描述
1747-L553
我们已经知道有的FCS是由PLC发展而来，而有的FCS是由DCS发展而来，那么，今天FCS已走向实用化，PLC与DCS前景又将如何。
PLC于60年代末期在美国首先出现，目的是用来取代继电器，执行逻辑、计时、计数等顺序控制功能，建立柔性程序控制系统。1976年正式命名，并给予定义：PLC是一种数字控制专用电子计算机，它使用了可编程序存储器储存指令，执行诸如逻辑、顺序、计时、计数与演算等功能，并通过模拟和数字输入、输出等组件，控制各种机械或工作程序。经过30多年的发展，PLC已十分成熟与完善，并开发了模拟量闭环控制功能。PLC在FCS系统中的地位似乎已被确定并无多少争论。IEC推荐的现场总线控制系统体系结构,PLC作为一个站挂在高速总线上。编者以为，辅助车间的控制系统应以遵循现场总线通讯协议的PLC或能与FCS进行通讯交换信息的PLC为优选对象。
自1973年提出第一台以微处理器为基础的控制器以来，它逐步完善，并最终形成功能齐全、安全可*的数字式分散控制系统DCS。它的性能大大优于以住任何一种控制系统。可以满足火电厂DAS、MCS、SCS和APS各系统的各种要求，目前还可以通过工业以太网建立管理层网络，以满足火电厂呼声越来越高的加强管理的要求。可以这样说，DCS系统的监控可以复盖大型火电机组的工艺全过程。
产品承诺：
保 证 全新原装进口,
保 证 安全准时发货，
保 证售后服务质量，
优势价格，大量现货。
主营DCS系统配件
机器人系统配件
大型伺服系统配件
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