前言微型计算机在生产过程控制应用中,通过模拟量输出通道控制执行机构,一般都要求有自动/手动切换装置,同时还要求此通道能进行增量式调节。这样,一旦失去主机控制时,能实现在原先自动控制的基础上平滑过渡到手动控制。本文介绍一种用 CPU 控制 Preface Microprocessor in the production process control applications, through the analog output channel control actuator, generally require automatic / manual switching device, but also requires that the channel can be adjusted incrementally. In this way, once the host control is lost, smooth transition to manual control based on the original automatic control can be achieved. This article describes a CPU control