1753-IB16
1753-IB16
--现代的DCS和PLC的区别已越来越小。DCS处理连续量和开关量的能力都很强。PLC处理连续量的能力也越来越大,大型PLC系统结构上也是分布式的。
--顺便介绍一个SCADA系统,这个概念发源于电力行业,也是从系统功能上定义的概念。也就是我国最早所说的”三遥系统(遥侧,遥信,遥控)“。最初的系统是晶体管的。现代的SCADA系统则都是计算机化的。用DCS或PLC也可以组成具有SCADA功能的系统。
DCS的基本结构和PLC的区别
DCS为分散控制系统的英文(TOTAL DISTRIBUTED ConTROL SYSTEM)简称。指的是控制危险分散、管理和显示集中。60年代末有人研制了作逻辑运算的可编程序控制器(Programmable Logic Controller)。简称PLC。主要应用于汽车制造业。70年代中期以完成模拟量控制的DCS推向市场,代替以PID运算为主的模拟仪表控制。首先提出DCS这样一种思想的是原制造仪表的厂商,当时主要应用于化工行业。后又有计算机行业从事DCS的开发。
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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ACCURAY 086266-001 SYS C SCANNER VME ConTROL BOARD CARD
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