描述
功能块的总成称为功能块库。DCS的控制器主要是由CPU、ROM、RAM、E2PROM、地址设定开关等组成。CPU完成运算，ROM用来存操作系统、功能块库，功能块在ROM中的排列是确定的，用户是不能改变的。RAM用来存CPU的运算结果和I/O信号。E2PROM存用功能块连成的控制方案。
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