行业分类
1746-NI16I
日期:2014-05-04 11:38  点击:9
 
 
价格:1.00/件
品牌:1746-NI16I
起订:1件
供应:1件
发货:1天内
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1746-NI16I

  dcs和plc的表现的主要差别是在开关量的逻辑解算和模拟量的运算上,即使后来两者相互有些渗透,但是还是有区 别。80年代以后,plc除逻辑运算外,控制回路用的算法功能已经大大加强,但 plc用梯形图编程,模拟量的运算在编程时不太直观,编程比较麻烦。但在解算逻辑方面,表现出快速的优点,在微秒量级,解算1k逻辑程序不到1毫秒。它把 所有的输入都当成开关量来处理,16位(也有32位的)为一个模拟量。而dcs把所有输入都当成模拟量,1位就是开关量。解算一个逻辑是在几百微秒至几毫 秒量级。对于plc解算一个pid运算在几十毫秒,这与dcs的运算时间不相上下。

  在接地电阻方面,对plc也许要求不高,但对dcs一定要在几欧姆以下(通常在4欧姆以下)。模拟量隔离也是非常重要的



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