS系统的硬件支撑，是基础，道理很简单，FCS系统执行的是自动控制装置与现场装置之间的双向数字通信现场总线信号制。如果现场装置不遵循统一的总线协议，即相关的通讯规约，不具备数字通信功能，那么所谓双向数字通信只是一句空话，也不能称之为现场总线控制系统。再一点，现场总线的一大特点就是要增加现场一级控制功能。如果现场装置不是多功能智能化的产品，那么现场总线控制系统的特点也就不存在了，所谓简化系统、方便设计、利于维护等优越性也是虚的。
(3) FCS系统的本质是信息处理现场化
对于一个控制系统，无论是采用DCS还是采用现场总线，系统需要处理的信息量至少是一样多的。实际上，采用现场总线后，可以从现场得到更多的信息。现场总线系统的信息量没有减少，甚至增加了，而传输信息的线缆却大大减少了。这就要求一方面要大大提高线缆传输信息的能力，另一方面要让大量信息在现场就地完成处理，减少现场与控制机房之间的信息往返。可以说现场总线的本质就是信息处理的现场化。
减少信息往返是网络设计和系统组态的一条重要原则。减少信息往返常常可带来改善系统响应时间的好处。因此，网络设计时应优先将相互间信息交换量大的节点，放在同一条支路里。
减少信息往返与减少系统的线缆有时会相互矛盾。这时仍应以节省投资为原则来做选择。如果所选择系统的响应时间允许的话，应选节省线缆的方案。如所选系统的响应时间比较紧张，稍微减少一点信息的传输就够用了，那就应选减少信息传输的方案。
现在一些带现场总线的现场仪表本身装了许多功能块，虽然不同产品同种功能块在性能上会稍有差别，但一个网络支路上有许多功能雷同功能块的情况是客观存在的。选用哪一个现场仪表上的功能块，是系统组态要解决的问题。
考虑这个问题的原则是：尽量减少总线上的信息往返。一般可以选择与该功能有关的信息输出最多的那台仪表上的功能块。
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主营DCS系统配件
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