TB840A 3BSE037760R1 ABB

DCS is developed on the basis of operational amplifiers.All the relationships between functions and process variables are made into function blocks(some DCS systems are called extruded blocks).The main difference between the performance of dcs and plc is in the logic calculation of switching quantities and the operation of analog quantities.Even if the two penetrate each other later,there is still a difference.

DCS是在运算放大器的基础上得以发展的。把所有的函数和过程变量之间的关系都做成功能块（有的DCS系统称为膨化块）。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。